JMapper - 映射双向关系的正确方法

Question

如何使用jMapper映射双向关系的正确方法？

我想使用@JMapConversion注释，但我不能停止无限循环。

这里是我的代码：

public class SourceClass1 { 
    private SourceClass2 sourceClass2; 

    //others attributes, getters and setters 


} 

public class SourceClass2 { 
    private SourceClass1 sourceClass1; 

    //others attributes, getters and setters 

} 

public class DestinationClass1 { 
    private DestinationClass2 destinationClass2; 

    //others attributes, getters and setters 

    @JMapConversion(from="sourceClass2", to="destinationClass2", type=Type.DYNAMIC) 
    public static String destinationClass2Conversion(){ 
     StringBuffer stBuffer = new StringBuffer(); 
     stBuffer.append("if (${destination} != null && ${destination}.getName() != null && !${destination}.getName().isEmpty()) {") 
     .append("return ${destination};") 
     .append('}') 
     .append("return JMapConverter.toDestinationClass2(${destination}, ${source});"); 

     return stBuffer.toString(); 

    } 
} 

public class DestinationClass2 { 
    private DestinationClass1 destinationClass1; 

    //others attributes, getters and setters 

    @JMapConversion(from="sourceClass1", to="destinationClass1", type=Type.DYNAMIC) 
    public static String destinationClass1Conversion(){ 
     StringBuffer stBuffer = new StringBuffer(); 
     stBuffer.append("if (${destination} != null && ${destination}.getId() != null && !${destination}.getId().isEmpty()) {") 
     .append("return ${destination};") 
     .append('}') 
     .append("return JMapConverter.toDestinationClass1(${destination}, ${source});"); 

     return stBuffer.toString(); 

    } 
} 
public class JMapConverter{ 

    public static DestinationClass1 toDestinationClass1(DestinationClass1 destinationClass1, SourceClass1 sourceClass1){ 

     JMapper<DestinationClass1, SourceClass1> mapper = 
       new JMapper<DestinationClass1, SourceClass1>(DestinationClass1.class, SourceClass1.class, ChooseConfig.DESTINATION); 

     if (destinationClass1 == null){ 
      destinationClass1 = mapper.getDestination(sourceClass1); //always passing here 
     } else { 
      mapper.getDestination(destinationClass1, sourceClass1); 
     } 
     return destinationClass1; 
    } 

    public static DestinationClass2 toDestinationClass2(DestinationClass2 destinationClass2, SourceClass2 sourceClass2){ 

     JMapper<DestinationClass2, SourceClass2> mapper = 
       new JMapper<DestinationClass2, SourceClass2>(DestinationClass2.class, SourceClass2.class, ChooseConfig.DESTINATION); 

     if (destinationClass2 == null){ 
      destinationClass2 = mapper.getDestination(sourceClass2); 
     } else { 
      mapper.getDestination(destinationClass2, sourceClass2); 
     } 
     return destinationClass2; 
    } 
} 

结果是：java.lang.StackOverflowError的

Answer 1

使用的源属性的显式转换：

@JMapConversion(from={"sourceClass2"}, to={"fieldNameInDestinationClass"}) 
public FieldInDestClassType conversion(SourceClass2 sourceClass2){ 
    // do the conversion; 
} 

否则框架在试图找出Source对象中有多少属性时会崩溃。

Answer 2

有没有办法用JMapper来控制递归，你必须明确地实现一个块。 DYNAMIC当你需要在同一模式下处理不同的字段时，转换是有用的，在你的情况下STATIC转换就足够了。