Table of Contents - GitHub Pages · Getting Started Downloading the Distribution If you are using...

1.1

1.2

1.3

1.3.1

1.4

1.4.1

1.4.2

1.5

1.5.1

1.5.2

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

2.10

2.11

3.1

3.2

3.3

3.4

3.5

4.1

4.2

4.3

TableofContentsIntroduction

WhyMap?

GettingStarted

Usage

MappingsviaXML

viaAnnotations

viaAPI

Configuration

ConfigurationviaXML

ConfigurationviaAPI

DozermappingconceptsMappingClasses

BasicPropertyMapping

InheritanceMapping

ContextBasedMapping

One-WayMapping

CopyingByObjectReference

DeepPropertyMapping

IndexedPropertyMapping

ExcludingFields

AssemblerPattern

Mappingimmutabletypes

Howdoimapatypeof…?Enums

StringtoDate

CollectionsandArrays

MapBackedPropertyMapping

ProxyObjects

Whatifineedtocustomisethemapping?CustomConverters

CustomBeanFactories

CustomCreateMethods

1

4.4

4.5

5.1

5.2

5.3

6.1

6.2

6.3

7.1

7.2

8.1

8.2

8.3

8.4

9.1

9.2

9.3

10.1

10.2

10.2.1

10.2.2

Customget()set()Methods

ExpressionLanguage

ExtraLogging

EventListening

MetadataQueryInterface

3rdPartySpringIntegration

SpringBootIntegration

JAXB

OtherFAQ

Examples

Migrationv5tov6

v6.0.0tov6.1.0

v6.1.0tov6.2.0

v6.2.0tov6.3.0

SchemaMappingXSD

Spring4XSD

User’sGuidePDF

EclipsePluginInstallation

Usage

viaXML

viaEditor

2

https://dozermapper.github.io/schema/bean-mapping.xsd

https://dozermapper.github.io/schema/dozer-spring.xsd

https://dozermapper.github.io/user-guide.pdf

Dozer

WhatisDozer?DozerisaJavaBeantoJavaBeanmapperthatrecursivelycopiesdatafromoneobjecttoanother.Typically,theseJavaBeanswillbeofdifferentcomplextypes.

Dozersupportssimplepropertymapping,complextypemapping,bi-directionalmapping,implicit-explicitmapping,aswellasrecursivemapping.Thisincludesmappingcollectionattributesthatalsoneedmmappingattheelementlevel.

PleasereadtheaboutpagefordetailedinformationonDozer.

Introduction

4

WhyMap?Amappingframeworkisusefulinalayeredarchitecturewhereyouarecreatinglayersofabstractionbyencapsulatingchangestoparticulardataobjectsvs.propagatingtheseobjectstootherlayers(i.e.externalservicedataobjects,domainobjects,datatransferobjects,internalservicedataobjects).AmappingframeworkisidealforusingwithinMappertypeclassesthatareresponsibleformappingdatafromonedataobjecttoanother.

Fordistributedsystems,asideeffectisthepassingofdomainobjectsbetweendifferentsystems.Typically,youwon’twantinternaldomainobjectsexposedexternallyandwon’tallowforexternaldomainobjectstobleedintoyoursystem.

Mappingbetweendataobjectshasbeentraditionallyaddressedbyhandcodingvalueobjectassemblers(orconverters)thatcopydatabetweentheobjects.Mostprogrammerswilldevelopsomesortofcustommappingframeworkandspendcountlesshoursandthousandsoflinesofcodemappingtoandfromtheirdifferentdataobject.

Agenericmappingframeworksolvestheseproblems.Dozerisanopensourcemappingframeworkthatisrobust,generic,flexible,reusable,andconfigurable.

Dataobjectmappingisanimportantpartoflayeredserviceorientedarchitectures.Pickandchoosethelayersyouusemappingcarefully.Donotgooverboardasthereismaintenanceandperformancecostsassociatedwithmappingdataobjectsbetweenlayers.

ParallelObjectHierarchies

Therecouldbedifferentreasonsofwhyapplicationshouldsupportparallelobjecthierarhchies.Tonameafew:

IntegrationwithExternalCode

SerializationRequirements

FrameworkIntegration

SeparationofArchitecturalLayers

Insomecasesitisefficienttoguardyourcodebasefromfrequentlychangingobjecthierarchy,whichyoudonotcontroldirectly.InthiscaseDozerservesasabridgebetweenapplicationandexternalobjects.AsmappingisperformedinreflectivemannernotallchangesbreakyourAPI.ForexampleifobjectchangesfromNumbertoStringthecodewillkeepworkingasthisisresolvedautomatically.

SomeframeworksimposeSerializationconstraints,whichdoesnotallowsendinganyJavaobjectsthroughthewire.OneofthepopularexamplesisGoogleWebToolkit(GWT)framework,whichrestrictsdevelopertosendingonlyobjectscompiledtoJavaScriptandmarkedasSerializable.DozerhelpstoconvertRichDomainModeltoPresentationModel,whichsatisfiesGWTserializationrequirements.

DozerintegratesnicelywithframeworksuseJAXBimplementations.Withhelpofprovidedfactoryclasses,conversionbetweendomainmodelandXmlobjectsisdefinedinthesamewayasplainobjecttoobjectmappings.

Incomplexenterpriseapplicationitisoftenvaluabletoseparatedesigntoseveralarchitecturallayers.Eachofthemwouldresideonitsownabstractionlevel.Atypicalsimplifiedexamplewouldbepresentation,domainandpersistencelayers.EachofthislayerscouldhaveownsetofJavaBeansrepresentingdatarelevantforthislayer.Itisnotnecessarythatalldatawilltraveltotheupperlevelsofarchitecture.Forexamplethesamedomainobjectcouldhavedifferentmappingsdependantofthepresentationlayerrequirements.

WhyMap?

5

WhyMap?

6

GettingStarted

DownloadingtheDistribution

IfyouareusingApacheMaven,simplycopy-pastethisdependencytoyourproject.

<dependency><groupId>com.github.dozermapper</groupId><artifactId>dozer-core</artifactId><version>6.4.0</version></dependency>

1stMapping

Foryourfirstmapping,letsassumethatthetwodataobjectsshareallcommonattributenames.

Mappermapper=DozerBeanMapperBuilder.buildDefault();DestinationObjectdestObject=mapper.map(sourceObject,DestinationObject.class);

AfterperformingtheDozermapping,theresultwillbeanewinstanceofthedestinationobjectthatcontainsvaluesforallfieldsthathavethesamefieldnameasthesourceobject.Ifanyofthemappedattributesareofdifferentdatatypes,theDozermappingenginewillautomaticallyperformdatatypeconversion.AtthispointyouhavecompletedyourfirstDozermapping.Latersectionswillgooverhowtospecifycustommappingsviacustomxmlfiles.

IMPORTANT:Forreal-worldapplicationsitisNOTrecommendedtocreateanewinstanceoftheMappereachtimeyoumapobjectsbutreusecreatedinstanceinstead.

SpecifyingCustomMappingsviaXML

Ifthetwodifferenttypesofdataobjectsthatyouaremappingcontainanyfieldsthatdon’tshareacommonpropertyname,youwillneedtoaddaclassmappingentrytoyourcustommappingxmlfile.ThesemappingsxmlfilesareusedatruntimebytheDozermappingengine.

Dozerautomaticallyperformsanytypeconversionwhencopyingthesourcefielddatatothedestinationfield.TheDozermappingengineisbi-directional,soifyouwantedtomapthedestinationobjecttothesourceobject,youdonotneedtoaddanotherclassmappingtothexmlfile.

IMPORTANT:Fieldsthatareofthesamenamedonotneedtobespecifiedinthemappingxmlfile.Dozerautomaticallymapsallfieldswiththesamepropertynamefromthesourceobjectintothedestinationobject.

i.e.:

<mapping><class-a>yourpackage.yourSourceClassName</class-a><class-b>yourpackage.yourDestinationClassName</class-b><field><a>yourSourceFieldName</a>yourDestinationFieldName</field></mapping>

ThecompleteDozermappingxmlfilewouldlooklikethefollowing.TheCustomMappingssectioncontainsmoreinformationonmappingoptionsthatareavailabletoyouformorecomplexusecases.

GettingStarted

7

https://maven.apache.org/

<?xmlversion="1.0"encoding="UTF-8"?><mappingsxmlns="http://dozermapper.github.io/schema/bean-mapping"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://dozermapper.github.io/schema/bean-mappinghttp://dozermapper.github.io/schema/bean-mapping.xsd"><configuration><stop-on-errors>true</stop-on-errors><date-format>MM/dd/yyyyHH:mm</date-format><wildcard>true</wildcard></configuration><mapping><class-a>yourpackage.yourSourceClassName</class-a><class-b>yourpackage.yourDestinationClassName</class-b><field><A>yourSourceFieldName</A>yourDestinationFieldName</field></mapping></mappings>

DozerandDependencyInjectionFrameworks

DozerisnotdependantofanyexistingDependencyInjectionframework(DI).Howeverthegeneralaimistosupportthemosttypicalusecaseswithready-to-usewrappers.CheckSpringIntegrationmanualforoptionofinitializingDozerincontextofSpringDIframework.

GettingStarted

8

https://en.wikipedia.org/wiki/Dependency_injection

Usage

DozerBeanMapper

Beforewegooversettingupcustomxmlbeanmappings,letuslookatasimpleexampleofusingDozer.TheDozermappingimplementationhasamethodcalledmapwhichtakesasourceobjectandeitheradestinationobjectordestinationobjectclasstype.Aftermappingthetwoobjectsitthenreturnsthedestinationobjectwithallofitsmappedfields.

Mappermapper=DozerBeanMapperBuilder.buildDefault();DestinationObjectdestObject=mapper.map(sourceObject,DestinationObject.class);

Or…

DestinationObjectdestObject=newDestinationObject();mapper.map(sourceObject,destObject);

Dozeroperatesintwogeneralmodes:implicitandexplicit.

Implicitmodeisactivatedbydefaultandtriestoresolvemappingsforyou.Itusessimpleassumptionsthatiftwoobjectsarepassedformappingthenbeanpropertieswiththesamenamesshouldbemapped.Ifthereareadditionalmappingsneeded,whichcannotbederivedbythenamingyoushouldaddthoseeitherviaXML,annotationsorAPI.

Explicitmodeassumesthatnomappingsshouldbeperformedor"guessed"untilyouhavespecifiedthosespecifically.Theamountofcodingishigherinexplicitmode,butsometimesyouwouldliketohavefullcontrolonwhatisgoingonduringthemappingsprocessandthisapproachisalsousedinmanyoftheproductiveapplications.Implicit/Explicitmappingswitchiscalled"wildcard"inDozer.

InjectingCustomMappingFiles

TheDozermappingxmlfile(s)defineanycustommappingsthatcan’tbeautomaticallyperformedbytheDozermappingengine.AnycustomDozermappingfilesneedtobeinjectedintotheMapperimplementationviaDozerBeanMapperBuilder#withMappingFiles(..)method.

Preferably,youwillbeusinganIOCframeworksuchasSpringfortheseDozerinjectionrequirements.Alternatively,theinjectionofmappingfilescanbedoneprogrammatically.Belowisaprogrammaticapproachtocreatingabeanmapper.NotethatthisisNOTtherecommendedwaytoretrievethebeanmapper.Eachnewinstanceneedstobeinitializedandthisconsumestimeaswellasresources.Ifyouareusingthemapperthiswayjustwrapitusingthesingletonpattern.

Mappermapper=DozerBeanMapperBuilder.create().withMappingFiles("dozerBeanMapping.xml","someOtherDozerBeanMappings.xml").build();

DestinationObjectdestObject=mapper.map(sourceObject,DestinationObject.class);

SpringIntegration

ThefollowingisanexamplehowtheMapperbeanwouldbeconfiguredviaSpring.

<beanid="mapper"class="com.github.dozermapper.core.DozerBeanMapper"><propertyname="mappingFiles"><list>

Usage

9

<value>dozer-global-configuration.xml</value><value>dozer-bean-mappings.xml</value><value>more-dozer-bean-mappings.xml</value></list></property></bean>

Usage

10

CustomMappingsViaDozerXMLFilesThissectionwillcoversettingupcustommappingsinxmlfile(s).Ifthetwodifferenttypesofdataobjectsthatyouaremappingcontainanyfieldsthatdon’tshareacommonpropertyname,youwillneedtoaddaclassmappingentrytoyourcustommappingxmlfile.ThesemappingsxmlfilesareusedatruntimebytheDozermappingengine.

Dozerautomaticallyperformsanytypeconversionwhencopyingthesourcefielddatatothedestinationfield.TheDozermappingengineisbi-directional,soifyouwantedtomapthedestinationobjecttothesourceobject,youdonotneedtoaddanotherclassmappingtothexmlfile.

Anexampleofamappingfile….

<?xmlversion="1.0"encoding="UTF-8"?><mappingsxmlns="http://dozermapper.github.io/schema/bean-mapping"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://dozermapper.github.io/schema/bean-mappinghttp://dozermapper.github.io/schema/bean-mapping.xsd"><mapping><class-a>com.github.dozermapper.core.vo.TestObject</class-a><class-b>com.github.dozermapper.core.vo.TestObjectPrime</class-b><field><a>one</a>onePrime</field></mapping><mappingwildcard="false"><class-a>com.github.dozermapper.core.vo.TestObjectFoo</class-a><class-b>com.github.dozermapper.core.vo.TestObjectFooPrime</class-b><field><a>oneFoo</a>oneFooPrime</field></mapping></mappings>

Amappingselementhasmultiplemappingelements,eachwithclassmappingdeclarationsandfieldlevelmappings.Thewildcardattributeissettotruebydefault.Thismeansthatitwillautomaticallytrytomapeverypropertyinthetwoobjects.Whentheattributeissettofalseitwillonlymapexplicitlydefinedfields.

IMPORTANT:Propertiesthatareofthesamenamedonotneedtobespecifiedinthemappingxmlfile.Dozerautomaticallymapsallfieldswiththesamepropertynamefromthesourceobjectintothedestinationobject.

HowCustomMappingFilesAreLoaded

Dozerwillsearchtheentireclasspathlookingforthespecifiedfile.Thegenerallyacceptablewayofdistributingyourmappingsistobundletheminsideyourapplicationarchive.

Alternatively,youcanloadfilesfromoutsidetheclasspathbyprepending"file:"totheresourcename.Ex)"file:c:\somedozermapping.xml"

LoadingFilesfromInputStream

Sinceversion5.4.0itispossibletoloadXMLmappingfilesfromprovidedInputStreamobject.CheckDozerMapperclassforthecorrespondingAPIcalls.

MappingsviaXML

11

MappingsviaXML

12

AnnotationMappings

WhyAnnotations?

OneofthedownsidesofusingDozerforthelongtimewasXml.SinceDozerstartedduringXml-hypeyearsmorethanfiveyearsagothatwasprettyobviouschoicebackthen.AfterthatJava5broughtusannotationsandnewindustryacceptedstyleofconfiguringbehaviourareDomain-SpecificLanguages.DSL-likesupportisprovidedinformofmappingAPI,butsinceversion5.3.2Dozerstartsprovidingannotationssupportaswell.

Theobviousreasonstouseannotationsistoavoidduplicatingfieldandmethodnamesinyourmappingcode.Theannotationcanbeputontothemappedpropertyitselfthusreducingtheamountofcode.Howevertherearecaseswhenannotationsshouldbeavoidedorevenimpossibletouse.Someofthemarethefollowing:

Youaremappingclasses,whicharenotunderyourcontrol,butprovidedinlibraries;

Themappingsarequitecomplexandrequiremanyconfigurations;

InthefirstcaseyoucouldbemappingJAXBgeneratedentitiesorthird-partyDTOsandhavenopossibilitytoputannotations.Inthesecondcasethereisachoiceofputtinglotsofmulti-lineannotationsorisolatingthemappingcodewithcertainduplicationofentitynames.Overannotatedbeanscouldbeproblematictoreadandunderstand.

