/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.1 (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.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or 
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * ***** END LICENSE BLOCK ***** */
#include "nsDeleteObserver.h"
#include "nsVoidArray.h"


//-------------------------------------------------------------------------
//
//-------------------------------------------------------------------------

nsDeleteObserved::nsDeleteObserved(void* aObject)
{
	mDeleteObserverArray = nsnull;
	mObject = (aObject ? aObject : this);
}

//-------------------------------------------------------------------------
//
//-------------------------------------------------------------------------

nsDeleteObserved::~nsDeleteObserved()
{
	if (mDeleteObserverArray)
	{
		// notify observers of the delete
		for (PRInt32 i = mDeleteObserverArray->Count() - 1; i >= 0; --i)
		{
			nsDeleteObserver* deleteObserver = static_cast<nsDeleteObserver*>(mDeleteObserverArray->ElementAt(i));
			if (deleteObserver)
				deleteObserver->NotifyDelete(mObject);
		}

		delete mDeleteObserverArray;
		mDeleteObserverArray = nsnull;
	}
}

//-------------------------------------------------------------------------
//
//-------------------------------------------------------------------------

PRBool nsDeleteObserved::AddDeleteObserver(nsDeleteObserver* aDeleteObserver)
{
	if (! mDeleteObserverArray)
		mDeleteObserverArray = new nsVoidArray();

	if (mDeleteObserverArray)
		return mDeleteObserverArray->AppendElement(aDeleteObserver);
	return PR_FALSE;
}

//-------------------------------------------------------------------------
//
//-------------------------------------------------------------------------

PRBool nsDeleteObserved::RemoveDeleteObserver(nsDeleteObserver* aDeleteObserver)
{
	if (mDeleteObserverArray)
		return mDeleteObserverArray->RemoveElement(aDeleteObserver);
	return PR_FALSE;
}