/*
 * Copyright (c) 2003, KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * - Neither the name of the KNOPFLERFISH project nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.knopflerfish.bundle.http;

import java.util.Dictionary;
import java.util.Hashtable;

import javax.servlet.RequestDispatcher;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;

import org.osgi.service.http.HttpContext;


public class ServletRegistration implements Registration {

  // private fields

  private final ServletContextManager contextManager;
  private final Registrations registrations;
  private final RequestDispatcherImpl dispatcher;


  // constructors

  public ServletRegistration(final String alias,
                             final Servlet servlet,
                             Dictionary parameters,
                             final HttpContext httpContext,
                             final ServletContextManager contextManager,
                             final Registrations registrations)
      throws ServletException {

    if (parameters == null)
      parameters = new Hashtable();

    if (parameters.get(HttpUtil.SERVLET_NAME_KEY) == null)
      parameters.put(HttpUtil.SERVLET_NAME_KEY,
                     servlet.getClass().getName());

    this.contextManager = contextManager;
    this.registrations = registrations;

    final ServletContext context =
        contextManager.getServletContext(httpContext, null);
    final ServletConfig config = new ServletConfigImpl(parameters, context);
    servlet.init(config);

    dispatcher = new RequestDispatcherImpl(alias, servlet, httpContext);

    registrations.addServlet(servlet);
  }


  // implements Registration

  public RequestDispatcherImpl getRequestDispatcher(final String uri) {

    dispatcher.setURI(uri);

    return dispatcher;
  }

  public void destroy() {

    final Servlet servlet = dispatcher.getServlet();
    final ServletContext context =
        servlet.getServletConfig().getServletContext();
    servlet.destroy();
    contextManager.ungetServletContext(context);

    registrations.removeServlet(servlet);
  }

} // ServletRegistration