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How to map an innner class


Intended Audience
Prerequisites
Basic concept
Mapping file
Unmarshalling
References


Intended Audience

Anyone who wants to map an inner class with Castor XML for XML data binding.

This document helps people to get familiar with the basic concepts of mapping and shows an example.

Prerequisites

A general understanding about XML data binding and its usage.

Basic concept

Assume you have the following classes Outer and Inner:

package test;

public class Outer {

   private Inner member;
   
   public Inner getMember() { return member; }
   public void setMember (Inner member) { this.member = member; }
   
   public static class Inner {
   
      private String innerMember;
      
      public String getInnerMember() { return innerMember; }
      public void setInnerMember(String innerMember) { this.innerMember = innerMember; }
      
   }
}

Please note that the i nner class needs to be declared public and static.

Mapping file

Here's the mapping file for Castor XML, showing the class mapping for the OrderItem class:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<mapping>
   <class name="test.Outer">
      <field name="member" type="test.Outer$Inner">
         <bind-xml name="member" node="element" />
      </field>
   </class>
   <class name="test.Outer$Inner">
      <field name="innerMember" type="java.lang.String">
         <bind-xml name="innerMember" node="element" />
      </field>
   </class>
</mapping>

Unmarshalling

Using the Castor XML Unmarshaller with the mapping file shown above, the code to unmarshal the following XML ...

<?xml version="1.0"?>
<outer>
   <member>
      <innerMember>blah</innerMember>
   </member>
</outer>

... into a variable of type test.Outer is as follows:

InputSource mappingSource = ...;
Mapping mapping = new Mapping();
mapping.loadMapping(mappingSource);        

InputSource inputSource = ...;
Unmarshaller unmarshaller = new Unmarshaller(test.Outer.class);
unmarshaller.setMapping(mapping);
test.Outer outer = (test.Outer) unmarshaller.unmarshal(inputSource);

References

-XML mapping
 
   
  
   
 


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