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 * Licensed to the Apache Software Foundation (ASF) under one
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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache 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.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
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package org.openoffice.xmerge.converter.xml.xslt;

import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import org.w3c.dom.*;

import java.io.IOException;
import java.io.ByteArrayOutputStream;
import java.io.ByteArrayInputStream;

import org.openoffice.xmerge.Document;
import org.openoffice.xmerge.ConvertData;
import org.openoffice.xmerge.ConvertException;
import org.openoffice.xmerge.DocumentSerializer;
import org.openoffice.xmerge.converter.xml.xslt.GenericOfficeDocument;
import org.openoffice.xmerge.converter.dom.DOMDocument;
import org.openoffice.xmerge.util.registry.ConverterInfo;
import org.openoffice.xmerge.converter.xml.OfficeConstants;

// Imported TraX classes
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.stream.StreamSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.Source;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

// Imported java classes
import java.io.FileNotFoundException;

/**
 *  <p>Xslt implementation of
 *  org.openoffice.xmerge.DocumentSerializer
 *  for the {@link
 *  org.openoffice.xmerge.converter.xml.xslt.PluginFactoryImpl
 *  PluginFactoryImpl}.</p>
 *
 *  <p>The <code>serialize</code> method transforms the DOM
 *  document from the given <code>Document</code> object by 
 *  means of a supplied Xsl Stylesheet.</p>
 *
 *  @author      Aidan Butler
 */


public final class DocumentSerializerImpl
    implements DocumentSerializer,OfficeConstants,URIResolver {


    /** SXW <code>Document</code> object that this converter processes. */
    private GenericOfficeDocument sxwDoc = null;
 
    private PluginFactoryImpl pluginFactory = null;

    /**
     *  Constructor.
     *  
     *  @param  pf   A <code>PluginFactoryImpl</code>
     *  @param  doc  A SXW <code>Document</code> to be converted.
     */
    public DocumentSerializerImpl(PluginFactoryImpl pf,Document doc) {
	pluginFactory=pf;
        sxwDoc = (GenericOfficeDocument) doc;
    }


    /**
     *  Method to convert a <code>Document</code> with an xsl stylesheet.
     *  It creates a <code>Document</code> object, which is then transformed 
     *  with the Xslt processor. A <code>ConvertData </code> object is 
     *  constructed and returned.
     *
     *  @return cd     A <code>ConvertData</code> object.
     *  @throws  ConvertException  If any I/O error occurs.
     *  @throws  IOException       If any I/O error occurs.
     */
    public ConvertData serialize() throws ConvertException, IOException {
	String docName = sxwDoc.getName();
	org.w3c.dom.Document domDoc = sxwDoc.getContentDOM();
	org.w3c.dom.Document metaDoc = sxwDoc.getMetaDOM();
	org.w3c.dom.Document styleDoc = sxwDoc.getStyleDOM();
	ByteArrayOutputStream baos= new ByteArrayOutputStream();
       	ConvertData cd = new ConvertData();
	Node offnode = (Node)domDoc.getDocumentElement();
	if (!(offnode.getNodeName()).equals("office:document")){
	    try{
	    DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
	    DocumentBuilder builder= builderFactory.newDocumentBuilder();
	    DOMImplementation domImpl = builder.getDOMImplementation();
	    DocumentType docType =domImpl.createDocumentType("office:document","-//OpenOffice.org//DTD OfficeDocument 1.0//EN",null);
	    org.w3c.dom.Document newDoc = domImpl.createDocument("http://openoffice.org/2000/office","office:document",docType);

	    
	    Element rootElement=newDoc.getDocumentElement();
	    rootElement.setAttribute("xmlns:office","http://openoffice.org/2000/office"); 
	    rootElement.setAttribute("xmlns:style","http://openoffice.org/2000/style" ); 
	    rootElement.setAttribute("xmlns:text","http://openoffice.org/2000/text"); 
	     rootElement.setAttribute("xmlns:table","http://openoffice.org/2000/table"); 

	    rootElement.setAttribute("xmlns:draw","http://openoffice.org/2000/drawing"); 
	    rootElement.setAttribute("xmlns:fo","http://www.w3.org/1999/XSL/Format" ); 
	    rootElement.setAttribute("xmlns:xlink","http://www.w3.org/1999/xlink" ); 
	    rootElement.setAttribute("xmlns:dc","http://purl.org/dc/elements/1.1/" ); 
	    rootElement.setAttribute("xmlns:meta","http://openoffice.org/2000/meta" ); 
	    rootElement.setAttribute("xmlns:number","http://openoffice.org/2000/datastyle" ); 
	    rootElement.setAttribute("xmlns:svg","http://www.w3.org/2000/svg" ); 
	    rootElement.setAttribute("xmlns:chart","http://openoffice.org/2000/chart" ); 
	    rootElement.setAttribute("xmlns:dr3d","http://openoffice.org/2000/dr3d" ); 
	    rootElement.setAttribute("xmlns:math","http://www.w3.org/1998/Math/MathML" ); 
	    rootElement.setAttribute("xmlns:form","http://openoffice.org/2000/form" ); 
	    rootElement.setAttribute("xmlns:script","http://openoffice.org/2000/script" ); 
	    rootElement.setAttribute("xmlns:config","http://openoffice.org/2001/config" ); 
	    rootElement.setAttribute("office:class","text" ); 
	    rootElement.setAttribute("office:version","1.0"); 
 

