/**
 * Copyright (c) 2010, Sebastian Sdorra
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of SCM-Manager; 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 REGENTS 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.
 *
 * http://bitbucket.org/sdorra/scm-manager
 *
 */


package sonia.scm.lifecycle.modules;

//~--- non-JDK imports --------------------------------------------------------

import com.google.inject.Inject;
import com.google.inject.Singleton;

//~--- JDK imports ------------------------------------------------------------

import java.util.Collections;
import java.util.Set;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

/**
 *
 * @author Sebastian Sdorra
 */
@Singleton
public class ServletContextListenerHolder implements ServletContextListener {

  static class ListenerHolder {
    @Inject(optional = true)
    private Set<ServletContextListener> listenerSet;

    private Set<ServletContextListener> getListenerSet() {
      if (listenerSet == null) {
        return Collections.emptySet();
      }
      return listenerSet;
    }
  }

  private final Set<ServletContextListener> listenerSet;

  @Inject
  public ServletContextListenerHolder(ListenerHolder listeners)
  {
    this.listenerSet = listeners.getListenerSet();
  }


  @Override
  public void contextInitialized(ServletContextEvent sce) {
    listenerSet.forEach(listener -> listener.contextInitialized(sce));
  }

  @Override
  public void contextDestroyed(ServletContextEvent sce) {
    listenerSet.forEach(listener -> listener.contextDestroyed(sce));
  }
}
