/*

 * Copyright (c) 2010 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:

 *     The header file for mde tone fetcher.

 *

 */

#ifndef MSGAUDIOSELECTIONENGINE_H

#define MSGAUDIOSELECTIONENGINE_H

// SYSTEM INCLUDES

#include <mdesession.h>

#include <mdequery.h>

#include <mdelogiccondition.h>

#include <mdeconstants.h>

#include <mdeobjectquery.h>

#include <mdccommon.h>

#include <mdeitem.h>

#include <mdeobject.h>

#include <e32base.h>

#include <QObject>

#include <QStringList>

// FORWARD DECLARATIONS

/**

 *  This class is used for quering tones from mde.

 */

class MsgAudioSelectionEngine : public QObject,

        public CBase,

        public MMdESessionObserver,

        public MMdEQueryObserver,

        public MMdEObjectObserver,

        public MMdEObjectPresentObserver

{

Q_OBJECT

public:

    enum TStorageType

        {

        EPhoneMemory = 0, ERomStorage, EMassStorage, EMemoryCard

        };

    enum TQueryAttribute

        {

        EAttrMediaType = 20, // integer

        EAttrFileSize, // integer

        EAttrStorageType, // integer

        EAttrMediaFileId, // integer

        EAttrFileName, // string

        EAttrFullName, // string

        EAttrSongName, // string

        EAttrArtist, // string

        EAttrAlbum, // string

        EAttrGenre, // string

        EAttrComposer

        // string

        };

public:

    MsgAudioSelectionEngine();

    virtual ~MsgAudioSelectionEngine();

    void CreateMetaDataSession();

signals:

    void mdeSessionOpened();

    void mdeSessionError(int error);

    void queryComplete(QStringList nameList, QStringList uriList);

    void queryError(int error);

    void notifyObjectChanged();

public:

    static CMdEPropertyDef& PropertyDefL(CMdESession* aSession, TInt aAttr);

    void QueryTones();

    void SetAttr(int attr, int value);

private:

    void LeaveIfSessionClosedL();

    CMdEPropertyDef& PropertyDefL(TInt aAttr);

    void QueryTonesL();

    void HandleQueryCompletedL(CMdEQuery& aQuery, TInt aError);

private:

    // from MMdESessionObserver

    void HandleSessionOpened(CMdESession& aSession, TInt aError);

    void HandleSessionError(CMdESession& aSession, TInt aError);

private:

    // from MMdEQueryObserver (mdequery.h)

    void HandleQueryNewResults(CMdEQuery& aQuery, TInt aFirstNewItemIndex,

            TInt aNewItemCount);

    void HandleQueryCompleted(CMdEQuery& aQuery, TInt aError);

private:

    // from MMdEObjectObserver

    void HandleObjectNotification(CMdESession& aSession,

            TObserverNotificationType aType,

            const RArray<TItemId>& aObjectIdArray);

private:

    // from MMdEObjectPresentObserver

    void HandleObjectPresentNotification(CMdESession& aSession,

            TBool aPresent, const RArray<TItemId>& aObjectIdArray);

    void AddObjectObserverL();

private:

    // session to metadata engine

    CMdESession* iSession;

    // metadata query

    CMdEObjectQuery* iQuery;

    // used for saving the quering result.

    //both name and uri.

    QStringList iNameList;

    QStringList iUriList;

    // is metadata session open

    TBool iSessionOpen;

    // max audio file file size

    TInt iMaxFileSize;

    // query error

    TInt iQueryError;

};

#endif /* MSGAUDIOSELECTIONENGINE_H */