/**
 * Copyright 2005-2013 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")));
    }
  }
}
