// File: xmltest.java
//
// Author: Rahul Simha
// Version: Feb 11, 2000
//
// A simple demonstration of XML parsing.

import com.ibm.xml.parser.*;
import org.w3c.dom.*;
import java.io.*;

public class xmltest {

  // Traverse a subtree whose root is the parameter.

  public static void traverse (Node n)
  {
    // Extract node info:
    String nodename = n.getNodeName();
    String valueStr = n.getNodeValue();
    // Print and continue traversing.
    System.out.println ("Node: " + n.getNodeName() + " value=[" + valueStr + "]");

    // Now traverse the rest of the tree in depth-first order.
    if (n.hasChildNodes()) {
      // Get the children in a list.
      NodeList nl = n.getChildNodes();
      // How many of them?
      int size = nl.getLength();
      for (int i=0; i<size; i++)
        // Recursively traverse each of the children.
	traverse (nl.item(i));
    }
  }

  public static void main (String[] argv)
  {
    // Pick off the XML file name from the command-line arguments.
    if (argv.length > 0) {
      try {
        // Get the XML file name, e.g., "student.xml".
	FileReader fr = new FileReader (argv[0]);

        // Create a parser instance.
	Parser p = new Parser (argv[0]);

        // These two will decide whether the parser will
        // retain whitespace and comments from the original file.
	p.setKeepComment (false);
	p.setPreserveSpace (false);

        // Now parse and create a document tree as a result.
        // Note that we are passing a FileReader wrapped around
        // the file.
	TXDocument doc = p.readStream(fr);

        // Once we have the tree, extract the root.
	Element root = doc.getDocumentElement ();

        // Now traverse the tree.
	System.out.println ("TRAVERSE ...");
	traverse (root);

        // Alternatively, here is a scan by TAG name
        // for the tag "NAME".
	System.out.println ("BY THE TAG 'NAME': ");
	NodeList nl = doc.getElementsByTagName ("NAME");
	int size = nl.getLength();
	for (int i=0; i<size; i++)
	  traverse (nl.item(i));
      }
      catch (IOException e) {
	System.out.println ("Usage: java xmltest <filename>");
      }
    }
    else {
	System.out.println ("Usage: java xmltest <filename>");
    }
  }
}