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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
| Copyright © 1999-2005 ExoLab Group, Intalio Inc., and Contributors. All rights reserved. Java, EJB, JDBC, JNDI, JTA, Sun, Sun Microsystems are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and in other countries. XML, XML Schema, XSLT and related standards are trademarks or registered trademarks of MIT, INRIA, Keio or others, and a product of the World Wide Web Consortium. All other product names mentioned herein are trademarks of their respective owners. |