Usage

WARNING:AnnotationsupportinDozerisexperimentalanddoesnotcovercomplexusecasesyet.HoweveritmaybeusefultoimplementthatsimplestmappingsyouhavehadtodoinXmlorAPIbefore.

Theideaisverysimple.Youput@Mappingannotationeitherongetteroffielddirectly.IfDozerfindsthatitaddsabi-directionalmapping.Itmeansthatputtingannotationoncewillcreatemappingsforbothconversiontypes.Typeconversions(e.g.String-Long)willbechosenautomatically.Globalcustomconvertersareresolvedaswell.Annotationsworkonlyifaconversionissubjecttowildcardrule(activebydefault).Thefollowingexampledemonstratesannotationsinaction.

publicclassSourceBean{

privateLongid;

privateStringname;

@Mapping("binaryData")privateStringdata;

@Mapping("pk")publicLonggetId(){returnthis.id;}

publicStringgetName(){returnthis.name;}}

publicclassTargetBean{

privateStringpk;

privateStringname;

viaAnnotations

13

privateStringbinaryData;

publicvoidsetPk(Stringpk){this.pk=pk;}

publicvoidsetName(Stringname){this.name=name;}}

MappingthegivenbeanswithDozerwillresultinallthreefieldsbeingmapped.Property"name"willbemappedbynamingconvention.Property"id"willbetransformedto"pk".Field"data"willbemovedto"binaryData".Donotworryaboutprivatemodifier;itwillbehandledautomatically.

CurrentlyDozeroffersonlyoneannotation,butthenextoneswillbeaddedinfollowingreleases.Asfornowyoucanmixandmatchallflavoursofmappingtypestoachievethedesiredeffect:Xml,APIandAnnotations.

viaAnnotations

14

APIMappings

XMLMappingFlaws

XML-basedapproachisstableandisusedinmanyproductionprojects.However,itimposesseverallimitations.

First,andmostimportant,isthatitcannotbedynamicallygenerated.AllXMLmappingsshouldbepresentonDozerstart-upandcannotbemodifiedafterwards.Therearetrickyways,whenyoucangenerateandputmappingstothefilesystembyyourowntemplatingengine,butthisapproachisnotsupportedbyDozeritself.Bygeneratingcustommappingsyouareabletoautomaterepetitivechunksoflow-levelDozerlanguage.

SecondproblemisthatyouareforcedtoduplicateallofyourBeanclassnamesinXmlmappings.Thisleadstolotsoftypingandcopy-pasteprogramming.ThiscanbepartlycompensatedbyuseofExpressionLanguageinsideXml,butitisnotsolvingalloftheproblems.

RefactoringsupportislimitedasIDEshouldkeeptrackofclassnamesinXmlfilesandchangethemwhenyourenameormovethereferencedclass.Auto-completionsupportisalsonotavailableinallIDEs.

APIMappings

APImappingsareintendedtosolveallofthementionedproblems.TopreservebackwardscompatibilityAPImappingscanbecombinedwithexistingXmlmappings.Infactsomepartsoftheconfiguration(e.g.globalconfigurationblock)areonlypossibletoexpressinXmlformat.

Togetafeelingofwhatarethesemappingstakealookatthefollowingcodeexample.

importcom.github.dozermapper.core.classmap.RelationshipType;importcom.github.dozermapper.core.loader.api.BeanMappingBuilder;importcom.github.dozermapper.core.loader.api.FieldsMappingOptions;importcom.github.dozermapper.core.loader.api.TypeMappingOptions;

importstaticcom.github.dozermapper.core.loader.api.FieldsMappingOptions.collectionStrategy;importstaticcom.github.dozermapper.core.loader.api.FieldsMappingOptions.copyByReference;importstaticcom.github.dozermapper.core.loader.api.FieldsMappingOptions.customConverter;importstaticcom.github.dozermapper.core.loader.api.FieldsMappingOptions.customConverterId;importstaticcom.github.dozermapper.core.loader.api.FieldsMappingOptions.hintA;importstaticcom.github.dozermapper.core.loader.api.FieldsMappingOptions.hintB;importstaticcom.github.dozermapper.core.loader.api.FieldsMappingOptions.useMapId;importstaticcom.github.dozermapper.core.loader.api.TypeMappingOptions.mapId;importstaticcom.github.dozermapper.core.loader.api.TypeMappingOptions.mapNull;

publicclassMyClass{

publicvoidcreate(){BeanMappingBuilderbuilder=newBeanMappingBuilder(){protectedvoidconfigure(){mapping(Bean.class,Bean.class,TypeMappingOptions.oneWay(),mapId("A"),mapNull(true)).exclude("excluded").fields("src","dest",copyByReference(),collectionStrategy(true,RelationshipType.NON_CUMULATIVE),hintA(String.class),hintB(Integer.class),FieldsMappingOptions.oneWay(),useMapId("A"),customConverterId("id")

viaAPI

15

).fields("src","dest",customConverter("com.github.dozermapper.core.CustomConverter"));}};}}

ConstructedbuilderobjectshouldbethenpassedtoDozerBeanMapperBuilder.ItispossibletoaddmultipleBuilderclasses.

Mappermapper=DozerBeanMapperBuilder.create().withMappingBuilder(builder).build();

viaAPI

16

ConfigurationDozerconfigurationpropertiescanbecustomizedviaanoptionalDozerpropertiesfile.Bydefault,Dozerwilllookforafilenameddozer.propertiestoloadconfigurationproperties.Ifapropertiesfileisnotfoundorspecified,defaultvalueswillbeused.

Dozerisdistributedwithanexampledozer.propertiesfilein/configthatshowsthevariousoptions.Justputtheexamplefileinyourclasspathandcustomizeit.

AnalternativeDozerpropertiesfilecanbespecifiedviathedozer.configurationsystemproperty.ex)-Ddozer.configuration=someDozerConfigurationFile.properties

Table1.DozerConfigurationProperties

PropertyName Description ValidValues Default

dozer.el.enabled

SpecifieswhetherduringXmlmappingsparsingDozerwillrecognizeELexpressions.

true false false

dozer.cache.converter-by-dest-type-maxsize

SpecifiesthemaxsizeforoneofDozersinternalcaches.

0-Long.MAX_VALUE 10000

dozer.cache.super-type-maxsize

SpecifiesthemaxsizeforoneofDozersinternalcaches

0-Long.MAX_VALUE 10000

dozer.beans.proxy-resolver-bean

SpecifiesimplementationofDozerProxyResolvertobeused

Validclassname Defaultimplementation

dozer.beans.class-loader-bean

SpecifiesimplementationofDozerClassLoadertobeused

Validclassname Defaultimplementation

Configuration

17

ConfigurationviaXMLThemajorityofDozer’sbehaviourcanbeconfiguredfromwithinXMLmappingfiles.Settingscanappearinsidefivedifferentscopeswhichaffecttheelementstheyareappliedto:Global,perclassmapping,atindividualclasslevel,perfieldmapping,andatindividualfieldlevel.

ConfigurationScopes

GlobalScope

Theconfigurationblockisusedtosettheglobaldefaultsettings.Also,anyCustomConvertersaredefinedinthissection.Theconfigurationblockisentirely"optional".

Dozersupportstheabilitytohavemultiplemappingfiles.Eachofthesemappingfilescanhavetheirownconfigurationblock.Amappingwillinherititsconfigurationfromthemappingfilethatitisstoredin.Implicitmappingswillinheritthedefaultvaluesforconfiguration.

Thefollowingisthesampleconfigurationblockfromtheexamplemappingsfile:

<configuration><date-format>MM/dd/yyyyHH:mm</date-format><stop-on-errors>true</stop-on-errors><wildcard>true</wildcard><custom-converters><convertertype="com.github.dozermapper.core.converters.TestCustomConverter"><class-a>com.github.dozermapper.core.vo.TestCustomConverterObject</class-a><class-b>another.type.to.Associate</class-b></converter></custom-converters></configuration>

AllglobalsettingsappearasseparateXMLtagscontainingtheirvalue.

PerClassMapping

Globalsettings(ortheirdefaults)canbeoverriddenattheindividualmappinglevel.Here,configurationvaluesaresetusingname="value"attributes.Theywillaffectallmappingoperationsbetweenthetwoclasses.

<mappingwildcard="false"date-format="MM/dd/yyyyHH:mm"><class-a>com.github.dozermapper.core.vo.SpringBean</class-a><class-b>com.github.dozermapper.core.vo.SpringBeanPrime</class-b><field><a>anAttributeToMap</a>anAttributeToMapPrime</field></mapping>

AtIndividualClassLevel

Sometimes,youmaywanttoapplyasettingonlytooneofthetwoclasses.Thiscanbeachievedbyplacingtheattributeinsidetheclass-aorclass-btag:

<mapping><class-ais-accessible="true">com.github.dozermapper.core.vo.SpringBean</class-a>

ConfigurationviaXML

18

<class-b>com.github.dozermapper.core.vo.SpringBeanPrime</class-b><field><a>anAttributeToMap</a>anAttributeToMapPrime</field></mapping>

PerFieldMapping

Likewise,youcanchangethemappingbehaviourforspecificfieldpairs:

<mapping><class-a>com.github.dozermapper.core.vo.SpringBean</class-a><class-b>com.github.dozermapper.core.vo.SpringBeanPrime</class-b><fieldremove-orphans="false"><a>anAttributeToMap</a>anAttributeToMapPrime</field></mapping>

AtIndividualFieldLevel

Finally,somesettingscanbeappliedtoasinglefield:

<mapping><class-a>com.github.dozermapper.core.vo.SpringBean</class-a><class-b>com.github.dozermapper.core.vo.SpringBeanPrime</class-b><field><aget-method="getTheAttribute">anAttributeToMap</a>anAttributeToMapPrime</field></mapping>

AvailableConfigurationSettings

Thefollowingtableliststheavailableconfigurationoptionsandmappingdirectives,inwhichscopestheycanappear,andthesectionofthemanualcontainingmoreinformation:

Name Global ClassMapping

SingleClass

FieldMapping

SingleField

ManualSection

allowed-exceptions X seebelow

custom-converter X Custom

Converters

custom-converter-id X Custom

Converters

custom-converter-param

X CustomConverters

copy-by-reference X CopyBy

Reference

copy-by-references X CopyBy

Reference

ConfigurationviaXML

19

create-method X X

CustomCreateMethod

bean-factory X X X

CustomBeanFactories

date-format X X XStringtoDateMapping

factory-bean-id X

CustomBeanFactories

get-method X CustomMethods

is-accessible X X


key X MapMapping

map-empty-string X X X Excluding

Fields

map-id XContextBasedMapping

map-null X X X ExcludingFields

map-set-method X X Map

Mapping

map-get-method X X Map

Mapping

relationship-type X X X Collection

Mapping

remove-orphans X Collection

Mapping

set-method X CustomMethods

skip-constructor X


stop-on-errors X seebelow

ConfigurationviaXML

20

trim-strings X X seebelow

type X X One-WayMapping

variables X ExpressionLanguage

wildcard X X seebelow

wildcard-case-insensitive

X X seebelow

Errorhandling(stop-on-errors,allowed-exceptions)

Bydefault,ifDozerencountersanerrorwhileperformingafieldmapping,anexceptionisthrownandthemappingaborted.Whilethisistherecommendedbehaviour,Dozercanbeinstructedtoignoretheerrorandsimplycontinuewiththenextfield,viathestop-on-errorspolicy.

YoucanalsospecifyexceptionsthatshouldcauseDozertostopandrethrowthem,evenifstop-on-errorsissettofalse,usingtheallowed-exceptionselement:

<configuration><stop-on-errors>false</stop-on-errors><allowed-exceptions><exception>org.example.UnrecoverableError</exception><exception>org.example.BadException</exception></allowed-exceptions></configuration>

TrimmingStrings(trim-strings)

Asthenamesuggests,trim-stringsappliesJava’sString.trim()tothesourcevaluebeforecallingthetargetbeans’ssetter.

Wildcardmapping(wildcard,wildcard-case-insensitive)

Perdefault,Dozermapsallfieldsbetweensourceandtargetbeanthatsharethesamename("wildcardmapping").Listingfieldsinmappingdefinitionsdoesnotoverridethisbehaviour,exceptforthegivenfields.Forexample,giventhefollowingclasses

classPerson{privateStringfirstName;privateStringlastName;}

classContact{privateStringfirstName;privateStringsurname;}

andthemappingdefinition

<mapping>

ConfigurationviaXML

21

<class-a>com.github.dozermapper.core.vo.Person</class-a><class-b>com.github.dozermapper.core.vo.Contact</class-b><field><a>lastName</a>surname</field></mapping>

amappingfromaPersonobjectontoaContactwillmaplastNametosurnameandfirstNametofirstName,eventhoughthelatterpairisnotmentionedinthemappingdefinition.

Youcandisablewildcardmappinggloballyorattheclassmappinglevelbysettingwildcardtofalse.Ifyoudo,youhavetoexplicitlyspecifyeachpairoffieldsthatshouldbemapped:

<mappingwildcard="false"><class-a>com.github.dozermapper.core.vo.Person</class-a><class-b>com.github.dozermapper.core.vo.Contact</class-b><field><a>lastName</a>surname</field><field><a>firstName</a>firstName</field></mapping>

UptoDozerversion5.4.0,wildcardmappingswerecaseinsensitive.CurrentversionsofDozeronlyautomaticallymapfieldswiththeexactsamename.Youcanenabletheoldcaseinsensitivebehaviourbysettingthewildcard-case-insensitivepolicytotrue.Then,forexampleasourcefieldnamedcamelCasewillbemappedtotargetfieldcamelcase(andviceversa).

ConfigurationviaXML

22

ConfigurationviaAPIIfyouareusingtheMapperBuildertodefineyourmappings,youcandeclaremapping,class,andfieldconfigurationsettingsprogrammatically:

Mappermapper=DozerBeanMapperBuilder.create().withMappingBuilder(newBeanMappingBuilder(){@Overrideprotectedvoidconfigure(){mapping(type(A.class).mapEmptyString(true),type(B.class),TypeMappingOptions.wildcardCaseInsensitive(true)).fields(field("fieldOfA").getMethod("getTheField"),field("fieldOfB"),FieldsMappingOptions.oneWay());}}).build();

GlobalconfigurationiscurrentlynotsupportedbytheAPI.

PleaseseeConfigurationviaXMLforalistoftheavailableconfigurationsettings.

ConfigurationviaAPI

23

MappingClassesAnexampleofmappingtwoclassesisdefinedbelow.Note:Explicitxmlmappingfor2classesisnotrequiredifallthefieldmappingbetweensrcanddestobjectcanbeperformedbymatchingonattributename.Customxmlclassmappingisonlyrequiredwhenyouneedtospecifyanycustomfieldmappings.

<mappings><mapping><class-a>com.github.dozermapper.core.vo.TestObject</class-a><class-b>com.github.dozermapper.core.vo.TestObjectPrime</class-b></mapping></mappings>

Thesemappingsarebi-directionalsoyouwouldneverneedtodefineanXMLmapforTestObjectPrimetoTestObject.Ifthesetwoclasseshadreferencestocomplextypesthatneededtypetransformation,youwouldalsodefinethemasmappings.Dozerrecursivelygoesthroughanobjectandmapseverythinginit.Datatypeconversionisperformedautomatically.Dozeralsosupportsnoattributemappingsatall.Ifsuppliedtwoclassesthatarenotmapped,itsimplytriestomappropertiesthatarethesamename.

MappingClasses

24

ImplicitPropertyMapping(bi-directional)

MatchingfieldnamesareautomaticallyhandledbyDozer.

Propertiesthatareofthesamenamedonotneedtobespecifiedinthemappingxmlfile.

