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Add generics support #273

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2 changes: 1 addition & 1 deletion build.gradle
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Original file line number Diff line number Diff line change
Expand Up @@ -76,7 +76,7 @@ licenseFormat.dependsOn licenseFormatForKotlin
licenseTest.dependsOn licenseTestData

checkstyle {
toolVersion = '8.36.1'
toolVersion = '10.12.0'

@maybetm maybetm Aug 4, 2026

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Checkstyle 8.36.1 cannot parse Java pattern-matching switch expressions (used in resolvedType()), e.g.:

Output before up version

MapstructSourceReference.java:138:17: unexpected token: psiType

config = resources.text.fromUri("https://raw.githubusercontent.com/mapstruct/mapstruct/master/build-config/src/main/resources/build-config/checkstyle.xml")
configProperties = [
'checkstyle.cache.file': layout.buildDirectory.get().asFile.toPath( ).resolve( 'checkstyle-cachefile').toString(),
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5 changes: 5 additions & 0 deletions src/main/java/org/mapstruct/intellij/codeinsight/references/MapstructBaseReference.java
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Expand Up @@ -60,6 +60,11 @@ public String getValue() {
return super.getValue();
}

@Nullable
public MapstructBaseReference getPrevious() {
return this.previous;
}

@Nullable
@Override
public final PsiElement resolve() {
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38 changes: 25 additions & 13 deletions src/main/java/org/mapstruct/intellij/codeinsight/references/MapstructSourceReference.java
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Expand Up @@ -6,6 +6,7 @@
package org.mapstruct.intellij.codeinsight.references;

import java.util.Objects;
import java.util.Optional;
import java.util.stream.Stream;

import com.intellij.codeInsight.lookup.LookupElement;
Expand All @@ -23,6 +24,7 @@
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.mapstruct.intellij.util.MapstructUtil;
import org.mapstruct.intellij.util.SourceUtils;

import static org.mapstruct.intellij.util.MapstructUtil.asLookup;
import static org.mapstruct.intellij.util.MapstructUtil.findRecordComponent;
Expand Down Expand Up @@ -133,21 +135,31 @@ Object[] getVariantsInternal(@NotNull PsiMethod mappingMethod) {
@Override
PsiType resolvedType() {
PsiElement element = resolve();

if ( element instanceof PsiMethod psiMethod ) {
return psiMethod.getReturnType();
}
else if ( element instanceof PsiParameter psiParameter ) {
return psiParameter.getType();
}
else if ( element instanceof PsiRecordComponent psiRecordComponent ) {
return psiRecordComponent.getType();
}
else if ( element instanceof PsiField psiField ) {
return psiField.getType();
PsiType elementType = switch ( element ) {
case PsiMethod psiMethod -> psiMethod.getReturnType();
case PsiParameter psiParameter -> psiParameter.getType();
case PsiRecordComponent psiRecordComponent -> psiRecordComponent.getType();
case PsiField psiField -> psiField.getType();
case null, default -> null;
};

if ( elementType == null ) {
return null;
}

return null;
PsiType contextType = Optional.ofNullable( getPrevious() )
.map( MapstructBaseReference::resolvedType )
.or( () -> Optional.ofNullable( this.getMappingMethod() )
.map( MapstructUtil::getSourceParameters )
.filter( params -> params.length == 1 )
.map( psiParameters -> psiParameters[0] )
.map( SourceUtils::getParameterType )
)
.orElse( null );

return PsiUtil.resolveGenericsClassInType( contextType )
.getSubstitutor()
.substitute( elementType );
}

/**
Expand Down
35 changes: 21 additions & 14 deletions src/main/java/org/mapstruct/intellij/codeinsight/references/MapstructTargetReference.java
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Expand Up @@ -7,6 +7,7 @@

import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Stream;

import com.intellij.codeInsight.AnnotationUtil;
Expand All @@ -27,7 +28,6 @@
import com.intellij.psi.util.PsiUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.mapstruct.Mapping;
import org.mapstruct.intellij.util.MapStructVersion;
import org.mapstruct.intellij.util.MapstructUtil;
import org.mapstruct.intellij.util.TargetType;
Expand Down Expand Up @@ -203,21 +203,28 @@ Object[] getVariantsInternal(@NotNull PsiMethod mappingMethod) {
@Override
PsiType resolvedType() {
PsiElement element = resolve();

