#1828 Use update method when nested property of target is populated with multiple nested properties of source (#1931)

processor/src/main/java/org/mapstruct/ap/internal/model/NestedTargetPropertyMappingHolder.java

@@ -151,6 +151,16 @@ public class NestedTargetPropertyMappingHolder {
                         groupedByTP.singleTargetReferences.get( targetProperty )
                     );
 
+                    // We need an update method in the when one of the following is satisfied:
+                    // 1) Multiple source parameters for the target reference
+                    // 2) Multiple source references for the target reference
+                    // The reason for this is that multiple sources have effect on the target.
+                    // See Issue1828Test for more info.
+                    boolean forceUpdateMethod =
+                        multipleSourceParametersForTP || groupedSourceReferences.groupedBySourceReferences.size() > 1;
+
+                    boolean forceUpdateMethodOrNonNestedReferencesPresent =
+                        forceUpdateMethod || !groupedSourceReferences.nonNested.isEmpty();
                     // For all the groupedBySourceReferences we need to create property mappings
                     // from the Mappings and not restrict on the defined mappings (allow to forge name based mapping)
                     // if we have composite methods i.e. more then 2 parameters then we have to force a creation
@@ -159,8 +169,6 @@ public class NestedTargetPropertyMappingHolder {
                         .groupedBySourceReferences
                         .entrySet() ) {
                         PropertyEntry sourceEntry = entryBySP.getKey();
-                        boolean forceUpdateMethodOrNonNestedReferencesPresent =
-                            multipleSourceParametersForTP || !groupedSourceReferences.nonNested.isEmpty();
                         // If there are multiple source parameters that are mapped to the target reference
                         // then we restrict the mapping only to the defined mappings. And we create MappingOptions
                         // for forged methods (which means that any unmapped target properties are ignored)

processor/src/test/java/org/mapstruct/ap/test/bugs/_1828/CompleteAddress.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._1828;
+
+public class CompleteAddress {
+
+    private String lineOne;
+    private String lineTwo;
+    private String city;
+    private String country;
+
+    public String getLineOne() {
+        return lineOne;
+    }
+
+    public void setLineOne(String lineOne) {
+        this.lineOne = lineOne;
+    }
+
+    public String getLineTwo() {
+        return lineTwo;
+    }
+
+    public void setLineTwo(String lineTwo) {
+        this.lineTwo = lineTwo;
+    }
+
+    public String getCity() {
+        return city;
+    }
+
+    public void setCity(String city) {
+        this.city = city;
+    }
+
+    public String getCountry() {
+        return country;
+    }
+
+    public void setCountry(String country) {
+        this.country = country;
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_1828/Employee.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._1828;
+
+public class Employee {
+
+    private String name;
+    private GeneralAddress generalAddress;
+    private SpecialAddress specialAddress;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public GeneralAddress getGeneralAddress() {
+        return generalAddress;
+    }
+
+    public void setGeneralAddress(GeneralAddress generalAddress) {
+        this.generalAddress = generalAddress;
+    }
+
+    public SpecialAddress getSpecialAddress() {
+        return specialAddress;
+    }
+
+    public void setSpecialAddress(SpecialAddress specialAddress) {
+        this.specialAddress = specialAddress;
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_1828/FirstMapper.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._1828;
+
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.factory.Mappers;
+
+@Mapper
+public interface FirstMapper {
+
+    FirstMapper INSTANCE = Mappers.getMapper( FirstMapper.class );
+
+    @Mapping(target = "completeAddress.lineOne", source = "specialAddress.line1")
+    @Mapping(target = "completeAddress.lineTwo", source = "specialAddress.line2")
+    @Mapping(target = "completeAddress.city", source = "generalAddress.city")
+    @Mapping(target = "completeAddress.country", source = "generalAddress.country")
+    Person mapPerson(Employee employee);
+
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_1828/GeneralAddress.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._1828;
+
+public class GeneralAddress {
+
+    private String city;
+    private String country;
+
+    public String getCity() {
+        return city;
+    }
+
+    public void setCity(String city) {
+        this.city = city;
+    }
+
+    public String getCountry() {
+        return country;
+    }
+
+    public void setCountry(String country) {
+        this.country = country;
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_1828/Issue1828Test.java