SimpleMappings(bi-directional)

Wewillstartoffsimple.Ifyouhavetwopropertieswithdifferentnamestheycanbemappedassuch:

<field><a>one</a>onePrime</field>

Datatypeconversion

DatatypecoversionisperformedautomaticallybytheDozermappingengine.Currently,Dozersupportsthefollowingtypesofconversions:(theseareallbi-directional)

PrimitivetoPrimitiveWrapper

PrimitivetoCustomWrapper

PrimitiveWrappertoPrimitiveWrapper

PrimitivetoPrimitive

ComplexTypetoComplexType

StringtoPrimitive

StringtoPrimitiveWrapper

StringtoComplexTypeiftheComplexTypecontainsaStringconstructor

StringtoMap

CollectiontoCollection

CollectiontoArray

MaptoComplexType

MaptoCustomMapType

EnumtoEnum

Eachofthesecanbemappedtooneanother:java.util.Date,java.sql.Date,java.sql.Time,java.sql.Timestamp,java.util.Calendar,java.util.GregorianCalendar

StringtoanyofthesupportedDate/CalendarObjects.

ObjectscontainingatoString()methodthatproducesalongrepresentingtimein(ms)toanysupportedDate/Calendarobject.

RecursiveMapping(bi-directional)


25

DozersupportsfullClasslevelmappingrecursion.Ifyouhaveanycomplextypesdefinedasfieldlevelmappingsinyourobject,DozerwillsearchthemappingsfileforaClasslevelmappingbetweenthetwoClassesthatyouhavemapped.Ifyoudonothaveanymappings,itwillonlymapfieldsthatareofthesamenamebetweenthecomplextypes.


26

InheritanceMapping

ReducingMappingXMLwhenusingbaseclassattributes

Propertiesthatareofthesamenamedonotneedtobespecifiedinthemappingxmlfileunlesshintsareneeded.

IfyouaremappingsubclassesthatalsohavehavebaseclassattributesrequiringmappingXML,youmightbeinclinedtoreproducebaseclassfieldmapsineachsubclassmappingelement,likethefollowingexample:

<mapping><class-a>com.github.dozermapper.core.vo.SubClass</class-a><class-b>com.github.dozermapper.core.vo.SubClassPrime</class-b><field><a>superAttribute</a>superAttr</field><field><a>attribute2</a>attributePrime2</field></mapping><mapping><class-a>com.github.dozermapper.core.vo.SubClass2</class-a><class-b>com.github.dozermapper.core.vo.SubClassPrime2</class-b><field><a>superAttribute</a>superAttr</field><field><a>attribute2</a>attributePrime2</field></mapping>

Inthepreviousmapping,someofthefieldswerefromacommonbaseclass,butyouhadtoreproducethemintoeachmappingofthesubclasses.

However,abetterwaytodoitwouldbetomapthebaseclassindividually.Thiscanbedoneforeachbaseclass(inthecaseofalargerheirarchy).Assumingthebaseclassname,belowistherefactoredmappingxml:

<mapping><class-a>com.github.dozermapper.core.vo.SuperClass</class-a><class-b>com.github.dozermapper.core.vo.SuperClassPrime</class-b><field><a>superAttribute</a>superAttr</field></mapping><mapping><class-a>com.github.dozermapper.core.vo.SubClass</class-a><class-b>com.github.dozermapper.core.vo.SubClassPrime</class-b><field><a>attribute</a>attributePrime</field></mapping><mapping><class-a>com.github.dozermapper.core.vo.SubClass2</class-a>

InheritanceMapping

27

<class-b>com.github.dozermapper.core.vo.SubClassPrime2</class-b><field><a>attribute2</a>attributePrime2</field></mapping>

Thefollowingimagesexplainsomeofthedifferentscenariosdozerhandles.Eachdiagramshowstwomappedclasshierarchiesandexistingrelations,whichDozerrecognizesandmaps.

Scenario1showsthatifyoumapSubClasstoClassPrimeallattributesfromSuperClass→ClassPrimewillbemappedaswell.

Scenario2showsthatDozerhasnolimitationsontheinheritancedepthitanalyzestofindparentmappings.

InheritanceMapping

28

Scenario3showsthatitispossibletomaptwocollectionswithdifferentsubctypesofthesameparenttype.Thisisdonebyprovidinghintstothecollectionmapping,describingallpotentialsubclasses.

<field><a>aList</a>bList<a-hint>B1,B2</a-hint><b-hint>BPrime1,BPrime2</b-hint></field>

InheritanceMapping

29

ContextBasedMappingContextbasedmappingcanbespecifiedbyusingthemap-idattribute.Notethatwealsosupportnestedcontextmappingbyspecifyingamap-idatthefieldlevel.

<mappingmap-id="caseA"><class-a>com.github.dozermapper.core.vo.context.ContextMapping</class-a><class-b>com.github.dozermapper.core.vo.context.ContextMappingPrime</class-b><field-exclude><a>loanNo</a>loanNo</field-exclude><fieldmap-id="caseC"><a>contextList</a>contextList<b-hint>com.github.dozermapper.core.vo.context.ContextMappingNestedPrime</b-hint></field></mapping><mappingmap-id="caseB"><class-a>com.github.dozermapper.core.vo.context.ContextMapping</class-a><class-b>com.github.dozermapper.core.vo.context.ContextMappingPrime</class-b></mapping><mappingmap-id="caseC"><class-a>com.github.dozermapper.core.vo.context.ContextMappingNested</class-a><class-b>com.github.dozermapper.core.vo.context.ContextMappingNestedPrime</class-b><field-exclude><a>loanNo</a>loanNo</field-exclude></mapping><mappingmap-id="caseD"><class-a>com.github.dozermapper.core.vo.context.ContextMappingNested</class-a><class-b>com.github.dozermapper.core.vo.context.ContextMappingNestedPrime</class-b></mapping>

TouseaparticularcontextwheninvokingtheMapper,yousimplyspecifythemap-idinyourmappingcall.

ContextMappingPrimecmpA=mapper.map(cm,ContextMappingPrime.class,"caseA");

ContextBasedMapping

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One-WayMappingYoucansethowamappingdefinitionbehavesasfarasdirectiongoes.Ifyouonlywanttomaptwoclassestogoone-wayyoucansetthisatthemappinglevel.Thedefaultisbi-directional.ThiscanbesetatthemappinglevelORthefieldlevel.Whenone-wayisspecified,"a"isalwaysthesrcobjectand"b"isalwaysthedestinationobject.

<mappingtype="one-way"><class-a>com.github.dozermapper.core.vo.TestObjectFoo</class-a><class-b>com.github.dozermapper.core.vo.TestObjectFooPrime</class-b><field><a>oneFoo</a>oneFooPrime</field></mapping>

Inthefollowingexampletheone-wayfieldsareonlymappedwhen"a"objectismappedto"b"object.If"b"ismappedto"a",thenthefieldisnotmapped.

<mapping><class-a>com.github.dozermapper.core.vo.TestObjectFoo2</class-a><class-b>com.github.dozermapper.core.vo.TestObjectFooPrime2</class-b><fieldtype="one-way"><a>oneFoo2</a>oneFooPrime2</field><fieldtype="one-way"><a>oneFoo3.prime</a>oneFooPrime3</field></mapping>

ExcludingFieldsOne-Way

Dozersupportsfieldexcludesgoingone-wayasshownintheexample.Intheexamplethefieldisonlyexcludedwhen"a"ismappedto"b".If"b"ismappedto"a",thenthefieldisnotexcluded.

<field-excludetype="one-way"><a>fieldToExclude</a>fieldToExclude</field-exclude>

One-WayMapping

31

CopyingByObjectReferenceDozersupportscopyinganobjectbyreference.Noconversion/transformationisdoneforsuchobjects.Thisapproachallowstodecreaseanumberofobjectallocations,butisapplicableonlywhenJavaBeansaretobethrownaway(GarbageCollected)aftertransformation.Thisapproachisgenerallyrecommendedforperformancetuningofthemappingprocesswhenpossible.Makesurethatbothobjecttypesarethesameoryouwillrunintocastingproblems.Thedefaultvalueis'false'.

<fieldcopy-by-reference="true"><a>copyByReference</a>copyByReferencePrime</field>

Thisisalsosupportedattheclasslevel.Justdefinetheclassesyouwanttobecopiedbyreferenceintheconfigurationblock.

<configuration><copy-by-references><copy-by-reference>com.github.dozermapper.core.vo.NoExtendBaseObjectGlobalCopyByReference</copy-by-reference></copy-by-references></configuration>

Ontheclasslevelwildcardexpressionsareallowed.Copybyreferenceisappliedviamask,whichcaninlcudemultiplewildcard(*)characters.

<configuration><copy-by-references><copy-by-reference>com.github.dozermapper.core.vo.*</copy-by-reference><copy-by-reference>com.github.dozermapper.core.*.vo.*DTO</copy-by-reference></copy-by-references></configuration>

Referencingself(this)inafieldmapping

UsingafieldmappingitispossibletomapwhereN==0(self,orthis).InthefollowingexampleSimpleAccountismappedtoAddress.ItisalsomappedtoAccount.SupposeAddresswasanattributeonAccount.HowcouldwemapthevaluesonSimpleAccounttothatproperty?Theansweristousethekeyword(this)todenoteusingtheclassbeingmappedasthesourceobject.

<mapping><classa>com.github.dozermapper.core.vo.self.SimpleAccount</classa><classb>com.github.dozermapper.core.vo.self.Account</classb><field><a>this</a>address</field></mapping><mapping><classa>com.github.dozermapper.core.vo.self.SimpleAccount</classa><classb>com.github.dozermapper.core.vo.self.Address</classb>


32

<field><a>streetName</a>street</field></mapping>


33

DeepPropertyMappingItispossibletomapdeepproperties.AnexamplewouldbewhenyouhaveanobjectwithaStringproperty.YourotherobjecthasaStringpropertybutitisseverallevelsdeepwithintheobjectgraph.IntheexamplebelowtheDestDeepObjhasnestedattributeswithintheobjectgraphthatneedtobemapped.Typehintsaresupportedfordeepfieldmappings.Theattributescopy-by-reference,type=one-way,andrelationship-typecanalsobeused.

<mapping><class-a>com.github.dozermapper.core.vo.deep.SrcDeepObj</class-a><class-b>com.github.dozermapper.core.vo.deep.DestDeepObj</class-b><field><a>srcNestedObj.src1</a>dest1</field><field><a>srcNestedObj.src2</a>dest2</field><field><a>srcNestedObj.srcNestedObj2.src5</a>dest5</field><field><a>srcNestedObj.hintList</a>hintList<a-hint>java.lang.String</a-hint><b-hint>java.lang.Integer</b-hint></field><field><a>srcNestedObj.hintList2</a>hintList2<a-hint>com.github.dozermapper.core.vo.TheFirstSubClass</a-hint><b-hint>com.github.dozermapper.core.vo.TheFirstSubClassPrime</b-hint></field><fieldcopy-by-reference="true"><a>srcNestedObj.hintList3</a>hintList3</field></mapping>

DeepIndexedMapping

Indexedmappingwithindeepmappingissupported.

<field><a>offSpringName</a>pets[1].offSpring[2].petName</field>

DestinationHintsareNOTrequirediftheindexedcollectionisanArrayorifyouareusingjdk1.5Generics.Dozerisabletoautomaticallydeterminethepropertytypefortheseusecases.ButyouwillneedtoprovidehintsifthedatatypesarenotArraysorifyouarenotusingGenerics.ThisisrequiredsothatDozerknowswhattypesofdestobjectstocreatewhileittraversesthedeepfieldmapping.

Thefollowingisanexampleofusinghints…..

<field><a>someField</a>

DeepPropertyMapping

34

someList[1].someOtherList[0].someOtherField<b-deep-index-hint>com.github.dozermapper.core.vo.TestObject,com.github.dozermapper.core.vo.AnotherTestObject</b-deep-index-hint></field>

DeepPropertyMapping

35

IndexedPropertyMappingFieldsthatneedtobelookeduporwrittentobyindexedpropertyaresupported.

<mapping><class-a>com.github.dozermapper.core.vo.Individuals</class-a><class-b>com.github.dozermapper.core.vo.FlatIndividual</class-b><field><a>usernames[0]</a>username1</field><field><a>usernames[1]</a>username2</field><field><a>individual.username</a>username2</field><field><a>secondNames[1]</a>secondName1</field><field><a>secondNames[2]</a>secondName2</field><field><a>aliases.otherAliases[0]</a>primaryAlias</field></mapping>

IndexedPropertyMapping

36

ExcludingFieldsDozersupportsexcludingfieldsfromamappingusingthefield-excludetag.Wealsosupportfieldexcludesgoingone-wayasshownintheexample.

<field-exclude><a>fieldToExclude</a>fieldToExclude</field-exclude>

<field-excludetype="one-way"><a>fieldToExclude</a>fieldToExclude</field-exclude>

Wildcard-excludingdefaultfieldmappings

There’salsoaflag(wildcard)setonclassmappingwhichcontrolswhetherthedefaultmapping(whichappliestopairofpropertiesofthesamename)shouldbedone.Thedefaultvalueistrue.Forexample:

<mappingwildcard="false"><class-a>com.github.dozermapper.core.vo.AnotherTestObject</class-a><class-b>com.github.dozermapper.core.vo.AnotherTestObjectPrime</class-b><field><a>field1</a>field1</field></mapping>

Thisconfigurationwouldcauseonlythefieldsfield1inbothclassestobemapped,evenifbothclassesshareapropertywiththesamenamecalled`field2`.

ExcludeMappingNullValues

Youcanbypassthemappingofnullvalues.Ifthisisspecified,thedestfieldmappingisbypassedatruntimeandthedestinationvaluesettermethodwillnotbecalledifthesrcvalueisnull.Thiscanbespecifiedatthemappingorclasslevel.Forexample:

<mappingmap-null="false"><class-a>com.github.dozermapper.core.vo.AnotherTestObject</class-a><class-b>com.github.dozermapper.core.vo.AnotherTestObjectPrime</class-b><field><a>field4</a>to.one</field></mapping>

OR…

<mapping><class-a>com.github.dozermapper.core.vo.AnotherTestObject</class-a><class-bmap-null="false">com.github.dozermapper.core.vo.AnotherTestObjectPrime</class-b><field><a>field4</a>to.one</field>

ExcludingFields

37

</mapping>

ExcludeMappingEmptyStrings

YoucanbypassthemappingofemptyStringvalues.Ifthisisspecified,thedestfieldmappingisbypassedatruntimeandthedestinationvaluesettermethodwillnotbecalledifthesrcvalueisanemptyString.Thiscanbespecifiedatthemappingorclasslevel.Forexample:

<mappingmap-empty-string="false"><class-a>com.github.dozermapper.core.vo.AnotherTestObject</class-a><class-b>com.github.dozermapper.core.vo.AnotherTestObjectPrime</class-b><field><a>field4</a>to.one</field></mapping>

OR…

<mapping><class-a>com.github.dozermapper.core.vo.AnotherTestObject</class-a><class-bmap-empty-string="false">com.github.dozermapper.core.vo.AnotherTestObjectPrime</class-b><field><a>field4</a>to.one</field></mapping>

ExcludingFields

38

MappingConcepts

AssemblerPattern

DozercanbeusedasanAssembler.MartinFowlerhasagreatexplanationofwhyandwhenyouwoulduseanAssembler.Basically,itisawaytotakemultiplefinegrainobjectsandcreateonecoarsegrainobjectusedfordatatransfer.Aslongasyouhavemappingsdefinedforeachofyourfinegrainedobjectstoyourcoarsegrainobjectyoucancallthemappermultipletimestoachievethedesiredassemblerpattern.

mapper.map(sourceA,ClassB.class);

Let’ssaythatClassA,ClassB,andClassCallmaptoClassD.Firstcreatetheseindividualmappingsinthemappingfile.Next,callthemapperonceforeachmapping.Notethatthiswouldalsoworkinabi-directinonalmanner.

