source: vbox/trunk/src/libs/xpcom18a4/xpcom/ds/nsArrayEnumerator.h@ 4837

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * 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 XPCOM Array implementation.
 *
 * The Initial Developer of the Original Code
 * Netscape Communications Corp.
 * Portions created by the Initial Developer are Copyright (C) 2002
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Alec Flett <alecf@netscape.com>
 *
 * 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
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef nsArrayEnumerator_h__
#define nsArrayEnumerator_h__

// enumerator implementation for nsIArray

#include "nsIArray.h"
#include "nsCOMArray.h"
#include "nsISimpleEnumerator.h"
#include "nsCOMPtr.h"

class nsSimpleArrayEnumerator : public nsISimpleEnumerator
{
public:
    // nsISupports interface
    NS_DECL_ISUPPORTS

    // nsISimpleEnumerator interface
    NS_DECL_NSISIMPLEENUMERATOR

    // nsSimpleArrayEnumerator methods
    nsSimpleArrayEnumerator(nsIArray* aValueArray) :
        mValueArray(aValueArray), mIndex(0) {
    }

private:
    ~nsSimpleArrayEnumerator() {}

protected:
    nsCOMPtr<nsIArray> mValueArray;
    PRUint32 mIndex;
};


// Create an enumerator for an existing nsIArray implementation
// The enumerator holds an owning reference to the array.
extern NS_COM nsresult
NS_NewArrayEnumerator(nsISimpleEnumerator* *result,
                      nsIArray* array);


// create an enumerator for an existing nsCOMArray<T> implementation
// The enumerator will hold an owning reference to each ELEMENT in
// the array. This means that the nsCOMArray<T> can safely go away
// without its objects going away.
extern NS_COM nsresult
NS_NewArrayEnumerator(nsISimpleEnumerator* *aResult,
                      const nsCOMArray_base& aArray);

#endif