#3231 Prefer record constructor annotated with @Default

integrationtest/src/test/resources/recordsTest/src/main/java/org/mapstruct/itest/records/Default.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.itest.records;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * @author Filip Hrisafov
+ */
+@Documented
+@Target(ElementType.CONSTRUCTOR)
+@Retention(RetentionPolicy.SOURCE)
+public @interface Default {
+}

integrationtest/src/test/resources/recordsTest/src/main/java/org/mapstruct/itest/records/Task.java

@@ -0,0 +1,15 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.itest.records;
+
+import java.util.List;
+
+/**
+ * @author Oliver Erhart
+ */
+public record Task( String id, Long number ) {
+
+}

integrationtest/src/test/resources/recordsTest/src/main/java/org/mapstruct/itest/records/TaskDto.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.itest.records;
+
+import java.util.List;
+
+/**
+ * @author Oliver Erhart
+ */
+public record TaskDto(String id, Long number) {
+
+    @Default
+    TaskDto(String id) {
+        this( id, 1L );
+    }
+
+}

integrationtest/src/test/resources/recordsTest/src/main/java/org/mapstruct/itest/records/TaskMapper.java

@@ -0,0 +1,22 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.itest.records;
+
+import org.mapstruct.Mapper;
+import org.mapstruct.ReportingPolicy;
+import org.mapstruct.factory.Mappers;
+
+/**
+ * @author Oliver Erhart
+ */
+@Mapper(unmappedTargetPolicy = ReportingPolicy.ERROR)
+public interface TaskMapper {
+
+    TaskMapper INSTANCE = Mappers.getMapper( TaskMapper.class );
+
+    TaskDto toRecord(Task source);
+
+}

integrationtest/src/test/resources/recordsTest/src/test/java/org/mapstruct/itest/records/RecordsTest.java

@@ -83,4 +83,16 @@ public class RecordsTest {
         assertThat( value.isActive() ).isEqualTo( false );
         assertThat( value.premium() ).isEqualTo( true );
     }
+
+    @Test
+    public void shouldUseDefaultConstructor() {
+        Task entity = new Task( "some-id", 1000L );
+
+        TaskDto value = TaskMapper.INSTANCE.toRecord( entity );
+
+        assertThat( value ).isNotNull();
+        assertThat( value.id() ).isEqualTo( "some-id" );
+        assertThat( value.number() ).isEqualTo( 1L );
+    }
+
 }

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

@@ -791,7 +791,23 @@ public class BeanMappingMethod extends NormalTypeMappingMethod {
             }
 
             if ( type.isRecord() ) {
-                // If the type is a record then just get the record components and use then
+
+                List<ExecutableElement> constructors = ElementFilter.constructorsIn( type.getTypeElement()
+                    .getEnclosedElements() );
+
+                for ( ExecutableElement constructor : constructors ) {
+                    if ( constructor.getModifiers().contains( Modifier.PRIVATE ) ) {
+                        continue;
+                    }
+
+                    // prefer constructor annotated with @Default
+                    if ( hasDefaultAnnotationFromAnyPackage( constructor ) ) {
+                        return getConstructorAccessor( type, constructor );
+                    }
+                }
+
+
+                // Other than that, just get the record components and use them
                 List<Element> recordComponents = type.getRecordComponents();
                 List<ParameterBinding> parameterBindings = new ArrayList<>( recordComponents.size() );
                 Map<String, Accessor> constructorAccessors = new LinkedHashMap<>();