java - Dozer 是否允许从 Enum 转换为 Enum？

Question

2枚举:

enum Source {

    WINTER,
    SPRING,
    SUMMER,
    AUTUMN
}

和

enum Dest {

    WINTER,
    SPRING,
    SUMMER,
    AUTUMN
}

尝试使用 Dozer 将 Source 转换为 Dest:

DozerBeanMapper mapper = new DozerBeanMapper();

mapper.map(Source.WINTER, Dest.class);

Exception in thread "main" org.dozer.MappingException: java.lang.NoSuchMethodException: Dest.< init >()

但是当我尝试转换包含上述枚举的复杂对象时，Dozer 成功地转换了它。

那么，当它们不是复杂对象的属性时，为什么 Dozer 不能将 Enum 转换为 Enum？

Answer 1

Dozer 无法映射枚举，因为它依赖于默认无参数公共(public)构造函数的存在。只有当它们是更大的 POJO 的一部分时，它们才能被映射。例如:

enum Source {

    WINTER,
    SPRING,
    SUMMER,
    AUTUMN
}

public class SourceClass{

  private Source season;

  public Source getSeason() {
    return season;
  }

  public void setSeason(Source season) {
    this.season = season;
  }

}

和

enum Dest {

    WINTER,
    SPRING,
    SUMMER,
    AUTUMN
}

public class DestClass{

  private Dest season;

  public Dest getSeason() {
    return season;
  }

  public void setSeason(Dest season) {
    this.season = season;
  }

}

现在这将起作用:

SourceClass source = new SourceClass();
source.setSeason(Source.AUTUMN);

DestClass dest = mapper.map(source, DestClass.class);