Java Can';t让MapStruct使用枚举继承&@塔格提普
以下是我的示例设置:Java Can';t让MapStruct使用枚举继承&@塔格提普,java,inheritance,enums,mapstruct,targettype,Java,Inheritance,Enums,Mapstruct,Targettype,以下是我的示例设置: interface EnumMessage { boolean carrier(String message); String getValue(); default String getMessage() { return getValue().toUpperCase(); } } enum EnumMessageA implements EnumMessage { GREAT("You are doing great"
interface EnumMessage {
boolean carrier(String message);
String getValue();
default String getMessage() {
return getValue().toUpperCase();
}
}
enum EnumMessageA implements EnumMessage {
GREAT("You are doing great"),
GOOD("You are doing good"),
OK("You are doing ok");
private String value;
EnumMessageA(final String value) {
this.value = value;
}
@Override
public String getValue() {
return value;
}
@Override
public boolean carrier(final String message) {
return this.value.equals(message);
}
}
class SourceX {
public String name;
public String message;
}
class TargetX {
public String name;
public EnumMessageA messageA;
}
@Mapper
interface EnumMapper {
EnumMapper INSTANCE = Mappers.getMapper(EnumMapper.class);
@Mapping(source = "message", target = "messageA", qualifiedByName = "stringToEnum")
TargetX toTarget(SourceX source);
@Mapping(source = "messageA", target = "message", qualifiedByName = "enumToString")
SourceX toSource(TargetX target);
@Named("stringToEnum")
default <T extends EnumMessage> T mapStringToEnum(
final String message, @TargetType final Class<T> enumClass) {
final T[] values = enumClass.getEnumConstants();
return Arrays.stream(values)
.filter(enumValue -> enumValue.carrier(message))
.findFirst()
.orElse(null);
}
@Named("enumToString")
default <T extends EnumMessage> String mapEnumToString(final T enumValue) {
return enumValue.getMessage();
}
}
我尝试使用或不使用qualifiedByName
,但无法让MapStruct使用mapStringToEnum
方法
我不确定这是否是MapStruct在使用@TargetType
时不使用枚举继承的错误,或者我遗漏了什么
- 使用
时,会出现编译时错误:@映射(source=“message”,target=“messageA”,qualifiedByName=“stringToEnum”)
- 使用
或使用resultType@Mapping(source=“message”,target=“messageA”)
时,生成的实现会忽略提供的方法@Mapping(source=“message”,target=“messageA”,resultType=EnumMessage.class
注意:我不能使用
@BeforeMapping/@AfterMapping
,因为我有许多要映射的枚举类型,因此需要寻找隐式或通用的解决方案。解决了这个问题,并且在MapStruct团队的帮助下引发了一个错误
要使其正常工作,必须满足以下条件:
qualifiedByName
属性当然是必需的,即使我将通用签名更改为
@Mapper
public class EnumMapperHelper {
@Named("stringToEnum")
public static <T extends EnumMessage> T mapStringToEnum(
final String message, @TargetType final Class<T> enumClass) {
final T[] values = enumClass.getEnumConstants();
return Arrays.stream(values)
.filter(enumValue -> enumValue.carrier(message))
.findFirst()
.orElse(null);
}
@Named("enumToString")
//this doesn't have to be static but yes the @Qualifier is required
public static <T extends EnumMessage> String mapEnumToString(final T enumValue) {
return enumValue.getMessage();
}
}
@Mapper(uses = EnumMapperHelper.class)
interface EnumMapper {
EnumMapper INSTANCE = Mappers.getMapper(EnumMapper.class);
@Mapping(source = "message", target = "messageA", qualifiedByName = "stringToEnum")
TargetX toTarget(SourceX source);
@Mapping(source = "messageA", target = "message", qualifiedByName = "enumToString")
SourceX toSource(TargetX target);
}
@Mapper
公共类EnumMapperHelper{
@命名(“stringToEnum”)
公共静态T mapStringToEnum(
最终字符串消息,@TargetType最终类enumClass){
最终T[]值=enumClass.getEnumConstants();
返回Arrays.stream(值)
.filter(enumValue->enumValue.carrier(消息))
.findFirst()
.orElse(空);
}
@命名(“枚举字符串”)
//这不必是静态的,但需要@Qualifier
公共静态字符串mapEnumToString(最终Enumt值){
返回enumValue.getMessage();
}
}
@映射器(uses=EnumMapperHelper.class)
接口枚举映射器{
EnumMapper实例=Mappers.getMapper(EnumMapper.class);
@映射(source=“message”、target=“messageA”、qualifiedByName=“stringToEnum”)
TargetX toTarget(源X源);
@映射(source=“messageA”,target=“message”,qualifiedByName=“enumToString”)
SourceX-toSource(TargetX-target);
}
error: Qualifier error. No method found annotated with @Named#value: [ stringToEnum ]. See https://mapstruct.org/faq/#qualifier for more info.
@Mapping(source = "message", target = "messageA", qualifiedByName = "stringToEnum")
error: Can't map property "String message" to "EnumMessageA messageA". Consider to declare/implement a mapping method: "EnumMessageA map(String value)".
@Mapping(source = "message", target = "messageA", qualifiedByName = "stringToEnum")
class EnumMapperImpl implements EnumMapper {
@Override
public TargetX toTarget(SourceX source) {
if ( source == null ) {
return null;
}
TargetX targetX = new TargetX();
if ( source.message != null ) {
targetX.messageA = Enum.valueOf( EnumMessageA.class, source.message );
}
targetX.name = source.name;
return targetX;
}
@Override
public SourceX toSource(TargetX target) {
if ( target == null ) {
return null;
}
SourceX sourceX = new SourceX();
sourceX.message = mapEnumToString( target.messageA );
sourceX.name = target.name;
return sourceX;
}
}
@Mapper
public class EnumMapperHelper {
@Named("stringToEnum")
public static <T extends EnumMessage> T mapStringToEnum(
final String message, @TargetType final Class<T> enumClass) {
final T[] values = enumClass.getEnumConstants();
return Arrays.stream(values)
.filter(enumValue -> enumValue.carrier(message))
.findFirst()
.orElse(null);
}
@Named("enumToString")
//this doesn't have to be static but yes the @Qualifier is required
public static <T extends EnumMessage> String mapEnumToString(final T enumValue) {
return enumValue.getMessage();
}
}
@Mapper(uses = EnumMapperHelper.class)
interface EnumMapper {
EnumMapper INSTANCE = Mappers.getMapper(EnumMapper.class);
@Mapping(source = "message", target = "messageA", qualifiedByName = "stringToEnum")
TargetX toTarget(SourceX source);
@Mapping(source = "messageA", target = "message", qualifiedByName = "enumToString")
SourceX toSource(TargetX target);
}