蓖麻 - 解组空字符串为空

Question

如何在使用Castor时将空字符解组为空值？

Answer 1

public class EmptyStringHandler extends GeneralizedFieldHandler { 
    public Object convertUponGet(Object arg0) { 
     //we don't know if it was really null or not, so just return it 
     return arg0; 
    } 
    public Object convertUponSet(Object arg0) { 
     if("".equals(arg0)) { 
      return null; 
     } 
     return arg0; 
    } 
    public Class getFieldType() { 
     return String.class; 
    } 
} 


<field name="amid" type="integer" required="true" handler="cat.dds.fpsdma.fieldhandlers.EmptyIntegerHandler"> 
<bind-xml name="AMID" node="element" /> 
</field>