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Public API for the Apache MyFaces Trinidad project
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.myfaces.trinidad.event;

import org.apache.myfaces.trinidad.context.Window;
import org.apache.myfaces.trinidad.context.Window.LifecycleState;

/**
 * Event delivered when the LifecycleState of a Window changes.  The cause
 * indicates the cause ot the state change.  The state diagram for theWindow LifecycleStates
 * is
                       +-----------load---------------+
                      |                              |       ---expire---
                      V      /---unload----\         |      /            \
  ---open--->OPEN-----               ----->UNLOADED--              -->CLOSED
                      |      \--navigate---/         ^      \            /
                      |                              |       ---close----
                      +---------closing--------------+

 
 * The new LifecycleStates can be retrieved by calling getLifecycleState on the
 * source Window or by calling the getNewLifecycleState convenience function
 * on the WindowLifecycleEvent
 * @see org.apache.myfaces.trinidad.context.Window
 * @see org.apache.myfaces.trinidad.context.Window.LifecycleState
 */
public class WindowLifecycleEvent extends WindowEvent
{
  /**
   * What caused the delivery of the WindowLifecycleEvent.
   */
  public enum Cause
  {
    /**
     * Delivered when a new Window is open
     */
    OPEN,
    /**
     * Delivered when the content of a Window have been unloaded but cause of the unloading
     * isn't known.
     */
    UNLOAD,
    /**
     * Delivered when the content of a Window have been unloaded as a result of
     * navigating within the application
     */
    NAVIGATE,
    /**
     * Delivered when the content of a Window have been unloaded in order to
     * close the window
     */
    CLOSING,
    
    /**
     * The contents of an existing Window are being reloaded
     */
    RELOAD,
    
    /**
     * The Window is believed to have been closed by the user
     */
    EXPIRE,

    /**
     * The Window is believed to have been closed by the user
     */
    CLOSE
  }

  /**
   * Creates a WindowOpenEvent event for the specified Window and cause.
   */
  public WindowLifecycleEvent(Window source, Cause cause)
  {
    super(source);
    
    if (cause == null)
      throw new NullPointerException();
    
    _cause = cause;
  }
 
  /**
   * @return the cause of the WindowOpen event.
   */
  public Cause getCause()
  {
    return _cause;
  }
  
  /**
   * Returns the new LifecycleState that the Window has moved to.
   */
  public final LifecycleState getNewLifecycleState()
  {
    return getSource().getLifecycleState();
  }

  @Override  
  public int hashCode()
  {
    return getSource().hashCode() * 37 + _cause.hashCode();
  }
  
  @Override
  public boolean equals(Object o)
  {
    if (this == o)
      return true;
    else if ((o != null) && (o.getClass() == WindowLifecycleEvent.class))
    {
      return subclassEquals((WindowLifecycleEvent)o);
    }
    else
    {
      return false;
    }
  }
  
  @Override
  public String toString()
  {
    return super.toString() + ",cause=" + _cause;
  }
  
  /**
   * Called by subclass equals implementation to check the WindowEvent
   * portion of equivalence.
   * @param e Non-null WindowEvent to compare for equality
   * @return true if the the WindowEvent satisfies the WindowEvent portion
   * of equivalence.
   */
  protected final boolean subclassEquals(WindowLifecycleEvent e)
  {
    return super.subclassEquals(e) && _cause.equals(e._cause);
  }

  private final Cause _cause;
  
  private static final long serialVersionUID = 1L;
}