ClassDd=newClassD();mapper.map(sourceA,d);mapper.map(sourceB,d);mapper.map(sourceC,d);

AssemblerPattern

39

http://www.martinfowler.com/eaaCatalog/dataTransferObject.html

http://www.martinfowler.com/eaaCatalog/dataTransferObject.html

MappingimmutabletypesYoucancreateobjectswhenconstructorisnotavailable,orwhenthereisnono-argsconstructorintheclass.Featureisdesignedformappingimmutabletypes.Touseit,atthemappingleveladdanoptiontoskiptheconstructor,thenatthefieldlevelchoosetoinjectthevaluedirectlytothefield,skippingthesetter.

<mapping><class-a>com.github.dozermapper.core.vo.AnyExternalModelClass</class-a><class-bskip-constructor="true">com.github.dozermapper.core.vo.ImmutableModelClass</class-b><field><a>externalModelField</a><bis-accessible="true">ourFinalField</field></mapping>


40

EnumMappingTomapanenumsvaluetoanotherenumisshownbelow.

<field><a>status</a>statusPrime</field>

Basedonthefollowingcode:

enumStatus{PROCESSING,SUCCESS,ERROR}

publicclassUserGroup{

privateStatusstatus;

publicStatusgetStatus(){returnstatus;}

publicvoidsetStatus(Statusstatus){this.status=status;}

}

enumStatusPrime{PROCESSING,SUCCESS,ERROR}

publicclassUserGroupPrime{

privateStatusPrimestatusPrime;

publicStatusPrimegetStatusPrime(){returnstatusPrime;}

publicvoidsetStatusPrime(StatusPrimestatusPrime){this.statusPrime=statusPrime;}

}

Enums

41

StringtoDateMappingAdateformatfortheStringcanbespecifiedatthefieldlevelsothatthenecessarydatatypeconversioncanbeperformed.

<field><adate-format="MM/dd/yyyyHH:mm:ss:SS">dateString</a>dateObject</field>

Adefaultdateformatcanalsobespecifiedattheclassmappinglevel.Thisdefaultdateformatwillbeappliedtoallfieldmappingsunlessitisoverriddenatthefieldlevel.

<mappingdate-format="MM-dd-yyyyHH:mm:ss"><class-a>com.github.dozermapper.core.vo.TestObject</class-a><class-b>com.github.dozermapper.core.vo.TestObjectPrime</class-b><field><a>dateString</a>dateObject</field></mapping>

Adefaultdateformatcanalsobespecifiedattheverytopmappingslevel.Thisdefaultdateformatwillbeappliedtoallfieldmapppingsunlessitisoverriddenatalowerlevel

<mappings><configuration><date-format>MM/dd/yyyyHH:mm</date-format></configuration><mappingwildcard="true"><class-a>com.github.dozermapper.core.vo.TestObject</class-a><class-b>com.github.dozermapper.core.vo.TestObjectPrime</class-b><field><a>dateString</a>dateObject</field></mapping><mapping><class-a>com.github.dozermapper.core.vo.SomeObject</class-a><class-b>com.github.dozermapper.core.vo.SomeOtherObject</class-b><field><a>srcField</a>destField</field></mapping></mappings>

StringtoDate

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CollectionandArrayMappingDozerautomaticallymapsbetweencollectiontypesandautomaticallyperformsanytypeconversion.Eachelementinthesourcecollectionismappedtoanelementinthedestobject.Hintsareusedtospecifywhattypeofobjectsarecreatedinthedestinationcollection.ThefollowingcollectionmappingisautomaticallyhandledbyDozer:(Theseareallbi-directional)

ListtoList

ListtoArray

ArraytoArray

SettoSet

SettoArray

SettoList

UsingHintsforCollectionMapping

HintsarenotrequiredifyouareusingJDK1.5GenericsorArraysbecausethetypescanbeautodetectedbyDozer.ButifyouarenotusinggenericsorArrays,toconvertaCollection/ArraytoaCollection/ArraywithdifferenttypeobjectsyoucanspecifyaHinttoletDozerknowwhattypeofobjectsyouwantcreatedinthedestinationlist.IfaHintisnotspecifiedforthedestinationfield,thenthedestinationCollectionwillbepopulatedwithobjectsthatarethesametypeastheelementsinthesrcCollection.

<field><a>hintList</a>hintList<b-hint>com.github.dozermapper.core.vo.TheFirstSubClassPrime</b-hint></field>

BelowisasummaryofthemappinglogicusedwhenmappingArrays,Sets,andLists.Thisgivesabreakdownofwhathappenswhenhintsareorarenotused.

ListtoList

**DestHintreq’d:NO

DestHintallowed:YES

Ifnodesthintspecified:Destlistwillcontainthesamedatatypesinthesource

Ifhintisspeficied:Destlistwillcontainobjectsthatmatchdesthint(s)type

ArraytoList


DestHintallowed:YES



ListtoArray


43


DestHintallowed:YES

Ifnodesthintspecified:Destarraywillcontaindatatypesdefinedbythearray

Ifhintisspeficied:Destlistwillcontainobjectsthatmatchdesthint(s)type(onlyifObjectArray)

ArraytoArray


DestHintallowed:YES



SettoSet


DestHintallowed:YES



ArraytoSet


DestHintallowed:YES



SettoArray


DestHintallowed:YES



ListtoSet


DestHintallowed:YES



SettoList


DestHintallowed:YES




44

UsingJDK1.5GenericsforCollectionMappingHintsarenotrequiredwhenJDK1.5Genericsareused.ToconvertaCollection/ArraytoaCollection/Arraywithdifferenttypeobjectsdozercandetermineparameterizedtypesatruntime.

publicclassUserGroup{

privateSet<User>users;

publicSet<User>getUsers(){returnusers;}

publicvoidsetUsers(Set<User>aUsers){users=aUsers;}

}publicclassUserGroupPrime{

privateList<UserPrime>users;

publicList<UserPrime>getUsers(){returnusers;}

publicvoidsetUsers(List<UserPrime>aUsers){users=aUsers;}

}

ObjectArraytoList(bi-directional)

WhenconvertinganObjectarraytoaList,bydefaultthedestinationListwillcontainthesamedatatypeasthesourceArray.

<field><a>arrayForLists</a>listForArray</field>

Useahintfordatatypeconversion.Becauseahintisspecified,thedestinationListwillcontainStringelementsinsteadofIntegers.

<field><a>arrayForLists</a>listForArray<b-hint>java.lang.String</b-hint></field>

PrimitiveArraytoPrimitiveArray(bi-directional)

WhenconvertinganObjectarraytoanArray,bydefaultthedestinationArraywillcontainthesamedatatypeasthesourceArray.




45

<field><a>anArray</a>theMappedArray</field>

Cumulativevs.Non-CumulativeListMapping(bi-directional)

IfyouaremappingtoaClasswhichhasalreadybeeninitialized,dozerwilleither'add'or'update'objectstoyourList.IfyourListorSetalreadyhasobjectsinitdozerchecksthemappedList,Set,orArrayandcallsthecontains()methodtodetermineifitneedsto'add'or'update'.Thisisdeterminedusingtherelationship-typeattributeonthefieldtag.Thedefaultis'cumulative'.relationship-typecanbespecifedatthefieldmapping,classmapping,orglobalconfigurationlevel.

globalconfigurationlevel….

<mappings><configuration><relationship-type>non-cumulative</relationship-type></configuration></mappings>

classmappinglevel….

<mappings><mappingrelationship-type="non-cumulative"><class-a>com.github.dozermapper.core.vo.TestObject</class-a><class-b>com.github.dozermapper.core.vo.TestObjectPrime</class-b><field><a>someList</a>someList</field></mapping></mappings>

fieldmappinglevel….

<fieldrelationship-type="cumulative"><a>hintList</a>hintList<a-hint>com.github.dozermapper.core.vo.TheFirstSubClass</a-hint><b-hint>com.github.dozermapper.core.vo.TheFirstSubClassPrime</b-hint></field>

<fieldrelationship-type="non-cumulative"><a>unequalNamedList</a>theMappedUnequallyNamedList</field>

Note:ifyoudonotdefinecustomequals()andhashCode()methodsnon-cumulativeoptionwillnotfunctionproperly,asDozerwillfailtodetermineobjectequalityandwillrelyonJDKgeneratedobjectIds.Indefaultcasetwoinstancesofaclassarealwaystreatedasdifferentandupdatewillnotoccure.

RemovingOrphans


46

Orphansareelementswhichexistinadestinationcollectionthatdidnotexistwithinthesourcecollection.Dozerwillremoveorphansbycallingthe'remove'methodonactualorphansoftheunderlyingdestinationcollection;itwillnotclearall.Todetermineelementswhichareorphansdozerusesthecontains()methodtocheckiftheresultscontainsorphans.Thedefaultsettingvalueisfalse.

<fieldremove-orphans="true"><a>srcList</a>destList</field>


47

MaptoMap

Dozerwillmapajava.util.Maptoajava.util.Map.Iftherearecomplextypeswithhintsitwilldodeeprecursionmappingaswell.Ifthedestinationmapexistsitwilladdelementstotheexistingmap.

<mapping><class-a>com.github.dozermapper.core.vo.map.MapToMap</class-a><class-b>com.github.dozermapper.core.vo.map.MapToMapPrime</class-b><field><a>standardMapWithHint</a>standardMapWithHint<a-hint>com.github.dozermapper.core.vo.TestObject</a-hint><b-hint>com.github.dozermapper.core.vo.TestObjectPrime</b-hint></field></mapping>

MappingFieldLevelPropertiestoajava.util.MaporaCustomMapwithuniqueGet/Setmethods

Dozersupportsmappingmapbackedpropertiesatthefieldlevel.Themapcaneitherimplementthejava.util.MapInterfaceorbeacustommapwithasetofuniqueGet/Setmethods.

InthisexampleFieldAisabasicStringanditismappedtoFieldBwhichisaHashMap.ThekeyintheHashMapwillbe"stringProperty"(theattributename)andthevaluewillbewhatevervalueisstoredinthatattribute.

<mapping><class-a>com.github.dozermapper.core.vo.map.PropertyToMap</class-a><class-b>com.github.dozermapper.core.vo.map.MapToProperty</class-b><field><a>stringProperty</a>hashMap</field></mapping>

ThisexampleshowsFieldAisabasicStringanditismappedtoFieldBwhichisaHashMap.ThekeyintheHashMapwillbe"myStringProperty"andthevaluewillbewhatevervalueisstoredinthatattribute.AlsonoticethatFieldAhasauniquesetter()methodname.

<mapping><class-a>com.github.dozermapper.core.vo.map.PropertyToMap</class-a><class-b>com.github.dozermapper.core.vo.map.MapToProperty</class-b><field><aset-method="addStringProperty2">stringProperty2</a><bkey="myStringProperty">hashMap</field></mapping>

ThisexampleshowsFieldAisabasicStringanditismappedtoFieldBwhichisacustommap.Thekeyinthecustommapwillbe"myCustomProperty"andthevaluewillbewhatevervalueisstoredinthatattribute.NoticethatFieldBhasuniquemapgetter()andmapsetter()methodnames.IfyouareusingacustommapyoumustexplicitlysetthemapGet/Setmethodnames.AdestinationhintcanalsobeprovidedifyourcustommapimplementsanInterfaceorisanAbstractclass.


48

<mapping><class-a>com.github.dozermapper.core.vo.map.PropertyToMap</class-a><class-b>com.github.dozermapper.core.vo.map.MapToProperty</class-b><field><a>stringProperty3</a><bmap-get-method="getValue"map-set-method="putValue"key="myCustomProperty">customMap</field><field><a>stringProperty4</a><bmap-get-method="getValue"map-set-method="putValue"key="myCustomNullProperty">nullCustomMap<b-hint>com.github.dozermapper.core.vo.map.CustomMap</b-hint></field><field><a>stringProperty5</a><bmap-get-method="getValue"map-set-method="putValue">customMap</field></mapping>

MappingClassLevelPropertiestoajava.util.MaporaCustomMapwithuniqueGet/Setmethods

Dozercanalsomapentirecomplexobjectsdirectlytoajava.util.Maporacustommapobject.Thisexampleshowsthedeclarationofamappingbetweenacomplexobject(PropertyToMap)andajava.util.Map.Whendoingthisyouneedtoexplicitlydefineauniquemap-idforthemapping.Thisisusedwhendeterminingwhichmaptouseatrun-time.EveryattributeonthePropertyToMapclasswillbemappedtothejava.util.Map.YouDONOTneedtoexplicitlydefinethesemappings.Fieldexcludemappingscanbeusedtoexcludefieldsatrun-time.Iftheattributenameisnotthesameasthemapkeyjustsetthekeyattributeforacustomfieldmapping.ThemappingtostringProperty2showsanexampleofthis.

Thesecondexampleshowshowtosetupacustommapobject.Theonlydifferencehereisthatyouneedtoexplicitlydefinemap-set-methodandmap-get-methodvalues.Thesecorrespondtothejava.util.Mapget()andput()methods.

<mappingmap-id="myTestMapping"><class-a>com.github.dozermapper.core.vo.map.PropertyToMap</class-a><class-b>java.util.Map</class-b><field><aset-method="addStringProperty2">stringProperty2</a><bkey="myStringProperty">this</field><field-exclude><a>excludeMe</a>this</field-exclude></mapping><mappingmap-id="myCustomTestMapping"><class-a>com.github.dozermapper.core.vo.map.PropertyToMap</class-a><class-bmap-set-method="putValue"map-get-method="getValue">com.github.dozermapper.core.vo.map.CustomMap</class-b><field><aset-method="addStringProperty2">stringProperty2</a><bkey="myStringProperty">this</field><field-exclude><a>excludeMe</a>this</field-exclude></mapping>


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Theexamplebelowshowshowtousethesemappings.Noticethatthefieldmappingsreferenceamap-id.ThefirstfieldmappingwillusethemyTestMappingdefinedmappingandmapaccordingly.Samegoeswiththecustommapping.

<mapping><class-a>com.github.dozermapper.core.vo.map.MapTestObject</class-a><class-b>com.github.dozermapper.core.vo.map.MapTestObjectPrime</class-b><fieldmap-id="myTestMapping"><a>propertyToMap</a>propertyToMapMap</field><fieldmap-id="myTestMapping"><a>propertyToMapToNullMap</a>nullPropertyToMapMap<b-hint>java.util.HashMap</b-hint></field><fieldmap-id="myCustomTestMapping"><a>propertyToCustomMap</a>propertyToCustomMapMap</field></mapping>

TheClassLevelmapbackedmappingscanalsobeusedasastandardmapping.ForthisdozerhasanewAPI.InadditiontothesourceanddestinationclassesyoucannowpassinthemapreferenceId.

//Example1PropertyToMapptm=newPropertyToMap();ptm.setStringProperty("stringPropertyValue");ptm.addStringProperty2("stringProperty2Value");Mapmap=Mapper.map(ptm,HashMap.class,"myTestMapping");

//Example2CustomMapcustomMap=mapper.map(ptm,CustomMap.class,"myCustomTestMapping");

//Example3CustomMapcustom=newCustomMap();custom.putValue("myKey","myValue");Mapper.map(ptm,custom,"myCustomTestMapping");

//Example4-MapBackMapmap=newHashMap();map.put("stringProperty","stringPropertyValue");PropertyToMapproperty=mapper.map(map,PropertyToMap.class,"myTestMapping");assertEquals("stringPropertyValue",property.getStringProperty());


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ProxyObjects

Overview

Dozersupportsmappingsdoneonproxyobjects.Thisistypicallythecasewhenusingpersistenceframework,whichsupportssophisticatedfeatureslikelazy-loading.Inthiscaseapplicationisworkingwithfakeobjects,containingtherealobjectsencapsulated.Implementationofproxiesisdependantonthetechnologyyouuse.Generallyspeaking,therearetwopopularlibrariesforcreatingJavaproxies(CglibandJavassist).However,howparticularframeworkmakesusesofthemcouldalsovary.Dozeroffersbydefaultagenericwaytohandlesimpleproxyscenarios,bothJavassistandCglib.Howeveritisstronglyrecommendedtotuneproxyhandlingbehaviorforyourparticularscenario.

