/*

 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description:

 *

 */

/*!

 \class NmApiDataPluginFactory

 \brief The NmApiDataPluginFactory class creates NmDataPlugin instance.

 */

NmApiDataPluginFactory *NmApiDataPluginFactory::mInstance = NULL;

int NmApiDataPluginFactory::mReferenceCount = 0;

QObject *NmApiDataPluginFactory::mPlugin = NULL;

QPluginLoader *NmApiDataPluginFactory::mPluginLoader = NULL;

/*!

 */

NmApiDataPluginFactory::NmApiDataPluginFactory()

{

    NM_FUNCTION;

}

/*!

 */

NmApiDataPluginFactory::~NmApiDataPluginFactory()

{

    NM_FUNCTION;

    if (mPlugin) {

        delete mPlugin;

        mPlugin = NULL;

    }

    if(mPluginLoader){

        delete mPluginLoader;

        mPluginLoader = NULL;

    }

}

/*!

 */

NmApiDataPluginFactory *NmApiDataPluginFactory::instance()

{

    NM_FUNCTION;

    if (!mInstance) {

        mInstance = new NmApiDataPluginFactory();

    }

    mReferenceCount++;

    return mInstance;

}

/*!

 */

void NmApiDataPluginFactory::releaseInstance(NmApiDataPluginFactory *&instance)

{

    NM_FUNCTION;

    //can't have passed out instances if we don't have any

    if (mInstance) {

        if (instance == mInstance) {

            instance = NULL;

            mReferenceCount--;

        }

        if (0 >= mReferenceCount) {

            delete mInstance;

            mInstance = NULL;

        }

    }

}

/*!

 */

NmDataPluginInterface *NmApiDataPluginFactory::interfaceInstance()

{

    NM_FUNCTION;

    if (!mPlugin) {

        mPlugin = loadPlugin();

    }

    return qobject_cast<NmDataPluginInterface*> (mPlugin);

}

/*!

 */

QObject *NmApiDataPluginFactory::loadPlugin()

{

    NM_FUNCTION;

    if (!mPluginLoader) {

        const QString KPluginDirectory = "c:\\resource\\plugins";

        QDir pluginDir = QDir(KPluginDirectory);

        const QString KFrameworkPluginName = "nmframeworkadapter.qtplugin";

        /*!

         This creates plugin entity.

         */

        mPluginLoader = new QPluginLoader(pluginDir.absoluteFilePath(KFrameworkPluginName));

        mPlugin = mPluginLoader->instance();

        if(!mPlugin){

            // We don't have proper plugin instance, so we don't need it's loader.

            delete mPluginLoader;

            mPluginLoader = NULL;

        }

    }

    return mPlugin;

}

QObject *NmApiDataPluginFactory::plugin()

{

    NM_FUNCTION;

    if (!mPlugin) {

        mPlugin = loadPlugin();

    }

    return mPlugin;

}