	    NodeList nodeList;
	    Node tmpNode;
	    Node rootNode = (Node)rootElement;
	    if (metaDoc !=null){
		nodeList= metaDoc.getElementsByTagName(TAG_OFFICE_META);
		if (nodeList.getLength()>0){
		    tmpNode = newDoc.importNode(nodeList.item(0),true);
		    rootNode.appendChild(tmpNode);
		}
	    } if (styleDoc !=null){
		nodeList= styleDoc.getElementsByTagName(TAG_OFFICE_STYLES);
		if (nodeList.getLength()>0){
		    tmpNode = newDoc.importNode(nodeList.item(0),true);
		    rootNode.appendChild(tmpNode);
		}
	    }if (domDoc !=null){
		nodeList= domDoc.getElementsByTagName(TAG_OFFICE_AUTOMATIC_STYLES);
		if (nodeList.getLength()>0){
		    tmpNode = newDoc.importNode(nodeList.item(0),true);
		    rootNode.appendChild(tmpNode);
		}
		nodeList= domDoc.getElementsByTagName(TAG_OFFICE_BODY);	
		if (nodeList.getLength()>0){
		    tmpNode = newDoc.importNode(nodeList.item(0),true);
		    rootNode.appendChild(tmpNode);
		}
	    }
	    domDoc=newDoc;
	    }catch(Exception e){
		System.out.println("\nAn Exception occurred with Xslt Serializer"+e);
	    }
	   
	}
	
	try{
	     baos=transform(domDoc);
	}
	catch (Exception e){
		System.out.println("\n Error with Xslt\n");
	}
	
	String ext = pluginFactory.getDeviceFileExtension();	
        DOMDocument resultDomDoc=(DOMDocument)pluginFactory.createDeviceDocument(docName,new ByteArrayInputStream(baos.toByteArray()));
	cd.addDocument (resultDomDoc);
	return cd;
    }

    public Source resolve(String href,String base)
	throws TransformerException{
	    //System.out.println("\nhref "+href+"\nbase "+base);
	    if (href !=null){
		if(href.equals("javax.xml.transform.dom.DOMSource")|| href.equals(""))
		    return null;
		try{
		    ConverterInfo ci = pluginFactory.getConverterInfo();
		    String newhRef ="jar:"+ci.getJarName()+"!/"+href;
		    //System.out.println("\n Looking For "+ newhRef);
		    StreamSource sheetFile= new StreamSource(newhRef);
		    return sheetFile;
		}
		catch (Exception e){
		    System.out.println("\nException in Xslt Resolver " +e);
		    return null;
		}
	    }
	    else 
		return null;
    }


    /*
     * This method performs the sxl transformation on the supplied <code>
     * Document</code> and returns a <code>DOMResult</code> object. 
     *
     *  Xslt transformation code
     *
     * @return baos A <code>ByteArrayOutputStream</code> object containing 
     *               the result of the Xslt transformation.
     * @throws TransformerException,TransformerConfigurationException
     *		  , FileNotFoundException,IOException
     *
     */


    private ByteArrayOutputStream transform(org.w3c.dom.Document domDoc) 
	   throws TransformerException,TransformerConfigurationException
		  , FileNotFoundException,IOException{
	   //System.out.println("\nTransforming...");
	   ConverterInfo ci = pluginFactory.getConverterInfo();
	   //DOMResult xmlDomResult = new DOMResult();
	   ByteArrayOutputStream baos= new ByteArrayOutputStream();
	   try{
	          
		  DocumentBuilderFactory dFactory = DocumentBuilderFactory.newInstance();
		  dFactory.setNamespaceAware(true);
	   
		  DocumentBuilder dBuilder = dFactory.newDocumentBuilder();
		  String teststr = ci.getXsltSerial();
		  
		  teststr= teststr.substring(0,6);
		  org.w3c.dom.Document xslDoc=null;
	          if ((teststr.equals("http:/"))||(teststr.equals("file:/"))
		                                ||(teststr.equals("jar://"))){
		      System.out.println(ci.getXsltSerial());
		      xslDoc= dBuilder.parse(ci.getXsltSerial());

		  }
		  else{      
		      //System.out.println(ci.getJarName()+"!/"+ci.getXsltSerial());
		      xslDoc = dBuilder.parse(
			      "jar:"+ci.getJarName()+"!/"+ci.getXsltSerial());
		  }
		 
		  DOMSource xslDomSource = new DOMSource(xslDoc);     	
		  DOMSource xmlDomSource = new DOMSource(domDoc);		
	
		  //call the tranformer using the XSL, Source and Result.
		  TransformerFactory tFactory = TransformerFactory.newInstance();	
		  tFactory.setURIResolver(this);
		  Transformer transformer = tFactory.newTransformer(xslDomSource);

		  transformer.transform(xmlDomSource, new StreamResult(baos));
		  
			/*  
		  transformer.transform(xmlDomSource, xmlDomResult); //Removed this impl because the DocType was not being written out

		 // Serialize for output to standard out
		  Serializer serializer = SerializerFactory.getSerializer
                                   (OutputProperties.getDefaultMethodProperties("xml"));
	       	  //serializer.setOutputStream(System.out);
		  serializer.setOutputStream(baos);
		  serializer.asDOMSerializer().serialize(xmlDomResult.getNode());
		  //serializer.asDOMSerializer().serialize(xmlDomSource.getNode());
		  
	      
		  //System.out.println("\n** Transform Complete ***");
		  */
	   }
	   catch(Exception e){
	          System.out.println("An error occurred in the transformation : "+e);
	   }
	   return baos;
     }


}