Configuration

Proxyimplementationisset-upbymodifyingconfigurationfile.Currently,besidesofdefaultbehavior,HibernateandNo-Proxymodesaresupported.Forthefulllistoftheimplementations,seethelistofcom.github.dozermapper.core.util.DozerProxyResolverinterfaceimplementations.ThelistcouldberetrievedfromJavaDocs.

Incaseyoudonotmapproxiedobjects-useNoProxyresolver,whichimposesminimumperformanceoverhead.

CustomScenarios

Forcustomscenariositispossibletoprovideyourownimplementationofcom.github.dozermapper.core.util.DozerProxyResolverinterface.Itisconfiguredinthesamewayasthestandardclasses.

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http://cglib.sourceforge.net/

http://www.csg.is.titech.ac.jp/~chiba/javassist/

CustomConvertersCustomconvertersareusedtoperformcustommappingbetweentwoobjects.IntheConfigurationblock,youcanaddsomeXMLtotellDozertouseacustomconverterforcertainclassAandclassBtypes.WhenacustomconverterisspecifiedforaclassAandclassBcombination,Dozerwillinvokethecustomconvertertoperformthedatamappinginsteadofthestandardmappinglogic.

Yourcustomconvertermustimplementthecom.github.dozermapper.core.CustomConverterinterfaceinorderforDozertoacceptit.Otherwiseanexceptionwillbethrown.

Customconvertersaresharedacrossmappingfiles.ThismeansthatyoucandefinethemonceinamappingfileanditwillbeappliedtoallclassmappingsinothermappingfilesthatmatchtheClassA-ClassBpattern.Intheexamplebelow,wheneverDozercomesacrossamappingwherethesrc/destclassmatchthecustomconverterdefinition,itwillinvokethecustomconverterclassinsteadofperformingthetypicalmapping.

<?xmlversion="1.0"encoding="UTF-8"?><mappingsxmlns="http://dozermapper.github.io/schema/bean-mapping"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://dozermapper.github.io/schema/bean-mappinghttp://dozermapper.github.io/schema/bean-mapping.xsd"><configuration><custom-converters><convertertype="com.github.dozermapper.core.converters.TestCustomConverter"><class-a>com.github.dozermapper.core.vo.CustomDoubleObject</class-a><class-b>java.lang.Double</class-b></converter><convertertype="com.github.dozermapper.core.converters.TestCustomHashMapConverter"><class-a>com.github.dozermapper.core.vo.TestCustomConverterHashMapObject</class-a><class-b>com.github.dozermapper.core.vo.TestCustomConverterHashMapPrimeObject</class-b></converter></custom-converters></configuration></mappings>

Customconverterscanalsobespecifiedattheindividualfieldlevel.Intheexamplebelow,Dozerwillinvokethecustomconvertertoperformthefieldmapping.

<mapping><class-a>com.github.dozermapper.core.vo.SimpleObj</class-a><class-b>com.github.dozermapper.core.vo.SimpleObjPrime2</class-b><fieldcustom-converter="com.github.dozermapper.core.converters.StringAppendCustomConverter"><a>field1</a>field1Prime</field></mapping>

Customconverter'instances'canbereusedattheindividualfieldlevel.Intheexamplebelow,Dozerwillinvokethecustomconvertertoperformthefieldmapping.

<mapping><class-a>com.github.dozermapper.core.vo.SimpleObj</class-a><class-b>com.github.dozermapper.core.vo.SimpleObjPrime2</class-b>

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<fieldcustom-converter-id="CustomConverterWithId"><a>field1</a>field1Prime</field></mapping>

CustomConverterinstancescanbeprovidedduringconfigurationofMapperviaDozerBeanMapperBuilder#withCustomConverter(..)method.

<?xmlversion="1.0"encoding="UTF-8"?><beansdefault-lazy-init="false"><beanid="com.github.dozermapper.core.Mapper"class="com.github.dozermapper.core.DozerBeanMapper"><propertyname="mappingFiles"><list><value>dozerBeanMapping.xml</value><value>injectedCustomConverter.xml</value></list></property><propertyname="customConvertersWithId"><map><entrykey="CustomConverterWithId"ref="configurableConverterBeanInstance1"/><entrykey="CustomConverterWithId2"ref="configurableConverterBeanInstance2"/></map></property></bean></beans>

Samplecustomconverterimplementation:

Note:CustomConvertersgetinvokedwhenthesourcevalueisnull,soyouneedtoexplicitlyhandlenullvaluesinyourcustomconverterimplementation.

importcom.github.dozermapper.core.CustomConverter;importcom.github.dozermapper.core.MappingException;

publicclassTestCustomConverterimplementsCustomConverter{

@OverridepublicObjectconvert(ObjectexistingDestinationFieldValue,ObjectsourceFieldValue,Class<?>destinationClass,Class<?>sourceClass){if(sourceFieldValue==null){returnnull;}

CustomDoubleObjectdest;if(sourceinstanceofDouble){//checktoseeiftheobjectalreadyexistsif(destination==null){dest=newCustomDoubleObject();}else{dest=(CustomDoubleObject)destination;}

dest.setTheDouble(((Double)source).doubleValue());

returndest;}elseif(sourceinstanceofCustomDoubleObject){doublesourceObj=((CustomDoubleObject)source).getTheDouble();returnnewDouble(sourceObj);}else{thrownewMappingException("ConverterTestCustomConverter"+"usedincorrectly.Argumentspassedinwere:"+destination+"and"+source);

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}}}

CustomConverterscanalsobeinjectedintotheMapperifyouneedtodosomemanipulationwiththembeforetheyareusedindozer.

<?xmlversion="1.0"encoding="UTF-8"?><beansdefault-lazy-init="false"><beanid="com.github.dozermapper.core.Mapper"class="com.github.dozermapper.core.DozerBeanMapper"><propertyname="mappingFiles"><list><value>dozerBeanMapping.xml</value><value>injectedCustomConverter.xml</value></list></property><propertyname="customConverters"><list><refbean="customConverterTest"/></list></property></bean><beanid="customConverterTest"class="com.github.dozermapper.core.converters.InjectedCustomConverter"><propertyname="injectedName"><value>injectedName</value></property></bean></beans>

SupportforArrayTypes

YoucanspecifyacustomconverterforArraytypes.Forexample,ifyouwanttouseacustomconverterformappingbetweenanarrayofobjectsandaStringyouwouldusethefollowingmappingnotation.DozergenericallyusesClassLoader.loadClass()whenparsingthemappingfiles.Forarrays,javaexpectstheclassnameinthefollowingformat:[Lcom.github.dozermapper.core.vo.SimpleObj;

<convertertype="com.github.dozermapper.core.converters.StringAppendCustomConverter"><class-a>[Lcom.github.dozermapper.core.vo.SimpleObj;</class-a><class-b>java.lang.String</class-b></converter>

Supportforprimitives

Youcanspecifyacustomconverterforprimitivetypes.Justusetheprimitivewrapperclasswhendefiningthecustomconvertermapping.Inthefollowingexample,DozerwillusethespecifiedcustomconverterwhenmappingbetweenSomeObjectandtheintprimitivetype.NotethatDozerwillalsousethecustomconverterwhenmappingbetweenSomeObjectandtheIntegerwrappertype.

<convertertype="somePackage.SomeCustomConverter"><class-a>somePackage.SomeObject</class-a><class-b>java.lang.Integer</class-b></converter>

ConfigurableCustomConverters

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Youcandefineacustomconverter,whichcanbeconfiguredfrommappingsviaconfigurationparameter.InthiscaseyoushouldimplementConfigurableCustomConverterinterfaceinsteadofusualCustomConverter.Configurableconverterhasadditionalattributeprovidedinruntime-param.Parameterisprovidedusingcustom-converter-paramattribute.

<mapping><class-a>com.github.dozermapper.core.vo.BeanA</class-a><class-b>com.github.dozermapper.core.vo.BeanB</class-b><fieldcustom-converter="com.github.dozermapper.core.converters.MathOperationConverter"custom-converter-param="+"><a>amount</a>amount</field></mapping>

Configurablecustomconvertershouldbeusedwhenyouhavesimilarbehaviourinmanycases,whichcanbeparametrized,butthenumberofcombinationsistoohightodosimpleCustomConvertersubclassing.

importcom.github.dozermapper.core.ConfigurableCustomConverter;importcom.github.dozermapper.core.MappingException;

publicclassMathOperationConverterimplementsConfigurableCustomConverter{

privateStringparameter;

@OverridepublicvoidsetParameter(Stringparameter){this.parameter=parameter;}

@OverridepublicObjectconvert(ObjectexistingDestinationFieldValue,ObjectsourceFieldValue,Class<?>destinationClass,Class<?>sourceClass){Integersource=(Integer)sourceFieldValue;Integerdestination=(Integer)existingDestinationFieldValue;

if("+".equals(parameter)){returndestination.intValue+source.intValue();}

if("-".equals(parameter)){returndestination.intValue-source.intValue();}

thrownewMappingException("ConverterMathOperationConverter"+"usedincorrectly.Argumentspassedinwere:"+destination+","+source+"and"+parameter);}}

NewCustomConverterAPI

WhileprovidinggreatdealofflexibilityCustomConverterAPIdescribedaboveiswrittenonfairlylowlevelofabstraction.Thisresultsinconverter,whichcodeisdifficulttounderstandandtoreuseinotherwaysthanpluggingintoDozermapping.Howeveritisnotuncommonsituationwhenthesameconversionlogicshouldbecalledfromaplaceotherthanbeanmappingframework.versionofDozergetsshippedwithnew-cleanerAPIfordefiningcustomconverter,whichgivesyoumoreobviousAPIwhiletakingawaycertainpartofcontroloftheexecutionsflow.Thefollowingexampledemonstratessimple,yetworkingconverterusingnewAPI.

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importcom.github.dozermapper.core.DozerConverter;

publicclassNewDozerConverterextendsDozerConverter<String,Boolean>{

publicNewDozerConverter(){super(String.class,Boolean.class);}

@OverridepublicBooleanconvertTo(Stringsource,Booleandestination){if("yes".equals(source)){returnBoolean.TRUE;}elseif("no".equals(source)){returnBoolean.FALSE;}thrownewIllegalStateException("Unknownvalue!");}

@OverridepublicStringconvertFrom(Booleansource,Stringdestination){if(Boolean.TRUE.equals(source)){return"yes";}elseif(Boolean.FALSE.equals(source)){return"no";}thrownewIllegalStateException("Unknownvalue!");}}

NotethatJava5Genericsaresupportedandyoudonotneedtocastsourceobjecttodesiredtypeaspreviously.

DataStructureConversions

Therearecaseswhereitisrequiredtoperformprogrammaticdatastructureconversion,saycopyeachoddelementinalistasmapkey,buteachevenasmapvalue.InthiscaseitisneededtodefinetransformationofthestructurewhilerelyingonusualDozermappingsupportforindividualvalues.ForthispurposesitispossibletouseMapperAwareinterface,whichinjectscurrentmapperinstanceinsidecustomconverter.

importjava.util.HashMap;importjava.util.List;importjava.util.Map;

importcom.github.dozermapper.core.DozerConverter;importcom.github.dozermapper.core.Mapper;importcom.github.dozermapper.core.MapperAware;

publicclassConverterextendsDozerConverter<List,Map>implementsMapperAware{

privateMappermapper;

publicConverter(){super(List.class,Map.class);}

@OverridepublicvoidsetMapper(Mappermapper){this.mapper=mapper;}

@OverridepublicMapconvertTo(Listsource,Mapdestination){MaporiginalToMapped=newHashMap();for(Sourceitem:source){TargetmappedItem=mapper.map(item,Target.class);

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originalToMapped.put(item,mappedItem);}returnoriginalToMapped;}

@OverridepublicListconvertFrom(Mapsource,Listdestination){thrownewIllegalStateException("Notimplemented");}}

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57

CustomBeanFactoriesYoucanconfigureDozertousecustombeanfactoriestocreatenewinstancesofdestinationdataobjectsduringthemappingprocess.BydefaultDozerjustcreatesanewinstanceofanydestinationobjectsusingadefaultconstructor.Thisissufficientformostusecases,butifyouneedmoreflexibilityyoucanspecifyyourownbeanfactoriestoinstantiatethedataobjects.

Yourcustombeanfactorymustimplementthecom.github.dozermapper.core.BeanFactoryinterface.BydefaulttheDozermappingenginewillusethedestinationobjectclassnameforthebeanidwhencallingthefactory.

publicinterfaceBeanFactory{publicObjectcreateBean(Objectsource,ClasssourceClass,StringtargetBeanId,BeanContainerbeanContainer);}

Next,inyourDozermappingfile(s)youjustneedtospecifyabean-factoryxmlattributeforanymappingsthatyouwanttouseacustomfactory.

Inthefollowingexample,theSampleCustomBeanFactorywillbeusedtocreateanynewinstancesoftheInsideTestObjectPrimejavabeandataobject.

<mapping><class-a>com.example.vo.InsideTestObject</class-a><class-bbean-factory="com.example.factories.SomeCustomBeanFactory">com.example.vo.InsideTestObjectPrime</class-b></mapping>

Ifyourfactorylooksupbeansbasedonadifferentidthanclassname,youcanspecifyafactory-bean-idxmlattribute.Atruntimethespecifiedfactory-bean-idwillbepassedtothefactoryinsteadofclassname.

<mapping><class-a>com.example.vo.InsideTestObject</class-a><class-bbean-factory="com.example.factories.SomeCustomBeanFactory"factory-bean-id="someBeanLookupId">com.example.vo.InsideTestObjectPrime</class-b></mapping>

SpecifyingDefaultFactories

Alternatively,beanfactoriescanbespecifiedinthedefaultconfigurationsectionofanyDozermappingfile(s).Thedefaultfactorywouldbeusedforanymappingsinthatfile.

<configuration><stop-on-errors>true</stop-on-errors><wildcard>true</wildcard><bean-factory>com.example.factories.SomeDefaultBeanFactory</bean-factory></configuration>

Beanfactoriescanalsobespecifiedatthemappinglevel.Thespecifiedfactorywouldbeusedforclass-aandclass-b.

<mappingbean-factory="com.example.factories.SomeCustomBeanFactory"><class-a>com.example.vo.TestObject</class-a>

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<class-b>com.example.vo.TestObjectPrime</class-b></mapping>

Springbeanfactoryinjection

BeanfactoriescanbeinjectedviaSpringorsimilarinversionofcontroltechniques.

<beans><beanid="com.github.dozermapper.core.Mapper"class="com.github.dozermapper.core.DozerBeanMapper"><propertyname="mappingFiles"><list><value>dozerBeanMapping.xml</value></list></property><propertyname="factories"><map><entrykey="com.github.dozermapper.core.factories.SampleCustomBeanFactory"><refbean="sampleCustomBeanFactory"/></entry></map></property></bean><beanid="sampleCustomBeanFactory"class="com.github.dozermapper.core.factories.SampleCustomBeanFactory"/></beans>

BydefiningyourfactoriesasSpringbeansyoucantheninjectthemintotheMapperinstance.

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CustomCreateMethodsYoucanconfigureDozertousecustomstaticcreatemethodstocreatenewinstancesofdestinationdataobjectsduringthemappingprocess.Thiscaneitherbesetatthefieldlevelorclasslevel.

<mapping><class-acreate-method="someCreateMethod">com.github.dozermapper.core.vo.InsideTestObject</class-a><class-b>com.github.dozermapper.core.vo.InsideTestObjectPrime</class-b><field><a>label</a>labelPrime</field></mapping>

SpecifyingacustomcreatemethodattheFieldlevel….

