/*
 * Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.rewrite;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;

import com.caucho.config.Configurable;

/*
 * Redirect a request using a HTTP redirect.
 * protocol.
 *
 * <pre>
 * <web-app xmlns:resin="urn:java:com.caucho.resin">
 *
 *   <resin:Redirect regexp="^/foo" target="/bar"/>
 *
 * </web-app>
 * </pre>
 */
@Configurable
public class Rewrite extends AbstractTargetDispatchRule
{
  @Override
  public String rewriteUri(String uri, String queryString)
  {
    Pattern regexp = getRegexp();

    if (regexp == null)
      return uri;

    Matcher matcher = regexp.matcher(uri);

    if (! matcher.find())
      return uri;

    return rewriteTarget(matcher, uri, queryString);
  }
  
  public FilterChain map(String uri,
                         String queryString,
                         FilterChain next,
                         FilterChain tail)
    throws ServletException
  {
    return next;
  }
}