/**
    * Copyright 2005-2011 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.opensource.org/licenses/ecl2.php
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.kuali.rice.kew.transformation;
  
  import java.io.IOException;
  
  import javax.xml.transform.TransformerConfigurationException;
  import javax.xml.transform.TransformerException;
  import javax.xml.transform.TransformerFactory;
  import javax.xml.transform.sax.SAXResult;
  import javax.xml.transform.sax.SAXSource;
  import javax.xml.transform.sax.SAXTransformerFactory;
  import javax.xml.transform.sax.TransformerHandler;
  import javax.xml.transform.stream.StreamSource;
  
  import org.apache.xml.serializer.OutputPropertiesFactory;
  import org.apache.xml.serializer.Serializer;
  import org.apache.xml.serializer.SerializerFactory;
  import org.junit.Test;
  import org.kuali.rice.kew.test.KEWTestCase;
  import org.xml.sax.InputSource;
  import org.xml.sax.SAXException;
  import org.xml.sax.XMLReader;
  import org.xml.sax.helpers.XMLReaderFactory;
  
    /**
     * This example shows how to chain a series of transformations by
     * piping SAX events from one Transformer to another. Each Transformer
     * operates as a SAX2 XMLFilter/XMLReader.
     */
  public class Pipe extends KEWTestCase
  {
  	@Test
  	public void testPipe()
  	throws TransformerException, TransformerConfigurationException, 
           SAXException, IOException	   
  	{
      // Instantiate  a TransformerFactory.
    	TransformerFactory tFactory = TransformerFactory.newInstance();
      // Determine whether the TransformerFactory supports The use uf SAXSource 
      // and SAXResult
      if (tFactory.getFeature(SAXSource.FEATURE) && tFactory.getFeature(SAXResult.FEATURE))
      { 
        // Cast the TransformerFactory to SAXTransformerFactory.
        SAXTransformerFactory saxTFactory = ((SAXTransformerFactory) tFactory);	  
        // Create a TransformerHandler for each stylesheet.
        TransformerHandler tHandler1 = saxTFactory.newTransformerHandler(new StreamSource(Pipe.class.getResourceAsStream("foo1.xsl")));
        TransformerHandler tHandler2 = saxTFactory.newTransformerHandler(new StreamSource(Pipe.class.getResourceAsStream("foo2.xsl")));
        TransformerHandler tHandler3 = saxTFactory.newTransformerHandler(new StreamSource(Pipe.class.getResourceAsStream("foo3.xsl")));
      
        // Create an XMLReader.
  	    XMLReader reader = XMLReaderFactory.createXMLReader();
        reader.setContentHandler(tHandler1);
        reader.setProperty("http://xml.org/sax/properties/lexical-handler", tHandler1);
  
        tHandler1.setResult(new SAXResult(tHandler2));
        tHandler2.setResult(new SAXResult(tHandler3));
  
        // transformer3 outputs SAX events to the serializer.
        java.util.Properties xmlProps = OutputPropertiesFactory.getDefaultMethodProperties("xml");
        xmlProps.setProperty("indent", "yes");
        xmlProps.setProperty("standalone", "no");
        Serializer serializer = SerializerFactory.getSerializer(xmlProps);
        serializer.setOutputStream(System.out);
        tHandler3.setResult(new SAXResult(serializer.asContentHandler()));
  
  	    // Parse the XML input document. The input ContentHandler and output ContentHandler
        // work in separate threads to optimize performance.   
        reader.parse(new InputSource(Pipe.class.getResourceAsStream("foo.xml")));
      }
    }
  }