<mapping><class-a>com.github.dozermapper.core.vo.TestObject</class-a><class-b>com.github.dozermapper.core.vo.TestObjectPrime</class-b><field><a>createMethodType</a><bcreate-method="someCreateMethod">createMethodType</field></mapping>

Itisalsopossibletoreferencedifferentclasswithstaticfactorymethod.Thisisdonebyprovidingfullyqualifiedtypenameandmethodnameseparatedbydot.

<bcreate-method="com.github.dozermapper.core.factory.Factory.create">field

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Mappingafieldwithnoget()orset()methods

Usetheattributeis-accessibletodeclarethatthefieldcanbeaccesseddirectly.Dozerisabletoaccessprivatepropertiesthatdonothavegetterorsettermethods.

<field><a>fieldAccessible</a><bis-accessible="true">fieldAccessible</field>

CustomSet()andGet()methods(bi-directional)

Forthosebeansthatmighthaveunorthodoxgetterandsettermethods,Dozersupportuserspecifiedsetterandgettermethods.Tomakeabi-directionalmappinginthiscase,lookatthefollowingexamplebelow.ThesourcefieldinelementAspecifiesacustomsettermethodandgettermethodusingattributes.

<field><aset-method="placeValue"get-method="buildValue">value</a>value</field>

InthiscasewearemappingaStringtoanArrayListbycallingtheaddIntegerToList()method.Notethatthisisdefinedasaone-wayfieldtypesincewecannotmapanArrayListtoaString.

<fieldtype="one-way"><a>integerStr</a><bset-method="addIntegerToList">integerList</field>

OverloadedSet()methods(bi-directional)

Sometimesset()methodscanbeoverloaded.Inordertochosethecorrectoneyoucanaddtheclasstypeasaparameter.

<field><a>overloadGetField</a><bset-method="setOverloadSetField(java.util.Date)">overloadSetField</field>

IterateMethodMapping(bi-directional)

Dozeralsosupportsiteratemethodlevelmapping.InthefollowingexampletheListappleComputerswillbeiteratedthroughandforeachobjectthemethodaddComptuerwillbecalled.Anyfieldthatisdenotedastype=iteraterequiresahint.Theget()methodcanreturnanArray,List,orIterator.

<field><a>appleComputers</a><bset-method="addComputer"type="iterate">computers


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<b-hint>com.github.dozermapper.core.vo.AppleComputer</b-hint></field>

Belowisanexamplewithiteratemethodsonbothfields.

<field><aset-method="addCar"get-method="myIterateCars"type="iterate">iterateCars</a><bset-method="addIterateCar"type="iterate">iterateCars<a-hint>com.github.dozermapper.core.vo.Car</a-hint><b-hint>com.github.dozermapper.core.vo.Car</b-hint></field>


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ExpressionLanguage

Usage

Dozerprovidesoptionalsupportforstandardjavaexpressionlanguage(javax.el).

Currentsupportforexpressionsisstart-uptimeonly.Expressionsarenotresolvedduringeachmapping,butratherduringmappingloadingtime.EachattributeornodevaluecancontainavalidELexpression${}.

DozersupportsanyELimplementationwrittenagainstjavax.elstandardAPI.Functionalityistestedwith'glassfish'internally,butotherELprovidersshouldworkaswell.

Youcandefineglobalvariablesforthemapperinvariablesconfigurationblock.

<configuration><wildcard>true</wildcard><variables><variablename="type_name">com.github.dozermapper.core.sample.MyType</variable></variables></configuration><mapping><class-a>${type_name}</class-a><class-b>com.github.dozermapper.core.sample.OtherType</class-b></mapping>

Enabling

ELsupportisanoptionalfeature.Toenableit,youmustaddthebelowdependenciestoyourclasspath:

<dependency><groupId>javax.el</groupId><artifactId>javax.el-api</artifactId><version>3.0.0</version></dependency><dependency><groupId>org.glassfish</groupId><artifactId>javax.el</artifactId><version>3.0.0</version></dependency>

ItisthisenabledontheMapperbythebelowfluentconstruct:

Mappermapper=DozerBeanMapperBuilder.create().withMappingFiles(mappingFiles).withELEngine(newDefaultELEngine()).build();

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LoggingTheloggingfacadeframeworkinDozerisSLF4J.ItreplacedCommonsLogging,whichwasusedinprojectpreviouslyuntilversion5.3.

PleaserefertoSLF4JDocumentationformoreinformationonsettingupandconfiguringdifferentloggingimplementations.

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64

http://www.slf4j.org/

http://www.slf4j.org/docs.html

EventListeningByimplementingtheEventListenerinterfacedozerallowsyoutolistento4differentevents:

mappingStarted

mappingFinished

preWritingDestinationValue

postWritingDestinationValue

AnEventobjectispassedintothesecallbackmethodswhichstoresinformationabouttheClassMap,FieldMap,sourceobject,destinationobject,anddestinationvalue.ThiswillallowyoutoextendDozerandmanipulatemappedobjectsatrun-time.Theinterfaceisshownbelow:

publicinterfaceEventListener{

publicvoidonMappingStarted(Eventevent);

publicvoidonPreWritingDestinationValue(Eventevent);

publicvoidonPostWritingDestinationValue(Eventevent);

publicvoidonMappingFinished(Eventevent);}

ThelistenersthatyoucreatecanbeinjectedintotheMapperusinganIOClikeSpringorsetdirectlyduringMapperinstanceconfigurationusingDozerBeanMapperBuilder#withEventListener(..)method.BelowisanexampleusingSpringtoinjectaneventlistener:

<?xmlversion="1.0"encoding="UTF-8"?><beansdefault-lazy-init="false"><beanid="EventMapper"class="com.github.dozermapper.core.DozerBeanMapper"><propertyname="mappingFiles"><list><value>dozerBeanMapping.xml</value></list></property><propertyname="eventListeners"><list><refbean="eventTestListener"/></list></property></bean><beanid="eventTestListener"class="com.github.dozermapper.core.event.EventTestListener"/></beans>

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QueryingmappingmetadataThissectionwillcoverthemappingmetadatainterface.Itprovideseasytouseread-onlyaccesstoallimportantpropertiesoraspectsofthecurrentlyactivemappingdefinitions.

Thefollowingsectionswillgivesomecodeexampleshowtousethemappingqueryinterfaces.Themostimportantinterfaceinthewholeprocessiscom.github.dozermapper.core.metadata.MappingMetadata.AninstancecanbeacquiredbycallingthegetMappingMetadata()methodoftheMapperinstance.

Considerthefollowingmappingfile:

<?xmlversion="1.0"encoding="UTF-8"?><mappingsxmlns="http://dozermapper.github.io/schema/bean-mapping"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://dozermapper.github.io/schema/bean-mappinghttp://dozermapper.github.io/schema/bean-mapping.xsd"><mapping><class-a>com.github.dozermapper.core.vo.ClassA</class-a><class-b>com.github.dozermapper.core.vo.ClassB</class-b><field><a>fieldA</a>fieldB</field></mapping></mappings>

Tobeginqueryingthemappingdefinitionsthefollowingcodeisneeded:

Mappermapper=DozerBeanMapperBuilder.create().withMappingFiles(listOfFiles).build();MappingMetadatamapMetadata=mapper.getMappingMetadata();

NowthatareferencetoMappingMetadataisobtainedwecanstartqueryingforacertainclassmappingdefinition:

try{ClassMappingMetadataclassMappingMetadata=mapMetadata.getClassMapping(ClassA.class,ClassB.class);}catch(MetadataLookupExceptione){//couldn'tfindit}

WhenholdingareferencetoaClassMappingMetadatainterface,queriesforindividualfieldmappingscanbeexecuted:

try{FieldMappingMetadatafieldMetadata=classMetadata.getFieldMappingBySource("fieldA");//Destination:fieldBSystem.out.println("Destination:"+fieldMetadata.getDestinationName());}catch(MetadataLookupExceptione){//couldn'tfindit}

ForextensivedocumentationonthedifferentinterfacespleaserefertotheJavaDoc.


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67

SpringFrameworkIntegrationWeprovidethedozer-spring4forintegratingspringapplication.IfyouareusingApacheMaven,simplycopy-pastethisdependencytoyourproject.

pom.xml

<dependency><groupId>com.github.dozermapper</groupId><artifactId>dozer-core</artifactId><version>{dozer-version}</version></dependency><dependency><groupId>com.github.dozermapper</groupId><artifactId>dozer-spring4</artifactId><version>{dozer-version}</version></dependency>

Configuration

AddtheDozerBeanMapperFactoryBeantoyourSpringconfigurationfile.ThemappingFilespropertyiswhereyoushouldspecifyanycustomdozermappingfilesthatyouhavecreated.Thislistcanbeemptyifyoudon’thaveanycustommappings.Itisalsopossibletosetcustomeventlistenersandbeanfactories.

Important

YoushoulddefinetheDozermapperbeanisdefinedassingleton="true".YoushouldconfiguretheMapperinstance(s)thiswaysothatyoudonothavetoreloadandreinitializethemappingfilesforeachindividualmappingduringthelifecycleofyourapp.Reinitializingthemappingfilesforeachmappingwouldbeinefficientandunnecessary.TheDozerBeanMapperclassisthreadsafe.

XMLbasedconfiguration

NotethatthisFactoryBeansupportsSpringResources,whichmeansthatyoucouldloadmappingXmlfilesbyclasspathmaskforexample.

<beanid="dozerMapper"class="com.github.dozermapper.spring.DozerBeanMapperFactoryBean"><propertyname="mappingFiles"value="classpath*:/*mapping.xml"/><propertyname="customConverters"><list><beanclass="com.github.dozermapper.core.converters.CustomConverter"/></list></property><propertyname="eventListeners"><list><beanclass="com.github.dozermapper.core.listeners.EventListener"/></list></property><propertyname="factories"><map><entrykey="id"value-ref="bean-factory-ref"/></map></property></bean>

Alternatively,youcandefinetheDozerBeanMapperusingthedozernamespaceasfollow:

<beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:dozer="http://dozermapper.github.io/schema/dozer-spring"

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xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://dozermapper.github.io/schema/dozer-springhttps://dozermapper.github.io/schema/dozer-spring.xsd">

<dozer:mapperid="dozerMapper"/>

</beans>

Javabasedconfiguration

WhenusingJavaconfiguration,beandefinitionisasfollows:

@ConfigurationpublicclassDozerConfig{@BeanpublicDozerBeanMapperFactoryBeandozerMapper(ResourcePatternResolverresourcePatternResolver)throwsIOException{DozerBeanMapperFactoryBeanfactoryBean=newDozerBeanMapperFactoryBean();factoryBean.setMappingFiles(resourcePatternResolver.getResources("classpath*:/*mapping.xml"));//...returnfactoryBean;}}

Howtouseinyourapplication

UsingSpringtoretrievetheDozerMapper……

Look-upbasedusage

YoucanusetheDozerMapperthatlookedupfromtheSpringApplicationContext(BeanFactory).

MapperdozerMapper=applicationContext.getBean("dozerMapper",Mapper.class);DestinationObjectdestObject=dozerMapper.map(sourceObject,DestinationObject.class);

Injectionbasedusage

Alternatively,youcanusetheDozerMapperthatinjectedtoyourcomponentbySpringDIcontainer.

@ComponentpublicclassYourComponent{privatefinalMapperdozerMapper;publicYourComponent(MapperdozerMapper){this.dozerMapper=dozerMapper;}publicvoidanyMethod(){//...DestinationObjectdestObject=dozerMapper.map(sourceObject,DestinationObject.class);//...}}

HowtouseinSpringBootApplication

PleaseseeSpringBootIntegrationsection.

SpringIntegration

69

SpringIntegration

70

SpringBootIntegrationWeprovidethedozer-spring-boot-starterforintegratingspringbootapplicationsince6.2.0.IfyouareusingApacheMaven,simplycopy-pastethisdependencytoyourproject.

Note FordetailsforSpringFramewrokIntegration,pleaseseehere.

pom.xml

<dependency><groupId>com.github.dozermapper</groupId><artifactId>dozer-spring-boot-starter</artifactId><version>{dozer-version}</version></dependency>

Youcanspecifyanycustomdozermappingfilesinyourapplicationpropertiesoryml.

application.properties

dozer.mapping-files=classpath*:/*mapping.xml

application.yml

dozer:mapping-files:classpath*:/*mapping.xml

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3rdPartyObjectFactoriesDozersupportsmappingofplainJavaobjectstoframeworksthatrequireinstantiationofobjectsviacertainconventionofcallingfactorymethods.Toreproducetheexpectedbehaviorcustombeanfactoriesshouldbeused.

MappingJAXBObjects

DozerhassupportformappingPOJOstoJAXBobjects.UsetheJAXBBeanFactoryforanyJAXBobjectsyouwantcreate.

<mapping><class-a>com.github.dozermapper.core.vo.TestObject</class-a><class-bbean-factory="com.github.dozermapper.core.factory.JAXBBeanFactory">com.github.dozermapper.core.vo.jaxb.employee.Employee</class-b><field><a>name</a>firstName</field><field><a>street</a>address.street</field></mapping>

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FrequentlyAskedQuestions

Common

Whattypesofdataobjectsaresupported?

WillDozerautomaticallyperformdatatypeconversions?

DoesDozerautomaticallymapfieldswithmatchingpropertynames?

IsDozerrecursive?

Willthegetterandsettermethodsbeinvokedwhenfieldsaremapped?

AreCollectionsandArrayssupported?

AreMaptypeobjects(i.eHashMap)supported?

Areabstractclasses,inheritance,andinterfacemappingsupported?

CanDozerbeconfiguredviaSpring?

WhichtypesofdatamappingsdoIneedacustomxmlmappingdefinitionfor?

Ifmysrcanddestobjecthaveallmatchingattributenames,doIneedtospecifyanyxmlmappingdefinitionsatall?

Formappingsthatrequireanxmlmappingdefinition,isthemappingdefinitionbi-directional,ordoIneed2xmldefinitionsifIneedtomapthetwoobjectsbothways?

Howarethecustomxmlmappingfilesloaded?

CanIloadamappingfilethatisnotintheclasspath?

HowcanItellifDozerisinitializingcorrectlyandloadingmyxmlmappingfiles?

HowdoesDozerperform?

WhichJDKversionsaresupported?

IsDozerinthemavenrepository?

IsDozergoodfortheenvironment?

Advanced

CanIimplementcustommappinglogicbetween2datatypesandhaveDozerinvokethiscustomlogicwhenit’sperformingmappings?

CanImaponefieldintoanotherfieldthatisnestednlayersdeepinthedestinationobject?

HowdoImapmultiplefieldstoasinglefield?

IfIammappingdataobjectsthathavebi-directionalrelationships,willitresultinaninfiniteloopandeventualstackoverflowerror?

HowdoImapanobjectcontainedinacollectiontoafield?

HowdoImapaComplexobjecttoaHashMapandviceversa?

HowdoImapfieldsthatdon’thavecorrespondinggetter/settermethods?

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Someofmydataobjectsdon’thavepublicconstructors.DoesDozersupportthisusecase?

DoesDozersupportJDK1.5enums?

DoesDozersupportJAXBgenerateddataobjects?

IsthereanEclipsepluginorvisualeditorforDozer?

Whenmappingcollections,howdoItellDozerwhattypeofdataobjectsIwantinthedestinationcollection?

HowcanItellDozertobypassmappingnulloremptystringvalues?

Tips,Tricks,andSuggestions

ShouldIencapsulatelogicthatcopiesdatabetweenobjects?

ShouldIwriteunittestsfordatamappinglogicthatIuseDozertoperform?

ShouldtheDozermapperbeconfiguredasaSingleton?

Isitbettertohave1largexmlmappingfileortohavemultiplesmallermappingfiles?

WhatarethebestwaystodebugDozer?

