/**
 * $Id: UsingJAXPTest3.java,v 1.1 2003/02/02 03:18:32 bhakti Exp $
 * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
 *
 * This software is the confidential and proprietary information of Sun
 * Microsystems, Inc. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Sun.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
 * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 */

package test.jaxb;

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

import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXParseException;
import org.xml.sax.SAXException;
import org.xml.sax.InputSource;

import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Attr;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import org.w3c.dom.Text;

import java.io.IOException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.dom.DOMSource;


/** 
  * This shows how to parse an xml document using DOM
  * update some node information
  * and transform it
  * using identity transform to an xml file
  */

public class UsingJAXPTest3 {

    public static void main (String args[]) {

	try {
            DocumentBuilderFactory documentBuilderFactory =
                DocumentBuilderFactory.newInstance();
            documentBuilderFactory.setValidating(true);
            documentBuilderFactory.setNamespaceAware(true);
            documentBuilderFactory.setAttribute(
             "http://java.sun.com/xml/jaxp/properties/schemaLanguage",
             "http://www.w3.org/2001/XMLSchema");

            documentBuilderFactory.setAttribute(
             "http://java.sun.com/xml/jaxp/properties/schemaSource",
              new InputSource (new FileInputStream("books.xsd")));
            
            DocumentBuilder documentBuilder =
                   documentBuilderFactory.newDocumentBuilder();
            documentBuilder.setErrorHandler(new MyErrorHandler());

            Document document = documentBuilder.parse(new File("books.xml"));
            NodeList isbnList = document.getElementsByTagName("ISBN");
            Node bookNode = null;
         
            for (int i = 0; i < isbnList.getLength();i++ ) {
                Element isbn = (Element)isbnList.item(i);
                NodeList isbnChildren = isbn.getChildNodes();

                for (int j = 0; j < isbnChildren.getLength();j++ ) {
                    if (isbnChildren.item(j).getNodeValue().trim().
                       equals("522965")){
                        System.out.println("Found book ISBN " +
                         isbnChildren.item(j).getNodeValue() );
                        bookNode = isbnList.item(i).getParentNode();
                        break;
                    }
                }
            }

            NodeList bookChildren = bookNode.getChildNodes();

            for (int k = 0; k < bookChildren.getLength();k++ ) {
                if (bookChildren.item(k).getNodeName().trim().
                       equals("promotion")){

                   Node promotionNode= bookChildren.item(k);
                   NodeList promotionChildren = promotionNode.getChildNodes();

                   for (int l = 0; l < promotionChildren.getLength();l++ ) {
                       if (promotionChildren.item(l).getNodeName().trim().
                           equals("Discount")){
                           Text discount = (Text) promotionChildren.item(l).
                                       getChildNodes().item(0);

                           System.out.println("\nInitial discount offer:" +
                              discount.getNodeValue().trim());

                           discount.setNodeValue
                            ("Spring Sale!! get 30% off entire purchase");

                           System.out.println("Updated discount offer: " +
                              discount.getNodeValue().trim());
                       }
                   }
                }
                 
            }

            DOMSource domSource = new DOMSource(document);
            StreamResult streamResult =new StreamResult(
                new FileOutputStream( "jaxpOutput3.xml"));
            TransformerFactory tFactory = TransformerFactory.newInstance();

            Transformer transformer = tFactory.newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT , "yes");
            transformer.transform(domSource,streamResult);

           System.out.println("\nThe xml document is modified using JAXP "); 
           System.out.println("see jaxpOutput3.xml for details "); 

	} catch( Exception e) {
	    e.printStackTrace();
	    System.exit(0);
	}

    }
}