Mapstruct中的CycleAvaidingMapperContext清理

Question

@Component
public class CycleAvoidingMappingContext {
    private Map<Object, Object> knownInstances = new IdentityHashMap<Object, Object>();

    @BeforeMapping
    public <T> T getMappedInstance(Object source, @TargetType Class<T> targetType) {
        return (T) knownInstances.get( source );
    }

    @BeforeMapping
    public void storeMappedInstance(Object source, @MappingTarget Object target) {
        knownInstances.put( source, target );
    }
}

Answer 1

您引用的示例是mapstruct-mapping-with-cycles的一部分，在这里它没有用作Spring bean。

CycleAvaidingMapperContext的思想是用作@Context属性。

每次将其传递给映射方法时，都将创建一个新实例。