if ( element instanceof PsiMethod psiMethod ) {
return firstParameterPsiType( psiMethod );
}
else if ( element instanceof PsiParameter psiParameter ) {
return psiParameter.getType();
}
else if ( element instanceof PsiRecordComponent psiRecordComponent ) {
return psiRecordComponent.getType();
}
else if ( element instanceof PsiField psiField ) {
return psiField.getType();
PsiType elementType = switch ( element ) {
case PsiMethod psiMethod -> firstParameterPsiType( psiMethod );
case PsiParameter psiParameter -> psiParameter.getType();
case PsiRecordComponent psiRecordComponent -> psiRecordComponent.getType();
case PsiField psiField -> psiField.getType();
case null, default -> null;
};

if ( elementType == null ) {
return null;
}

return null;
PsiType contextType = Optional.ofNullable( getPrevious() )
.map( MapstructBaseReference::resolvedType )
.or( () -> Optional.ofNullable( getMappingMethod() )
.map( TargetUtils::getRelevantType )
)
.orElse( null );

return PsiUtil.resolveGenericsClassInType( contextType )
.getSubstitutor()
.substitute( elementType );
}

/**
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9 changes: 7 additions & 2 deletions src/test/java/org/mapstruct/intellij/MapstructBaseCompletionTestCase.java
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Expand Up @@ -9,7 +9,6 @@

import com.intellij.codeInsight.completion.LightFixtureCompletionTestCase;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.openapi.vfs.newvfs.impl.VfsRootAccess;
import com.intellij.testFramework.LightProjectDescriptor;
import com.intellij.testFramework.PsiTestUtil;
import com.intellij.util.PathUtil;
Expand All @@ -29,7 +28,13 @@ protected void setUp() throws Exception {
super.setUp();
final String mapstructLibPath = PathUtil.toSystemIndependentName( new File( BUILD_LIBS_DIRECTORY )
.getAbsolutePath() );
VfsRootAccess.allowRootAccess( getTestRootDisposable(), mapstructLibPath );

allowAccessToDirsIfExists(
BUILD_LIBS_DIRECTORY,
"testData",
"build/test-libs"
);

@hduelme hduelme Jul 23, 2026

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Why did you changes this code? I think this could break building on other OS (Windows)

@maybetm maybetm Jul 28, 2026

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I added this specifically to ensure the tests run correctly on Windows. Without these configurations, the testing framework is unable to access packages

@maybetm maybetm Aug 4, 2026

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For example, before fix

14:52:40,037 FINE   .intellij.openapi.command.impl - finishCommand: name = Renaming method setTestName(String) of class org.mapstruct.intellij.test.examples.SimpleMapper.Target to setNewName, groupId = null 
14:52:40,039 SEVERE                 #TestFramework - Test failed 
com.intellij.openapi.vfs.newvfs.impl.VfsRootAccess$VfsRootAccessNotAllowedError: File accessed outside allowed roots: file://D:/projects/github/mapstruct-idea/testData/usages/RenameTargetReferenceAfter.java; 

PsiTestUtil.addLibrary(
myFixture.getProjectDisposable(),
myFixture.getModule(),
Expand Down
109 changes: 109 additions & 0 deletions src/test/java/org/mapstruct/intellij/MapstructCompletionTestCase.java
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Expand Up @@ -488,6 +488,115 @@ public void testFluentGenericTargetMapper() {
);
}

public void testGenericCarWrapperSourceAutoCompleteAfterCar() {
configureByTestName();

assertThat( myItems )
.extracting( LookupElement::getLookupString )
.containsExactlyInAnyOrder(
"winCode"
);

assertThat( myItems )
.extracting( LookupElementPresentation::renderElement )
.usingRecursiveFieldByFieldElementComparator()
.containsExactlyInAnyOrder(
createVariable( "winCode", "String" )
);
}

public void testGenericCarWrapperTargetAutoCompleteAfterCar() {
configureByTestName();

assertThat( myItems )
.extracting( LookupElement::getLookupString )
.containsExactlyInAnyOrder( "winCode" );

assertThat( myItems )
.extracting( LookupElementPresentation::renderElement )
.usingRecursiveFieldByFieldElementComparator()
.containsExactlyInAnyOrder( createVariable( "winCode", "String" ) );
}

public void testGenericCarWrapperSourceAutoCompleteAfterCarWithoutParameterPrefix() {
configureByTestName();

assertThat( myItems )
.extracting( LookupElement::getLookupString )
.containsExactlyInAnyOrder( "winCode" );

assertThat( myItems )
.extracting( LookupElementPresentation::renderElement )
.usingRecursiveFieldByFieldElementComparator()
.containsExactlyInAnyOrder( createVariable( "winCode", "String" ) );
}

