/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qplatformprintplugin.h"
#include "qplatformprintersupport.h"
#include "qprinterinfo.h"
#include "private/qfactoryloader_p.h"
#include <qcoreapplication.h>

QT_BEGIN_NAMESPACE

#ifndef QT_NO_LIBRARY
Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader,
    (QPlatformPrinterSupportFactoryInterface_iid, QLatin1String("/printsupport"), Qt::CaseInsensitive))
#endif

QPlatformPrinterSupportPlugin::QPlatformPrinterSupportPlugin(QObject *parent)
    : QObject(parent)
{
}

QPlatformPrinterSupportPlugin::~QPlatformPrinterSupportPlugin()
{
}

static QPlatformPrinterSupport *printerSupport = 0;

static void cleanupPrinterSupport()
{
#ifndef QT_NO_PRINTER
    delete printerSupport;
#endif
    printerSupport = 0;
}

/*!
    \internal

    Returns a lazily-initialized singleton. Ownership is granted to the
    QPlatformPrinterSupportPlugin, which is never unloaded or destroyed until
    application exit, i.e. you can expect this pointer to always be valid and
    multiple calls to this function will always return the same pointer.
*/
QPlatformPrinterSupport *QPlatformPrinterSupportPlugin::get()
{
    if (!printerSupport) {
        const QMultiMap<int, QString> keyMap = loader()->keyMap();
        if (!keyMap.isEmpty())
            printerSupport = qLoadPlugin<QPlatformPrinterSupport, QPlatformPrinterSupportPlugin>(loader(), keyMap.constBegin().value());
        if (printerSupport)
            qAddPostRoutine(cleanupPrinterSupport);
    }
    return printerSupport;
}

QT_END_NAMESPACE