android - Mapstruct kotlin 和 @Named 注解

Question

我正在将一些宠物项目从 java 转换为 kotlin，并遇到了一些无法解决的问题。在 java 中，所有编译都很好，但是在转换为 Kotlin 之后就不需要......

...
import org.mapstruct.Mapper
import org.mapstruct.Mapping
import org.mapstruct.Named
...

@Mapper(unmappedTargetPolicy = ReportingPolicy.ERROR)
interface EffectMapper {

    @Mapping(source = "icon", target = "icon", qualifiedByName = ["convertIcon"])
    fun toDS(effectDTO: EffectDTO): EffectDS

    fun toDSarr(effectDTOArrayList: ArrayList<EffectDTO>): ArrayList<EffectDS>

    @Named("convertIcon")
    fun convertIcon(obj: String?): ByteArray? {
        return if (obj != null) {
            Base64.decode(obj, Base64.DEFAULT)
        } else {
            null
        }
    }

    companion object {
        val MAPPER = Mappers.getMapper(EffectMapper::class.java)
    }
}

Gradle返回错误

 error: Can't generate mapping method from non-iterable type to iterable type.
    public abstract byte[] convertIcon(@org.jetbrains.annotations.Nullable()

和

Can't map property "java.lang.String icon" to "byte[] icon". Consider to declare/implement a mapping method: "byte[] map(java.lang.String value)".
    @org.mapstruct.Mapping(source = "icon", target = "icon", qualifiedByName = {"convertIcon"})

和

Can't map property "java.lang.String effect" to "one.codium.funart.DataStructure.effect.Effect effect". Consider to declare/implement a mapping method: "one.codium.funart.DataStructure.effect.Effect map(java.lang.String value)".
    public abstract one.codium.funart.DataStructure.EffectDS toDS(@org.jetbrains.annotations.NotNull()

终于通过这种方式完成了

@Mapper(unmappedTargetPolicy = ReportingPolicy.ERROR, uses = [EffectMapperImpl::class])
interface EffectMapper {

    fun toDS(effectDTO: EffectDTO): EffectDS

    fun toDSarr(effectDTOArrayList: ArrayList<EffectDTO>): ArrayList<EffectDS>

    companion object {
        val MAPPER: EffectMapper = Mappers.getMapper(EffectMapper::class.java)
    }
}

object EffectMapperImpl {

    fun convertIcon(obj: String?): ByteArray? {
        return if (obj != null) {
            Base64.decode(obj, Base64.DEFAULT)
        } else {
            null
        }
    }

    fun toEffect(s: String): Effect {
        return Effect(s)
    }
}

谢谢@Filip

Answer 1

我正在使用 Kotlin 1.3.71-release-431，它与 @JvamDefault 一起工作得很好，所以你只需要在 (java) 中使你的转换方法 (toEffect) 静态。

Mapping(source = "sourceFiledName", target = "destinationFiledName", qualifiedByName = ["converterMethod"])
interface EffectMapper {
  fun toDS(effectDTO: EffectDTO): EffectDS
  
  fun toDSarr(effectDTOArrayList: ArrayList<EffectDTO>): ArrayList<EffectDS>
  
  companion object {
     @JvmStatic
     @Named("converterMethod")
     fun toEffect(s: String): Effect {
        return Effect(s)
      }
  }
}