12.44. Example Visitor Configuration

This example will use the SAXVisitor implementation as follows: 
@TextConsumer
public class ChangeItemState implements SAXVisitAfter 
{
   @StreamResultWriter
   private SAXToXMLWriter xmlWriter;

   @ConfigParam
   private String newState;

   public void visitAfter(SAXElement element, ExecutionContext executionContext) 
                                             throws SmooksException, IOException 
   {
      element.setAttribute("state", newState);

      xmlWriter.writeStartElement(element);
      xmlWriter.writeText(element);
      xmlWriter.writeEndElement(element);
   }
}
Declaratively configuring ChangeItemState to fire on <order-item> fragments having a status of OK is shown below: 
<smooks-resource-list 
   xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd">
 
   <resource-config selector="order-items/order-item[@status = 'OK']">
      <resource>com.acme.ChangeItemState </resource>
      <param name="newState">COMPLETED</param>
   </resource-config>
 
</smooks-resource-list>
Custom configuration namespaces can be used to define a cleaner and more strongly typed configuration for the ChangeItemState component. A custom configuration namespace component is configured as follows: 
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd" 
   xmlns:order="http://www.acme.com/schemas/smooks/order.xsd">
 
   <order:changeItemState itemElement="order-items/order-item[@status = 'OK']" 
      newState="COMPLETED" />
 
</smooks-resource-list>
This Visitor could also be configured in source code as follows: 
Smooks smooks = new Smooks();

smooks.addVisitor(new ChangeItemState().setNewState("COMPLETED"), 
                                 "order-items/order-item[@status = 'OK']");

smooks.filterSource(new StreamSource(inReader), new StreamResult(outWriter));