Whatisthebestwaytosetuptheglobalconfiguration?

Whatisthebestwaytosubmitabug,featurerequest,orpatch?

Answers

Whattypesofdataobjectsaresupported?

Dozerusesreflectiontoaccessdataobjectproperties,soitisdesignedtoworkwithdataobjectsthathavecorrespondinggetterandsettermethodsforitsfields.Forexample,adataobjectthathasafieldnamed"message"shouldhavegetMessageandsetMessagemethods.Dataobjectsthatdon’tfollowthispatternarealsosupported,butwillmostlikelyrequireacustommappingdefinition.Fortheseunorthodoxdataobjects,youcantellDozertodirectlyaccessfields(includingprivate)and/orexplicitlyspecifywhichget/setmethodstouse.

WillDozerautomaticallyperformdatatypeconversions?

Yes.Mostscenariosaresupportedoutofthebox.Theseincludeprimitives,JavaWrapperObjects,Numbersubclasses,Dates,Calendar,Collections,Arrays,Maps,andComplextypes

DoesDozerautomaticallymapfieldswithmatchingpropertynames?

Yes.Allfieldswithmatchingpropertynamesareimplicitlymapped.Itwouldbeatypicalusage,butyoucouldsuppressthisbehaviorbysettingwilcard="false".

IsDozerrecursive?

Yes.Dozerrecursivelymapstheentireobjectgraphforallfields.

Willthegetterandsettermethodsbeinvokedwhenfieldsaremapped?

Yes.Youcanbypassthisdefaultbehaviorbyexplicitlyspecifyingis-accessible="true"foranyofyourmappings.Ifis-accessibleisspecified,thefield(includingprivatefields)isaccesseddirectlyandthegetter/settermethodsarebypassed.Itisnotrecommendedthatyousetis-accessible="true",unlessyouaredealingwithanunorthodoxdata

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objectthatdoesnotcontainanygetterorsettermethods.

AreCollectionsandArrayssupported?

Yes.Dozerautomaticallymapsbetweencollectiontypesandautomaticallyperformsanytypeconversion.

AreMaptypeobjects(i.eHashMap)supported?

Yes.AllJavaMapdatatypesaresupportedinadditiontoanyCustommapdatatypes.

Areabstractclasses,inheritance,andinterfacemappingsupported?

Yes.

CanDozerbeconfiguredviaSpring?

Yes.RefertoSpringIntegrationsectionofthedocumentation.

WhichtypesofdatamappingsdoIneedacustomxmlmappingdefinitionfor?

Onlyfieldsthatcan’tbeimplicitlymappedbymatchingonfieldname,needacustomxmlmappingdefinition.Ideally,thevastmajorityofyourfieldmappingscanbeperformedautomaticallyandonlythefewexceptionalcaseswillneedanexplicitfieldmappinginthexmlmappingfile.

Ifmysrcanddestobjecthaveallmatchingattributenames,doIneedtospecifyanyxmlmappingdefinitionsatall?

Nope.Justinvokethemapper.Youdon’tneedanyexplicitxmlmappingentriesforthiscombinationofsourceanddestinationobject.

Formappingsthatrequireanxmlmappingdefinition,isthemappingdefinitionbi-directional,ordoIneed2xmldefinitionsifIneedtomapthetwoobjectsbothways?

Allmappingdefinitionsarebi-directional,soyouonlyneedonemappingdefinition.Youcanmapa-→bandb-→ausingthissinglemappingdefinition.

Howarethecustomxmlmappingfilesloaded?

Dozerwillsearchtheentireclasspathlookingforthespecifiedfile(s).

CanIloadamappingfilethatisnotintheclasspath?

Yes,youcanloadfilesfromoutsidetheclasspathbyprepending"file:"totheresourcename.Ex)"file:c:\somedozermapping.xml"

HowcanItellifDozerisinitializingcorrectlyandloadingmyxmlmappingfiles?

Setthe-Ddozer.debugsystemproperty.Ifthisisset,DozerinitializationinformationisalsosenttoSystem.out.Ifyouarefamiliarwithlog4j,thisissimilartothe-Dlog4j.debugsystemproperty

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HowdoesDozerperform?

WebelieveDozerperformsverywellandperformanceisahighpriorityforus.Wehavespentasignificantamountoftimeprofilingthecodeandoptimizingbottlenecks.

Performanceisgoingtodependonthecomplexityoftheusecaseandthenumberoffieldsmapped.Inourperformancetestsfor"average"mappingscenarios,theclassmappingtimesvaryfrom1/8ofamillisecondto2milliseconds.Thisroughlyequatesto50-450fieldmappingspermillisecond.However,thenumberofvariablesinanydecentbenchmarkmakesitalmostimpossibletotransfertheseresultsintoreasonableconclusionsabouttheperformanceofyourownapplication.Yourapplicationisdifferentandyouwillhaveuniqueusecases.

Dozerhasbeensuccessfullyimplementedonlarge,veryhightransactionalenterprisesystems,withoutanyresultingperformanceissues.Butwealwaysrecommendthatyourunperformancetestsonyourapplicationtodeterminetheactualperformancecostswithinyoursystem.Youcandecideforyourselfwhetherthosecostsareacceptableinthecontextoftheentiresystem.

WhichJDKversionsaresupported?

JDK1.8andabove.

IsDozerinthemavenrepository?

YesandwewillcontinuetodoourbesttogetfuturereleasesofDozeruploadedintotherepository.

<dependency><groupId>com.github.dozermapper</groupId><artifactId>dozer-core</artifactId><version>{dozer-version}</version></dependency>

IsDozergoodfortheenvironment?

Yes,dozerdoesnotburnanyfossilfuelsandiswithintheEPA’srecommendedemissions.

CanIimplementcustommappinglogicbetween2datatypesandhaveDozerinvokethiscustomlogicwhenit’sperformingmappings?

Yes.AveryusefulfeatureprovidedbyDozeristheconceptofcustomconverters.Customconvertersareusedtoperformcustommappingbetweentwoobjects.IntheConfigurationblock,youcanaddsomeXMLtotellDozertouseacustomconverterforcertainclassAandclassBtypes.WhenacustomconverterisspecifiedforaclassAandclassBcombination,Dozerwillinvokethecustomconvertertoperformthedatamappinginsteadofthestandardmappinglogic.

<custom-converters><convertertype="com.github.dozermapper.core.converters.SomeCustomConverter"><class-a>com.github.dozermapper.core.vo.SomeCustomDoubleObject</class-a><class-b>java.lang.Double</class-b></converter></custom-converters>

CanImaponefieldintoanotherfieldthatisnestednlayersdeepinthedestinationobject?

Yes.Dozersupportsdotnotationfornestedfields.Aswithotherdozerfieldmappings,thesearebi-directional.

FAQ

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<field><a>someNestedObj.someOtherNestedObj.someField</a>someOtherField</field>

HowdoImapmultiplefieldstoasinglefield?

Dozerdoesn’tcurrentlysupportthis.Andbecauseofthecomplexitiesaroundimplementingit,thisfeatureisnotcurrentlyontheroadmap.Apossiblesolutionwouldbetowrapthemultiplefieldsinacustomcomplextypeandthendefineacustomconverterformappingbetweenthecomplextypeandthesinglefield.Thisway,youcouldhandlethecustomlogicrequiredtomapthethreefieldsintothesingleonewithinthecustomconverter.

IfIammappingdataobjectsthatcontainbi-directionalrelationships,willitresultinaninfiniteloopandeventualstackoverflowerror?

No.Dozerhasbuiltinlogicthatpreventsinfiniteloopsforbi-directionaldataobjectrelationships

HowdoImapanobjectcontainedinacollectiontoafield?

Youwoulduseindexedbasedmapping.

<field><a>usernames[0]</a>username1</field>

HowdoImapaComplexobjecttoaHashMapandviceversa?

Youcanmapentirecomplexobjectsdirectlytoajava.util.Mapandviceversa.Whendoingthisyouneedtoexplicitlydefineauniquemap-idforthemapping.Thisisusedwhendeterminingwhichmaptouseatrun-time.Everyattributeonthecomplextypewillbemappedtothejava.util.Map.YouDONOTneedtoexplicitlydefinethesemappings.Iftheattributenameisnotthesameasthemapkeyjustsetthekeyattributeforacustomfieldmapping.

<mappingmap-id="myTestMapping"><class-a>com.github.dozermapper.core.vo.map.SomeComplexType</class-a><class-b>java.util.Map</class-b><field><a>stringProperty2</a><bkey="myStringProperty">this</field></mapping>

HowdoImapfieldsthatdon’thavecorrespondinggetter/settermethods?

YoucantellDozertodirectlyaccessfields(includingprivatefields)byspecifyingis-accessible="true"

<field><a>fieldA</a><bis-accessible="true">fieldB</field>

Someofmydataobjectsdon’thavepublicconstructors.DoesDozersupportthisusecase?

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77

Yes.Whencreatinganewinstanceofthedestinationobjectifapublicno-argconstructorisnotfound,Dozerwillautodetectaprivateconstructorandusethat.Ifthedataobjectdoesnothaveaprivateconstructor,youcanspecifyacustomBeanFactoryforcreatingnewinstancesofthedestinationobject.

DoesDozersupportJDK1.5enums?

Yes.EnumtoEnummappingisautomaticallyhandled.

DoesDozersupportJAXBgenerateddataobjects?

DozerhassupportformappingPOJOstoJAXBobjects.UsetheJAXBBeanFactoryforanyJAXBobjectsyouwantcreated.

IsthereanEclipsepluginorvisualeditorforDozer?

No,butwethinkitwouldbeagreataddition.Itwouldbeverypowerfultobeabletographicallymap2objectsandhavethecustomxmldefinitionsautogenerated,alongwithbeingabletovisuallyviewamappingdefinition.Ifanyonehasexpertiseincreatingeclipsepluginsandisinterestedonworkingonthisfeature,pleaseletusknow!

Whenmappingcollections,howdoItellDozerwhattypeofdataobjectsIwantinthedestinationcollection?

Hintsaresupportedtohandlethisusecase.HintsarenotrequiredifyouareusingJDK1.5GenericsbecausethetypescanbeautodetectedbyDozer.Butifyouarenotusinggenerics,toconvertaCollection/ArraytoaCollection/ArraywithdifferenttypeobjectsyoucanspecifyaHinttoletDozerknowwhattypeofobjectsyouwantcreatedinthedestinationlist.IfaHintisnotspecifiedforthedestinationfield,thenthedestinationCollectionwillbepopulatedwithobjectsthatarethesametypeastheelementsinthesrcCollection.

<field><a>someList</a>otherList<b-hint>com.github.dozermapper.core.vo.TheFirstSubClassPrime</b-hint></field>

HowcanItellDozertobypassmappingnulloremptystringvalues?

Youcanbypassthemappingofnullvaluesbyspecifyingmap-null="false".Ifthisisspecified,thedestfieldmappingisbypassedatruntimeandthedestinationvaluesettermethodwillnotbecalledifthesrcvalueisnull.Thiscanbespecifiedatthemappingorclasslevel.

YoucanbypassthemappingofemptyStringvaluesbyspecifyingmap-empty-string="false".Ifthisisspecified,thedestfieldmappingisbypassedatruntimeandthedestinationvaluesettermethodwillnotbecalledifthesrcvalueisanemptyString.Thiscanbespecifiedatthemappingorclasslevel

ShouldIencapsulatelogicthatcopiesdatabetweenobjects?

Itisouropinionthatyoushould.RegardlessofwhetheryouuseDozertoperformdatamappingbetweenobjects,webelievethisisagooddesignpatternthatpromotesreuse,encapsulatestheunderlyingimplementation,andmakesthecodeunittestableinisolation.These"Assembler"interfacesencapsulatethelogicthatisresponsiblefortakingasrcobjectandmappingthedataintoadestobject.Usingassemblertypeofclassesgivesyoutheflexibilityofbeingabletomodifytheunderlyingmappingimplementationwithoutimpactingclientsorthecontract.OneotherimportantbenefitofusingAssemblersisthatitmakeswritingunittestsspecificforthemappingaloteasierandmorefocused.Ifyoueverneedtodetermineifaparticularbugisduetomappingofobjects,itissimpletowriteanAssemblerunittest

FAQ

78

thatreproducestheusecase.Ifyouencapsulateyourdatamappinglogic,youcoulduseDozerformostofmappingsandifyouhavearealcornercase,youhavetheflexibilitytohandcodemappingsforanyobjectsorfields.Forexample,youcouldrunyourmappingthroughDozertomap99%ofyourfieldsandthenhaveamanualmappingforsomeoddballfield.ThiswouldhappenallwithintheAssemblerwithouttheclienthavinganyknowledgeoftheunderlyingimplementation.

Itseemstoworkbestiftheseassemblertypeofclassesare"dumb"andareonlyresponsibleforsimplycopyingdatafromthesourceobjectintothedestinationobject.Anycomplexpostprocessingbusinesslogicthatneedstobeperformedonthedestinationobjectcanbedoneatahigherlevelinclasssesthathavemoreresponsibility.

ThefollowingisasimpleexampleofanassemblertypeclassthatusesDozerforitsunderlyingimplementation.

publicclassSomeAssemblerImplimplementsSomeAssembler{

privateMapperdozerMapper;

publicDestObjectassembleDestObject(SrcObjectsrc){returndozerMapper.map(src,DestObject.class);}

}

ShouldIwriteunittestsfordatamappinglogicthatIuseDozertoperform?

Absolutely.Andofcourse,westronglyrecommendwritingtheunittest(s)first.Evenifyoudon’tuseDozertoperformthedatamappingbetweentwoobjects,thislogicstillneedsisolatedunittests.Datamappinglogic(especiallyhandcoded)iserrorproneandhavingaunittestisinvaluable.Typicallymappingbetweentwoobjectsisrequiredinmultipleareasofasystem,soafocusedunittestofthecentralmappinglogicenablesyoutotestthedatamappinglogicinisolation.Thegreatthingaboutencapsulatingdatamappinglogicandhavingunittestsforthelogicisthatyoucaneasilyswitchouttheunderlyingimplementation.

ForexistingsystemsthatarewantingtomigratetoDozer,werecommendfirstencapsulatinganyexistinghandcodeddatamappingintoanassemblertypeofclassandwriteunittestsforit.ThenswitchoutthehandcodedmappinglogicwithDozerandtheunittestswillbeyoursafetynet.ThemigrationtoDozercanbeincrementalandthisisprobablythebeststrategyforexisitingsystems.

RegardlessofwhetherornotyouuseDozer,unittestingdatamappinglogicistediousandanecessaryevil,butthereisatrickthatmayhelp.Ifyouhaveanassemblerthatsupportsmapping2objectsbi-directionally,inyourunittestyoucandosomethingsimilartothefollowingexample.Thisalsoassumesyouhavedoneagoodjobofimplementingtheequals()methodforyourdataobjects.Theideaisthatifyoumapasourceobjecttoadestinationobjectandthenbackagain,theoriginalsrcobjectshouldequaltheobjectreturnedfromthelastmappingiffieldsweremappedcorrectly.Inthetestcase,youshouldpopulateallthepossiblefieldsintheoriginalsourceobjecttoensurethatallofthefieldsareaccountedforinthemappinglogic.

publicvoidtestAssembleSomeObject()throwsException{SrcObjectsrc=newSrcObject();src.setSomeField("somevalue");src.setSomeOtherField("makesureyousetallthesrcfields"+"withvaluessothatyoufullytestthedatamappings");

DestObjectdest=assembler.assembleDestObject(src);SrcObjectmappedSrc=assermbler.assembleSrcObject(dest);

assertEquals("fieldsnotmappedcorrectly",src,mappedSrc);}

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Itisalsogoodpracticetoverifythatyourassemblerhandlesnullvaluesproperly.Inthefollowingtestcasenoneofthesourcefieldsarepopulated.Iftheassemblerdoesn’tproperlyhandlenullvalues,anexceptionwillbethrownwhentheassemblerisinvoked.

publicvoidtestAssembleSomeObject_NullValues()throwsException{SrcObjectsrc=newSrcObject();

DestObjectdest=assembler.assembleDestObject(src);SrcObjectmappedSrc=assermbler.assembleSrcObject(dest);

assertEquals("fieldsnotmappedcorrectly",src,mappedSrc);}

ShouldtheDozermapperbeconfiguredasaSingleton?