public void testGenericConstructorCarMapper() {
configureByTestName();

assertThat( myItems )
.extracting( LookupElement::getLookupString )
.containsExactlyInAnyOrder( "winCode" );

assertThat( myItems )
.extracting( LookupElementPresentation::renderElement )
.usingRecursiveFieldByFieldElementComparator()
.containsExactlyInAnyOrder( createVariable( "winCode", "String" ) );
}

public void testGenericRecordConstructorTargetMapper() {
configureByTestName();

assertThat( myItems )
.extracting( LookupElement::getLookupString )
.containsExactlyInAnyOrder( "winCode" );

assertThat( myItems )
.extracting( LookupElementPresentation::renderElement )
.usingRecursiveFieldByFieldElementComparator()
.usingElementComparatorIgnoringFields( "myIcon", "myTail" )
.containsExactlyInAnyOrder( createParameter( "winCode", "String" ) );
}

public void testGenericConstructorMappingTargetUpdateMapper() {
configureByTestName();

assertThat( myItems )
.extracting( LookupElement::getLookupString )
.containsExactlyInAnyOrder( "winCode" );

assertThat( myItems )
.extracting( LookupElementPresentation::renderElement )
.usingRecursiveFieldByFieldElementComparator()
.containsExactlyInAnyOrder( createVariable( "winCode", "String" ) );
}

public void testGenericTwoTypeParamsConstructorTargetMapper() {
configureByTestName();

assertThat( myItems )
.extracting( LookupElement::getLookupString )
.containsExactlyInAnyOrder( "serial" );

assertThat( myItems )
.extracting( LookupElementPresentation::renderElement )
.usingRecursiveFieldByFieldElementComparator()
.containsExactlyInAnyOrder( createVariable( "serial", "String" ) );
}

public void testGenericNestedGenericTargetMapper() {
configureByTestName();

assertThat( myItems )
.extracting( LookupElement::getLookupString )
.containsExactlyInAnyOrder( "winCode" );

assertThat( myItems )
.extracting( LookupElementPresentation::renderElement )
.usingRecursiveFieldByFieldElementComparator()
.containsExactlyInAnyOrder( createVariable( "winCode", "String" ) );
}

public void testVariantsCarMapperNoSourceClass() {
myFixture.configureByFile( "CarMapperNoSourceClass.java" );
complete();
Expand Down
56 changes: 56 additions & 0 deletions testData/mapping/GenericCarWrapperSourceAutoCompleteAfterCar.java
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@@ -0,0 +1,56 @@
/*
* Copyright MapStruct Authors.
*
* Licensed under the Apache License version 2.0, available at https://www.apache.org/licenses/LICENSE-2.0
*/
package org.mapstruct.ap.test.complex;

import org.mapstruct.Mapper;
import org.mapstruct.Mapping;

@Mapper
public interface GenericCarWrapperMapper {

@Mapping(target = "id", source = "wrapper.car.<caret>winCode")
CarEntity toCarDto(CarWrapper<Car> wrapper);
}

class CarEntity {

private String id;

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

}

class Car {

private String winCode;

public String getWinCode() {
return winCode;
}

public void setWinCode(String winCode) {
this.winCode = winCode;
}
}

class CarWrapper<T> {

private T car;

public T getCar() {
return car;
}

public void setCar(T car) {
this.car = car;
}
}
45 changes: 45 additions & 0 deletions testData/mapping/GenericCarWrapperSourceAutoCompleteAfterCarWithoutParameterPrefix.java
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@@ -0,0 +1,45 @@
/*
* Copyright MapStruct Authors.
*
* Licensed under the Apache License version 2.0, available at https://www.apache.org/licenses/LICENSE-2.0
*/
package org.mapstruct.ap.test.complex;

import org.mapstruct.Mapper;
import org.mapstruct.Mapping;

@Mapper
public interface GenericCarWrapperSourceAutoCompleteAfterCarWithoutParameterPrefix {
@Mapping(target = "id", source = "car.<caret>winCode")
CarEntity toCarDto(CarWrapper<Car> wrapper);
}

class CarEntity {
private String id;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
}

class Car {
private String winCode;
public String getWinCode() {
return winCode;
}
public void setWinCode(String winCode) {
this.winCode = winCode;
}
}

class CarWrapper<T> {
private T car;
public T getCar() {
return car;
}
public void setCar(T car) {
this.car = car;
}
}
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