// ========================================================================
   // Copyright (c) 2010-2011 Mort Bay Consulting Pty. Ltd.
   // ------------------------------------------------------------------------
   // All rights reserved. This program and the accompanying materials
   // are made available under the terms of the Eclipse Public License v1.0
   // and Apache License v2.0 which accompanies this distribution.
   // The Eclipse Public License is available at 
   // http://www.eclipse.org/legal/epl-v10.html
   // The Apache License v2.0 is available at
  // http://www.opensource.org/licenses/apache2.0.php
  // You may elect to redistribute this code under either of these licenses. 
  // ========================================================================
  package org.eclipse.jetty.osgi.httpservice;
  
  import java.io.IOException;
  
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.eclipse.jetty.server.Request;
  import org.eclipse.jetty.servlet.ErrorPageErrorHandler;
  
  /**
   * Extended error page handler.
   * Makes it easy to plug a servlet to handle errors thrown by the HttpService or
   * to use Jetty's ErrorPageErrorHandler API to plug custom error pages.
   */
  public class HttpServiceErrorPageErrorHandler extends ErrorPageErrorHandler
  {
  
  	private static HttpServiceErrorPageErrorHandler INSTANCE;
  	
  	public static HttpServiceErrorPageErrorHandler getInstance()
  	{
  		return INSTANCE;
  	}
  	
  	public HttpServiceErrorPageErrorHandler()
  	{
  		INSTANCE = this;
  	}
  
  	@Override
  	public void handle(String target, Request baseRequest,
  			HttpServletRequest request, HttpServletResponse response)
  			throws IOException {
  		if (HttpServiceErrorHandlerHelper.getCustomErrorHandler() != null)
  		{
  			try
  			{
  				HttpServiceErrorHandlerHelper.getCustomErrorHandler().service(request, response);
  			}
  			catch (ServletException e)
  			{
  				//well
  			}
  		}
  		if (!response.isCommitted())
  		{
  			super.handle(target, baseRequest, request, response);
  		}
  	}
  
  	@Override
  	protected void doStop() throws Exception
  	{
  		INSTANCE = null;
  		super.doStop();
  	}
  	
  	
  	
  }