Этого можно добиться как с помощью mapper decorator , так и AfterMapping hook .
Decorator
Decorator:
public abstract class MapperDecorator implements Mapper {
private final Mapper delegate;
public MapperDecorator(Mapper delegate) {
this.delegate = delegate;
}
@Override
public Parent parent2ToParent(Parent2 entity) {
Parent parent = delegate.parent2ToParent(entity);
if (entity.getChildren() == null) {
parent.setChildren(null);
}
return parent;
}
}
Mapper:
@org.mapstruct.Mapper
@DecoratedWith(MapperDecorator.class)
public interface Mapper {
@Mapping(source = "entity.children.children", target = "children")
Parent2 parentToParent2(Parent entity);
@InheritInverseConfiguration
Parent parent2ToParent(Parent2 entity);
Child2 childToChild2(Child entity);
Child child2ToChild(Child2 entity);
}
AfterMapping
Mapper:
@org.mapstruct.Mapper
public abstract class Mapper {
@Mapping(source = "entity.children.children", target = "children")
public abstract Parent2 parentToParent2(Parent entity);
@InheritInverseConfiguration
public abstract Parent parent2ToParent(Parent2 entity);
public abstract Child2 childToChild2(Child entity);
public abstract Child child2ToChild(Child2 entity);
@AfterMapping
public void afterParent2ToParent(Parent2 source,
@MappingTarget Parent target) {
if (source.getChildren() == null) {
target.setChildren(null);
}
}
}