@@ -0,0 +1,101 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._1828;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mapstruct.ap.testutil.IssueKey;
+import org.mapstruct.ap.testutil.WithClasses;
+import org.mapstruct.ap.testutil.runner.AnnotationProcessorTestRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Filip Hrisafov
+ */
+@IssueKey("1828")
+@RunWith(AnnotationProcessorTestRunner.class)
+@WithClasses({
+    CompleteAddress.class,
+    Employee.class,
+    FirstMapper.class,
+    GeneralAddress.class,
+    Person.class,
+    SpecialAddress.class,
+})
+public class Issue1828Test {
+
+    @Test
+    public void testMapSpecialAndGeneralAddressSet() {
+
+        Employee employee = new Employee();
+        employee.setName( "Mad King" );
+
+        SpecialAddress specialAddress = new SpecialAddress();
+        specialAddress.setLine1( "Building One" );
+        specialAddress.setLine2( "Street Two" );
+        employee.setSpecialAddress( specialAddress );
+
+        GeneralAddress generalAddress = new GeneralAddress();
+        generalAddress.setCity( "King's Landing" );
+        generalAddress.setCountry( "Seven Kingdom" );
+        employee.setGeneralAddress( generalAddress );
+
+        Person person = FirstMapper.INSTANCE.mapPerson( employee );
+        assertThat( person.getName() ).isEqualTo( "Mad King" );
+
+        CompleteAddress completeAddress = person.getCompleteAddress();
+        assertThat( completeAddress ).isNotNull();
+        assertThat( completeAddress.getLineOne() ).isEqualTo( "Building One" );
+        assertThat( completeAddress.getLineTwo() ).isEqualTo( "Street Two" );
+        assertThat( completeAddress.getCity() ).isEqualTo( "King's Landing" );
+        assertThat( completeAddress.getCountry() ).isEqualTo( "Seven Kingdom" );
+    }
+
+    @Test
+    public void testMapGeneralAddressNull() {
+
+        Employee employee = new Employee();
+        employee.setName( "Mad King" );
+
+        SpecialAddress specialAddress = new SpecialAddress();
+        specialAddress.setLine1( "Building One" );
+        specialAddress.setLine2( "Street Two" );
+        employee.setSpecialAddress( specialAddress );
+
+        Person person = FirstMapper.INSTANCE.mapPerson( employee );
+        assertThat( person.getName() ).isEqualTo( "Mad King" );
+
+        CompleteAddress completeAddress = person.getCompleteAddress();
+        assertThat( completeAddress ).isNotNull();
+        assertThat( completeAddress.getLineOne() ).isEqualTo( "Building One" );
+        assertThat( completeAddress.getLineTwo() ).isEqualTo( "Street Two" );
+        assertThat( completeAddress.getCity() ).isNull();
+        assertThat( completeAddress.getCountry() ).isNull();
+    }
+
+    @Test
+    public void testMapSpecialAddressNull() {
+
+        Employee employee = new Employee();
+        employee.setName( "Mad King" );
+
+        GeneralAddress generalAddress = new GeneralAddress();
+        generalAddress.setCity( "King's Landing" );
+        generalAddress.setCountry( "Seven Kingdom" );
+        employee.setGeneralAddress( generalAddress );
+
+        Person person = FirstMapper.INSTANCE.mapPerson( employee );
+        assertThat( person.getName() ).isEqualTo( "Mad King" );
+
+        CompleteAddress completeAddress = person.getCompleteAddress();
+        assertThat( completeAddress ).isNotNull();
+        assertThat( completeAddress.getLineOne() ).isNull();
+        assertThat( completeAddress.getLineTwo() ).isNull();
+        assertThat( completeAddress.getCity() ).isEqualTo( "King's Landing" );
+        assertThat( completeAddress.getCountry() ).isEqualTo( "Seven Kingdom" );
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_1828/Person.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._1828;
+
+public class Person {
+
+    String name;
+    private CompleteAddress completeAddress;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public CompleteAddress getCompleteAddress() {
+        return completeAddress;
+    }
+
+    public void setCompleteAddress(CompleteAddress completeAddress) {
+        this.completeAddress = completeAddress;
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_1828/SpecialAddress.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._1828;
+
+public class SpecialAddress {
+
+    private String line1;
+    private String line2;
+
+    public String getLine1() {
+        return line1;
+    }
+
+    public void setLine1(String line1) {
+        this.line1 = line1;
+    }
+
+    public String getLine2() {
+        return line2;
+    }
+
+    public void setLine2(String line2) {
+        this.line2 = line2;
+    }
+}