ContentHandler Class

import org.xml.sax.*;
import org.apache.xerces.parsers.*;
import java.net.*;
import java.util.*;
import java.io.*;

             // conflicts with java.net.ContentHandler
class URIGrabber implements org.xml.sax.ContentHandler {
    
  private Vector urls;
     
  URIGrabber(Vector urls) {
    this.urls = urls;
  }
    
  // do nothing methods  
  public void setDocumentLocator(Locator locator) {}
  public void startDocument() throws SAXException {}
  public void endDocument() throws SAXException {}
  public void startPrefixMapping(String prefix, String uri) 
   throws SAXException {}
  public void endPrefixMapping(String prefix) throws SAXException {}
  public void skippedEntity(String name) throws SAXException {}  
  public void ignorableWhitespace(char[] text, int start, int length)
   throws SAXException {}
  public void processingInstruction(String target, String data)
   throws SAXException {}
  
  
  // Remember, there's no guarantee all the text of the
  // url element will be returned in a single call to characters
  private StringBuffer urlBuffer;
  private boolean collecting = false;
  
  public void startElement(String namespaceURI, String localName,
	 String rawName, Attributes atts) throws SAXException {
	  
    if (rawName.equals("url")) {
      collecting = true;
      urlBuffer = new StringBuffer();
    } 
    
  }
  
  public void characters(char[] text, int start, int length) 
   throws SAXException {
    
    if (collecting) {
      urlBuffer.append(text, start, length);
    } 
    
  }
  
  public void endElement(String namespaceURI, String localName,
	 String rawName) throws SAXException {
	  
    if (rawName.equals("url")) {
      collecting = false;
      String url = urlBuffer.toString();
      try {
        urls.addElement(new URL(url));
      }
      catch (MalformedURLException e) {
        // skip this url
      }
    }
    
  } 
    
}