/** 

 * ReadXML.java
 * 
 * Based on the Apache's Xerces sample "DOMCount.java" and IBM's domOne.java (www.ibm.com/developerWorks).
 * You can download the Xerces XML parser at 
 * http://xml.apache.org/dist/xerces-j/.
 *
 * In order to compile this sample, xerces.jar must be in your CLASSPATH.
 *
 * JPM, December 2000
**/


import java.io.OutputStreamWriter;

import java.io.PrintWriter;


import org.apache.xerces.dom.TextImpl;

import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**

 *  class ReadXML

 *
 *  Illustrates how to go through a DOM tree.

 *

 * @author     Jean-Philippe Martin 

 * @created    December 2000 

 */

public class ReadXML {

    private static boolean setValidation    = false; //defaults
    private static boolean setNameSpaces    = true;
    private static boolean setDeferredDOM   = true;


  /**

   *  Main entry point 

   *

   * @param  uri  file (or URL) to be parsed 

   */

  public static void parseAndPrint(String uri) {


        try {
            org.apache.xerces.parsers.DOMParser parser = new org.apache.xerces.parsers.DOMParser();
            ReadXML reader = new ReadXML();
            long before = System.currentTimeMillis();
            parser.setFeature( "http://apache.org/xml/features/dom/defer-node-expansion",

                               setDeferredDOM );
            parser.setFeature( "http://xml.org/sax/features/validation", 
                               setValidation );
            parser.setFeature( "http://xml.org/sax/features/namespaces",
                               setNameSpaces );

            parser.parse(uri);
            reader.printDOMTree(parser.getDocument());
            long after = System.currentTimeMillis();
            System.out.println("\n\nDone. Processing took "+(after - before)+"ms.");
        } catch (Exception e) {
            e.printStackTrace(System.err);
        }
  
  }





  /**

   *  Prints the specified node, then prints all of its children. 

   *

   * @param  node  the Node to print 

   */

  public void printDOMTree(Node node) {

    int type = node.getNodeType();

    switch (type) {

// print the document element

      case Node.DOCUMENT_NODE:

      {

        System.out.println("<?xml version=\"1.0\" ?>");

        printDOMTree(((Document) node).getDocumentElement());

        break;

      }

// print element with attributes

      case Node.ELEMENT_NODE:

      {

        System.out.print("<");

        System.out.print(node.getNodeName());

        NamedNodeMap attrs = node.getAttributes();

        for (int i = 0; i < attrs.getLength(); i++) {

          Node attr = attrs.item(i);

          System.out.print("" + attr.getNodeName() + 

              "=\"" + attr.getNodeValue() + 

              "\"");

        }

        System.out.println(">");

        NodeList children = node.getChildNodes();

        if (children != null) {

          int len = children.getLength();

          for (int i = 0; i < len; i++) {

            printDOMTree(children.item(i));

          }

        }

        break;

      }

// handle entity reference nodes

      case Node.ENTITY_REFERENCE_NODE:

      {

        System.out.print("&");

        System.out.print(node.getNodeName());

        System.out.print(";");

        break;

      }

// print cdata sections

      case Node.CDATA_SECTION_NODE:

      {

        System.out.print("<![CDATA[");

        System.out.print(node.getNodeValue());

        System.out.print("]]>");

        break;

      }

// print text.
      case Node.TEXT_NODE:

      {

        System.out.print(node.getNodeValue());

        break;

      }

// print processing instruction

      case Node.PROCESSING_INSTRUCTION_NODE:

      {

        System.out.print("<?");

        System.out.print(node.getNodeName());

        String data = node.getNodeValue();

         {

          System.out.print("");

          System.out.print(data);

        }

        System.out.print("?>");

        break;

      }

    }

    if (type == Node.ELEMENT_NODE) {

      System.out.println();

      System.out.print("</");

      System.out.print(node.getNodeName());

      System.out.print('>');

    }

  }



  /**

   *  Main program entry point. 

   *

   * @param  argv  URI of the XML file (or URL) to be parsed 

   */

  public static void main(String argv[]) {

    if (argv.length == 0) {

      System.out.println("Usage: java ReadXML uri");

      System.out.println(" where uri is the URI of the XML document you want to print.");

      System.out.println(" Sample: java ReadXML CDAlbum.xml");

      System.exit(1);

    }

    ReadXML.parseAndPrint(argv[0]);

  }

}