Forward.java example

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resin-master
/*
 * 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 javax.servlet.DispatcherType;
import javax.servlet.FilterChain;

import com.caucho.config.ConfigException;
import com.caucho.config.Configurable;
import com.caucho.server.dispatch.ForwardAbsoluteFilterChain;
import com.caucho.server.dispatch.ForwardFilterChain;
import com.caucho.server.webapp.WebApp;
import com.caucho.util.L10N;

/**
 * Forwards a requests using the servlet RequestDispatcher.forward call
 * protocol.
 *
 * <pre>
 * <web-app xmlns:resin="urn:java:com.caucho.resin">
 *
 *   <resin:Forward regexp="^/foo" target="/bar"/>
 *
 * </web-app>
 * </pre>
 */
@Configurable
public class Forward extends AbstractRegexpDispatchRule
{
  private static final L10N L = new L10N(Forward.class);

  private String _target;

  private boolean _isAbsolute;

  @Configurable
  public void setTarget(String target)
  {
    _target = target;
  }

  @Configurable
  public void setAbsoluteTarget(String target)
  {
    setTarget(target);

    _isAbsolute = true;
  }

  @Configurable
  public void setTargetHost(String target)
  {
  }

  @Override
  protected String rewriteTarget(Matcher matcher,
                                 String uri,
                                 String queryString)
  {
    // server/1kna
    queryString = null;
    
    if (_target != null)
      uri = matcher.replaceAll(_target);

    return super.rewriteTarget(matcher, uri, queryString);
  }

  //  @Override
  public void init()
    throws ConfigException
  {
    // super.init();

    if (_target == null) {
      throw new ConfigException(L.l("'target' is a required attribute of '{0}' because Resin needs to know the destination URL.",
                                    getClass().getSimpleName()));
    }

    /*
    if (getRegexp() == null && getFullUrlRegexp() == null)
      setRegexp(ALL_PATTERN);
    */
  }

  @Override
  public FilterChain createDispatch(DispatcherType type,
                                    String uri,
                                    String queryString,
                                    String target,
                                    FilterChain next)
  {
    if (_isAbsolute)
      return new ForwardAbsoluteFilterChain(target, WebApp.getCurrent());
    else
      return new ForwardFilterChain(target);
  }
}