Yes.Mapperinstancesshouldbereusedasmuchaspossible.ForeveryinstanceoftheMapper,themappingfilesareloadedandparsed.YoushouldconfiguretheMapperonceforyourconfigurationandreusethisinstancethroughoutyourapplication.TheMapperimplementationsarethreadsafe.

Isitbettertohave1largexmlmappingfileortohavemultiplesmallermappingfiles?

Werecommendcomponentizingyourmappingfilesinsteadofhaving1largemappingfile.

WhatarethebestwaystodebugDozer?

Youcanspecifythe-Ddozer.debugsystempropertytoviewtheonetimeinitializationinformation.Youwillseeoutputsimilartothefollowing….

dozer:TryingtofindDozerconfigurationfile:dozer.propertiesdozer:UsingURL[file:/local/subversion_projects/dozer/trunk/target/test-classes/dozer.properties]forDozerglobalpropertyconfigurationdozer:ReadingDozerpropertiesfromURL[file:/local/subversion_projects/dozer/trunk/target/test-classes/dozer.properties]dozer:FinishedconfiguringDozerglobalpropertiesdozer:InitializingDozer.Version:${project.version},ThreadName:maindozer:Initializinganewinstanceofthedozerbeanmapper.dozer:Usingthefollowingxmlfilestoloadcustommappingsforthebeanmapperinstance:[fieldAttributeMapping.xml]dozer:Tryingtofindxmlmappingfile:fieldAttributeMapping.xmldozer:UsingURL[file:/local/subversion_projects/dozer/trunk/target/test-classes/fieldAttributeMapping.xml]toloadcustomxmlmappingsdozer:SuccessfullyloadedcustomxmlmappingsfromURL:[file:/local/subversion_projects/dozer/trunk/target/test-classes/fieldAttributeMapping.xml]

Todebugindividualfieldmappingsbetweenclasses,setthelogginglevel"com.github.dozermapper.core.MappingProcessor=DEBUG".Forexample,ifyouareusinglog4jyouwouldaddthefollowingentrytoyourlog4jconfigurationfile"log4j.category.com.github.dozermapper.core.MappingProcessor=DEBUG".ThiswillshowyoueveryfieldmappingthatDozerperformsalongwiththeactualsourceanddestinationvalues.Youwillseeoutputsimilartothefollowing….

MAPPED:SimpleObj.field1-->SimpleObjPrime.field1VALUES:one-->oneMAPID:someMapIdMAPPED:SimpleObj.field2-->SimpleObjPrime.field2VALUES:2-->2MAPID:someMapIdMAPPED:SimpleObj.field3-->SimpleObjPrime.field3VALUES:3-->3MAPID:someMapIdMAPPED:SimpleObj.field4-->SimpleObjPrime.field4VALUES:44.44-->44.44MAPID:someMapIdMAPPED:SimpleObj.field6-->SimpleObjPrime.field6VALUES:

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80

66-->66MAPID:someMapId

Whatisthebestwaytosetuptheglobalconfiguration?

Werecommendhavingaseparatemappingxmlfileforglobalconfiguration.Youcouldnameitsomethingsimilartodozer-global-configuration.xml.Sampleglobalconfigurationfile……

<?xmlversion="1.0"encoding="UTF-8"?><mappingsxmlns="http://dozermapper.github.io/schema/bean-mapping"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://dozermapper.github.io/schema/bean-mappinghttp://dozermapper.github.io/schema/bean-mapping.xsd"><configuration><stop-on-errors>true</stop-on-errors><date-format>MM/dd/yyyyHH:mm</date-format><wildcard>false</wildcard><custom-converters><convertertype="com.github.dozermapper.core.converters.TestCustomConverter"><class-a>com.github.dozermapper.core.vo.CustomDoubleObject</class-a><class-b>java.lang.Double</class-b></converter></custom-converters></configuration></mappings>

Whatisthebestwaytosubmitabug,featurerequest,orpatch?

Wevalueyoursuggestionsandappreciateeveryonethattakesthetimetosubmitasupportrequest.PleasesubmitallrequestsviaDozer’sGitHubprojectpage

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https://github.com/DozerMapper/dozer

ExamplesTherearesomesamplemappingfilesunder\{dozer.home}/src/test/resources.ThesemappingfilesareusedbytheDozerunittests.

Examples

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Migrationfromv5.5.1tov6.0.0Seeforreleasenotes.

1.JDK<1.8supportdropped

DozerisbuiltagainstJavaJDK1.8ONLY.

2.MavenGAV(GroupID,ArtifactandVersion)haschanged:

From:

<dependency><groupId>net.sf.dozer</groupId><artifactId>dozer</artifactId><version>5.5.1</version></dependency>

To:


3.dozer-osgidropped

Younolongerneedtousethebelow,ifyouarerunninginanOSGienvironment:

<dependency><groupId>net.sf.dozer</groupId><artifactId>dozer-osgi</artifactId><version>5.5.1</version></dependency>

Justsimplyusethedozer-core:


v5tov6

83

https://github.com/DozerMapper/dozer/releases/tag/v6.0.0

1.Mapping.xmlXSDchanged:

From:

<mappingsxmlns="http://dozer.sourceforge.net"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://dozer.sourceforge.nethttp://dozer.sourceforge.net/schema/beanmapping.xsd">

To:

<mappingsxmlns="http://dozermapper.github.io/schema/bean-mapping"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://dozermapper.github.io/schema/bean-mappinghttps://dozermapper.github.io/schema/bean-mapping.xsd">

2.Dozer-SpringXSDchanged.

From:

<beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:dozer="http://dozer.sourceforge.net/schema/dozer-spring"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-4.3.xsdhttp://dozer.sourceforge.net/schema/dozer-springhttp://dozer.sourceforge.net/schema/dozer-spring.xsd">

To:

<beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:dozer="http://dozermapper.github.io/schema/dozer-spring"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-4.3.xsdhttp://dozermapper.github.io/schema/dozer-springhttps://dozermapper.github.io/schema/dozer-spring.xsd">

3.DozerBeanMapperusageisdeprecated

DirectinstantiationofDozerBeanMapperaswellasitsusageisdeprecated.Thisclasswillbehiddeninversion6.2.PleaseuseMapperwheneveryouneedtomap,andDozerBeanMapperBuildertoconfigurethemapper.

Deprecated:

DozerBeanMappermapper=newDozerBeanMapper();mapper.addMapping(myMappingBuilder);mapper.setMappingFiles(myFiles);

mapper.map(a,b);

Recommended:

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84

https://github.com/DozerMapper/dozer/releases/tag/6.1.0

Mappermapper=DozerBeanMapperBuilder.create().withMappingBuilder(myMappingBuilder).withMappingFiles(myFiles).build();

mapper.map(a,b);

4.DozerBeanMapperSingletonWrapperisdeprecated

DozerBeanMapperSingletonWrapperisdeprecatedandplannedforremovalinversion6.2.

DozerprojectdoesnotadvisetouseJVMsingletons.PleaseuseyourDIcontainertomanagesingleinstanceoftheMapperifrequired.ThefollowingcodecanbeusedtocreateaMapperwithdefaultconfiguration:

Mappermapper=DozerBeanMapperBuilder.buildDefault();

5.InternalAPIischanged

DozerismovingawayfromhavingJVM-globalstate.ThismeansthatsomeinternalAPIlikeBeanContainerisnotavailableanymoreviasingletonreferences,i.e.BeanContainer.getInstance()doesnotexist.Ifyouwereusingthisoranyothercodethatisreworked,pleaseletusknow.MostlikelyyoudevelopedDozerModule.Wewouldliketoknowmoreaboutreal-worldusecasestobuildconvenientpublicAPIformodulesdevelopers.

6.org.dozer.BeanFactoryinterfacechanges

Oldsignatureoforg.dozer.BeanFactoryisdeprecatedandwillberemovedinversion6.2.Pleaseusenewmethodofthisinterfacewhencreatingcustombeanfactories.

Deprecated:

ObjectcreateBean(Objectsource,Class<?>sourceClass,StringtargetBeanId)

Recommended:

ObjectcreateBean(Objectsource,Class<?>sourceClass,StringtargetBeanId,BeanContainerbeanContainer)

7.Deprecatedstatsandjmx

Deprecated:

org.dozer.statsorg.dozer.jmx

8.Updateddozer-protopackagename

From:

org.dozer

To:

com.github.dozermapper.protobuf

v6.0.0tov6.1.0

85

9.Updateddozer-springpackagename

From:

org.dozer.spring

To:

com.github.dozermapper.spring

v6.0.0tov6.1.0

86

1.JMX/Statshasbeenremoved

Asper6.1.0migrationdocs,JMXandStatsweredeprecated.Theyhavenowbeenfullyremoved.

2.dozer.propertieskeyschanged

From:

dozer.cache.converter.by.dest.type.maxsizedozer.cache.super.type.maxsizeorg.dozer.util.DozerClassLoaderorg.dozer.util.DozerProxyResolver

To:

dozer.cache.converter-by-dest-type-maxsizedozer.cache.super-type-maxsizedozer.beans.class-loader-beandozer.beans.proxy-resolver-bean

3.SupportforYAML,SystemPropertiesandEnvironmentvariables

Asaswellasdozer.properties,wealsosupportseveralnewimplementations,suchasYAML,see:-https://github.com/DozerMapper/dozer/tree/6.2.0/core/src/main/java/org/dozer/config/resolvers-https://github.com/DozerMapper/dozer/tree/6.2.0/core/src/main/java/org/dozer/config/processors

4.dozer.el.enabledisdeprecated

Thepropertyfor'dozer.el.enabled'hasbeendeprecated.Instead,youshoulduse:

DefaultELEngineelEngine=newDefaultELEngine();Mappermapper=DozerBeanMapperBuilder.create().withMappingFiles(mappingFiles).withElementReader(newExpressionElementReader(elEngine)).withELEngine(elEngine).build();

5.Springmavenartifactnamehaschanged

From:

<dependency><groupId>com.github.dozermapper</groupId><artifactId>dozer-spring</artifactId><version>6.1.0</version></dependency>

To:

v6.1.0tov6.2.0

87


https://github.com/DozerMapper/dozer/tree/6.2.0/core/src/main/java/org/dozer/config/resolvers

https://github.com/DozerMapper/dozer/tree/6.2.0/core/src/main/java/org/dozer/config/processors

<dependency><groupId>com.github.dozermapper</groupId><artifactId>dozer-spring4</artifactId><version>6.2.0</version></dependency>

6.Springmavenartifactnamehaschanged

From:

<dependency><groupId>com.github.dozermapper</groupId><artifactId>dozer-proto</artifactId><version>6.1.0</version></dependency>

To:

<dependency><groupId>com.github.dozermapper</groupId><artifactId>dozer-proto3</artifactId><version>6.2.0</version></dependency>

7.Extendedspringbootsupport

dozer-spring-boot-starteranddozer-spring-boot-autoconfigureartifactsaddedtosupportspringbootautoconfigurationfeatures.

<dependency><groupId>com.github.dozermapper</groupId><artifactId>dozer-spring-boot-starter</artifactId><version>6.2.0</version></dependency>

8.dozer.xml.use-jaxb-mapping-enginetousenewJAXB

ThecurrentDozerXMLtoObjectsimplementationusesorg.w3c.dom.Documenttoparsethemodel.Goingforward,theintentionistouseaJAXBmodel.Thisfeatureisnotenabledbydefault,butcanbevia:

dozer.xml.use-jaxb-mapping-engine=true

v6.1.0tov6.2.0

88

1.Karaf2supportdropped

Askaraf2isnowdeprecatedupstream,andisnotsupportedwithJava9,supportisdropped.

2.ApacheXMLBeanssupportdropped

Asxmlbeansisnowdeprecatedupstream,andisnotsupportedwithJava9,supportisdropped.

3.UberJARnowprovided

MavenGAV

<dependency><groupId>com.github.dozermapper</groupId><artifactId>dozer-core</artifactId><version>6.3.0</version><classifier>jar-with-dependencies</classifier></dependency>

4.dozer.xml.use-jaxb-mapping-engineenabledbydefault

JAXBisusedbydefault,ifthiscausesissues,itcanbedisabledvia:

-Ddozer.xml.use-jaxb-mapping-engine=false

Andthefollowingisdeprecated:

com.github.dozermapper.core.loader.xml

Infavourof:

com.github.dozermapper.core.builder.xml

5.Updateddozer-corepackagename

From:

org.dozer

To:

com.github.dozermapper.core

6.UpdatedDozerEventListenerpackage/classname

From:

v6.2.0tov6.3.0

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org.dozer.DozerEventListener

To:

com.github.dozermapper.core.events.EventListener

v6.2.0tov6.3.0

90

PrerequisitesThePlugincurrentlydependson

WTP3.0.2orlatest

Compatibility

PluginissupportedandbeentestedonthefollowingIDEs

Eclipse3.6

RADRSA8.0.1

Installation

TheDozerPlugin-featurecanbeinstalledandupdatedusingtheEclipseUpdateManager.

AddanewUpdate-URL:

http://dozer.sourceforge.net/eclipse-plugin

Selectallrequireddependenciesandinstalltheplugin.

Alternativelyyoucandownloadthepackageatsourceforgeandunzipitinyoureclipseinstallationfolder.YoumighthavetoenablethePluginafterstartingEclipse.ThiscanbedoneatHelp>SoftwareUpdates>ManageConfiguration.

Afterinstallationisdoneyoushouldseealittlereddozer-icononallyourmapping-xmlfiles.

Installation

91

http://www.eclipse.org/webtools/

http://www.eclipse.org

http://www.ibm.com/developerworks/rational/library/10/whats-new-in-rational-software-architect-8/

https://sourceforge.net/project/showfiles.php?group_id=133517

CreatenewMappingfilesThepluginprovidesasimplewizardforcreatingnewmapping-xmlfiles.Anewmapping-xmlfilecanbecreatedusingFile>New>Other>DozerMappingFramework>DozerMappingFile.Selectthecorrectdozerversion(4,DTDor5,XSD)inthewizardandcreatethefile.

ConfiguretheMapping

viaXML

viatheEditor

Usage

92

OpenmappingfileWhenopeningaDozer-mapping-filetheDozer-editorappears.IfyouwanttoedittherawXMLyoucanswitchtothe"source"view.

ContentAssist

Alltheclass-a/class-b,field,get-method,set-method,etc-nodesor-attributesautomaticlyshowcontent-assistpopupswhenpressingctrl+spaceortheconfiguredWTP-XMLcontentassistcharacters.Thesecanbechangedinthepreferences.

viaXML

93

Alltheclass-a/class-b,field,get-method,set-method,etc-nodesor-attributesautomaticlyshowcontent-assistpopupswhenpressingctrl+spaceortheconfiguredWTP-XMLcontentassistcharacters.Thesecanbechangedinthepreferences.

viaXML

94

Validation

TheDozerPluginvalidatestheMappingtofindoutifthemappedclassdoexistandifthemappedfieldsareaccessible.

viaXML

95

SettingglobaldozerconfigurationAllglobalconfigurationvaluescanbesetinthe"GlobalConfiguration"Tab.

Configuringmappings

Everyclassmappingislistedinthe"Mapping"Tab.MappingsofclassesandfieldscanbeaddedbyPopupmenuortheaction-buttonsatthetop.Ontherightsidethemappingscanbeconfigured.EveryAttributeorElementintheXMLfileisshownforediting.

viaEditor

96

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