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Date: Tue, 20 Dec 2005 16:43:11 +0100
From: Valerio Schiavoni <valerio.schiavoni@gmail.com>
To: commons-user@jakarta.apache.org
Subject: Using digester: how to create parent node knowing the child nodes...
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Hello,
this is my first post to the commons ml, thanks for the support.

i'm willing to use digester to parse this kind ofxml:

<parameters  type=3D3D"RenameRelationOperator Parameter">
   <param>newName</param>
</parameters>

there could be different kind of type values.

Now, the value of the parameters should be used on the
1-arg constructor for objects of type RenameRelationOperatorParameter. At
this time, there are no setParam method, and i' searching for a solution
that avoid adding them.

in my digesterReader at this time i have this (reduced to show the problem)
:

digester.addFactoryCreate("parameters", new OperatorParameterFactory());

and the OperatorParameterFactory (local to MyDigesterReader) is:

   public static class OperatorParameterFactory extends
AbstractObjectCreationFactory {

     @Override
     public Object createObject(Attributes arg0) throws Exception {
         String operatorType =3D3D arg0.getValue("type");
         OperatorParameter result =3D3D null;

         try {
           result =3D3D (OperatorParameter) Class.forName
(operatorType).newInstance();
         }catch ( ClassNotFoundException e) {
           throw new UnsupportedOperationException("OperatorParameter name=
=3D
d
"+operatorType+" is not supported yet");
         }

         return result;
     }

 }

thanks for any support you can provide,
valerio


--
To Iterate is Human, to Recurse, Divine
James O. Coplien, Bell Labs

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