requesthandler.java

weblogic_src_xml.rar

package examples.xml.sax;

import java.io.*;
import java.net.*;
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;

/**
 * This class extends <tt>HandlerBase</tt> and is used to handle events
 * created as an XML document is parsed by a SAX compliant
 * parser.
 *
 * @author Copyright (c) 2002 by BEA Systems, Inc. All Rights Reserved.
 */

public class RequestHandler extends DefaultHandler {

  /** Default constructor. */
  public RequestHandler() {}


  //==========================================================================
  // DocumentHandler methods
  //==========================================================================

  // Amount to indent
  private String indentString = "    ";
  private int indentLevel = 0;

  /**
   * Receives notification of the beginning of the XML document.
   * Starts printing information to the shell from which you started the
   * WebLogic server.
   *
   * @exception SAXException If an error occurred starting to parse the XML doc
   */
  public void startDocument() throws SAXException {
    nl();
    nl();
    System.out.println("START DOCUMENT");
    nl();
    System.out.println("<?xml version='1.0' encoding='UTF-8'?>");
  }

  /**
   * Receives notification of the end of the XML document.  Prints a
   * final message to the shell from which you started the WebLogic server.
   *
   * @exception SAXException If an error occurred while parsing the XML doc
   */
  public void endDocument() throws SAXException {
    nl();
    System.out.println("END DOCUMENT");
    try {
      nl();
    } catch (Exception e) {
      throw new SAXException ("I/O error", e);
    }

  }

  /**
   * Receives notification of the start of an element.   Prints out the
   * name and value of the element, properly indented, to the shell from
   * which you started the WebLogic server.
   *
   * @param name   the string name of the element
   * @param attrs  the list of attributes of the element
   * @exception    SAXException if an error occurred while parsing the XML doc
   */
  public void startElementstartElement(java.lang.String uri, java.lang.String localName, java.lang.String qName, Attributes attributes) throws SAXException {
    indentLevel++;
    nl();
    System.out.println("ELEMENT: " + qName);
    if (attributes != null) {
      for (int i = 0; i < attributes.getLength (); i++) {
        nl();
        System.out.println("   ATTR: " + attributes.getLocalName(i) + " = " + attributes.getValue(i));
        }
      }
   }

   /**
    * Receives notification of the end of an element.   Prints
    * notice to the shell from which you started the WebLogic server.
    *
    * @param name the string name of the element
    * @exception SAXException If an error occurred while parsing the XML doc
    */
   public void endElement(java.lang.String uri, java.lang.String localName, java.lang.String qName)
     throws SAXException {
     nl();
     System.out.println ("END_ELM: " + qName);
     indentLevel--;
   }

  /**
   * Receives notification of character data inside an element. Prints out
   * characters to the shell from which you started the WebLogic server.
   *
   * @param buf     array of characters
   * @param offset  the start position in the character array
   * @param len     the number of characters to use from the array
   * @exception     SAXException if an error occurred while parsing the XML doc
   */
   public void characters (char buf [], int offset, int len) throws SAXException {
     nl();
     String s = new String(buf, offset, len);
       if (!s.trim().equals("")) System.out.println ("CHARS:   " + s);
   }

   //===========================================================
   // Helpers ...
   //===========================================================

   /**
    * Starts a new line and indents the next line appropriately.
    *
    * @exception SAXException If an error occurred while parsing the XML doc
    */
   private void nl () throws SAXException {
     String lineEnd =  System.getProperty("line.separator");
       try {
         System.out.print(lineEnd);
         for (int i=0; i < indentLevel; i++) System.out.print(indentString);
       } catch (Exception e) {
           throw new SAXException ("I/O error", e);
       }
   }

  //=============================================================
  // ErrorHandler methods
  //=============================================================

   /**
    * Receives notification of a recoverable parser error.
    *
    * @param x   the parser exception that occurred
    * @exception SAXException if an error occurred while receiving the original error
    */
   public void error (SAXParseException x) throws SAXException {
     throw x;
   }

}