//
//  ========================================================================
//  Copyright (c) 1995-2018 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();
        }
        
        
        
}
