/****************************************************************************
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** This file is part of the QtGui module of the Qt Toolkit.
**
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** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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****************************************************************************/

#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
