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///////////////////////////////////////////////////////////////////////////////
//                                                                             
// JTOpen (IBM Toolbox for Java - OSS version)                              
//                                                                             
// Filename: ActionCompletedEventSupport.java
//                                                                             
// The source code contained herein is licensed under the IBM Public License   
// Version 1.0, which has been approved by the Open Source Initiative.         
// Copyright (C) 1997-2000 International Business Machines Corporation and     
// others. All rights reserved.                                                
//                                                                             
///////////////////////////////////////////////////////////////////////////////

package com.ibm.as400.vaccess;

import com.ibm.as400.access.ActionCompletedEvent;
import com.ibm.as400.access.ActionCompletedListener;
import java.util.Enumeration;
import java.util.Vector;



/**
The ActionCompletedEventSupport class represents a list of
ActionCompletedListeners.  It manages the list as well as
provides notification services for ActionCompletedEvents.
**/
class ActionCompletedEventSupport
implements ActionCompletedListener
{
  private static final String copyright = "Copyright (C) 1997-2000 International Business Machines Corporation and others.";


// Source of the events.
private Object  source_ = null;

// Vector of listeners, used to add and remove listeners.
transient private Vector actionListenersV_
    = new Vector();
// Array used to send the events.  Is a copy of actionListenersV_,
// used for speed.
transient private ActionCompletedListener[] actionListeners_
    = new ActionCompletedListener[0];



/**
Constructs a ActionCompletedEventSupport object.

@param  source      The source of the events.
**/
public ActionCompletedEventSupport (Object source)
{
    source_ = source;
}



/**
Processes an action completed event.

@param event The event.
**/
public void actionCompleted (ActionCompletedEvent event)
{
    fireActionCompleted ();
}



/**
Adds a listener.

@param  listener    The listener.
**/
  public void addActionCompletedListener(ActionCompletedListener listener) {
    if (listener == null) {
      throw new NullPointerException("listener");
    }

    synchronized (this) {
      // Add new listener.
      actionListenersV_.addElement(listener);
      actionListeners_ = new ActionCompletedListener[actionListenersV_.size()];
      actionListenersV_.copyInto(actionListeners_);
    }
  }

/**
Fires an ActionCompletedEvent to listeners.
**/
void fireActionCompleted()
{
    ActionCompletedEvent event = new ActionCompletedEvent(source_);
    synchronized(actionListeners_)
    {
        for (int i=0; i