/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qmlcleanup_p.h"

#include "qmlengine_p.h"

/*!
\internal
\class QmlCleanup
\brief The QmlCleanup provides a callback when a QmlEngine is deleted. 

Any object that needs cleanup to occur before the QmlEngine's QScriptEngine is
destroyed should inherit from QmlCleanup.  The clear() virtual method will be
called by QmlEngine just before it deletes the QScriptEngine.
*/

/*!
\internal

Create a QmlCleanup for \a engine
*/
QmlCleanup::QmlCleanup(QmlEngine *engine)
: prev(0), next(0)
{
    if (!engine)
        return;

    QmlEnginePrivate *p = QmlEnginePrivate::get(engine);

    if (p->cleanup) next = p->cleanup;
    p->cleanup = this;
    prev = &p->cleanup;
    if (next) next->prev = &next;
}

/*!
\internal
*/
QmlCleanup::~QmlCleanup()
{
    if (prev) *prev = next;
    if (next) next->prev = prev;
    prev = 0; 
    next = 0;
}