/*

* Copyright (c) 2005-2009 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:  Implementation of object, relation and event query

*

*/

#ifndef __MDEQUERYIMPL_H__

#define __MDEQUERYIMPL_H__

#include "mdeobjectquery.h"

#include "mderelationquery.h"

#include "mdeeventquery.h"

// Forward declaration

class CMdESessionImpl;

class CMdENamespaceDef;

class CMdEObjectDef;

class RMdEEngineSession;

class CMdEAsynchronousFindAO;

/**

 * Object query implementation.

 */

NONSHARABLE_CLASS(CMdEObjectQueryImpl) : public CMdEObjectQuery

	{

public:

    /* Constructors and destructor. */

	/**

	 * Two-phased constructor.

	 */

	static CMdEObjectQueryImpl* NewL( CMdESessionImpl& aSessionImpl, CMdENamespaceDef& aNamespaceDef, 

			CMdEObjectDef& aObjectDef, RPointerArray<CMdEObjectDef>* aObjectDefs,

			RMdEEngineSession& aSession );

	static CMdEObjectQueryImpl* NewLC( CMdESessionImpl& aSessionImpl, CMdENamespaceDef& aNamespaceDef, 

			CMdEObjectDef& aObjectDef, RPointerArray<CMdEObjectDef>* aObjectDefs,

			RMdEEngineSession& aSession );

	/**

	 * Destructor.

	 */

	virtual ~CMdEObjectQueryImpl();

    /* Methods. */

    /**

     * As in CMdEQuery.

	 */

    void DoFindL( TUint aMaxCount, TUint aNotifyCount );

    /**

     * Notifies results

	 */

    void DoNotifyResultsL( RPointerArray<CMdEInstanceItem>& aResultList );

    /**

     * Notifies results of id query

	 */

    void DoNotifyResultsL( RArray<TItemId>& aResultIdList );

    /**

     * Notifies result of distinct values query

     */

    void DoNotifyResultsL( CDesCArray& aResults );

    /**

     * Notifies result of count query

	 */

    void DoNotifyResults( TInt aResultCount );

    /**

     * Notifies query completed

	 */

    void DoNotifyCompleted( TInt aError );

protected:

    /**

     * As in CMdEQuery.

     */

    void DoCancel();

private:

	/**

	 * Constructor. Note that new queries should be created using the factory

	 * @param aSessionImpl the session

	 */

	CMdEObjectQueryImpl( CMdESessionImpl& aSessionImpl, CMdENamespaceDef& aNamespaceDef, 

			CMdEObjectDef& aObjectDef, RPointerArray<CMdEObjectDef>* aObjectDefs );

	/**

	 * Second-phase constructor.

	 * @param aSession reference to the engine session

	 */

	void ConstructL( CMdESessionImpl& aSessionImpl, RMdEEngineSession& aSession );

private:

	/** Asynchronous find support. */

	CMdEAsynchronousFindAO* iAsyncFind;

    };

/**

 * Relation query stub implementation.

 */

class CMdERelationQueryImpl

    : public CMdERelationQuery

	{

public:

    /* Constructors and destructor. */

	/**

	 * Two-phased constructor.

	 */

	static CMdERelationQueryImpl* NewL( CMdESessionImpl& aSessionImpl,

			CMdENamespaceDef& aNamespaceDef, RMdEEngineSession& aSession );

	static CMdERelationQueryImpl* NewLC( CMdESessionImpl& aSessionImpl,

			CMdENamespaceDef& aNamespaceDef, RMdEEngineSession& aSession );

	/**

	 * Destructor.

	 */

	virtual ~CMdERelationQueryImpl();

    /* Methods from CMdERelationQuery. */

    /**

     * As in CMdEQuery.

	 */

    void DoFindL( TUint aMaxCount, TUint aNotifyCount );

    /**

     * Notifies results

	 */

    void DoNotifyResultsL( RPointerArray<CMdEInstanceItem>& aResultList );

    /**

     * Notifies results of id query

	 */

    void DoNotifyResultsL( RArray<TItemId>& aResultIdList );

    /**

     * Notifies result of count query

	 */

    void DoNotifyResults( TUint32 aResultCount );

    /**

     * Notifies query completed

	 */

    void DoNotifyCompleted( TInt aError );

protected:

    /**

     * As in CMdEQuery.

     */

    void DoCancel();

private:

	/**

	 * Constructs a new relation query in the specified session.

	 * @param aSessionImpl the session

	 */

	CMdERelationQueryImpl( CMdESessionImpl& aSessionImpl, CMdENamespaceDef& aNamespaceDef );

	/**

	 * Second-phase constructor.

	 * @param aSession reference to the engine session

	 */

	void ConstructL( CMdESessionImpl& aSessionImpl, RMdEEngineSession& aSession );

private:

	/** Asynchronous find support. */

	CMdEAsynchronousFindAO* iAsyncFind;

    };

/**

 * Event query implementation.

 */

class CMdEEventQueryImpl: public CMdEEventQuery

	{

public:

    /* Constructors and destructor. */

	static CMdEEventQueryImpl* NewL( CMdESessionImpl& aSessionImpl,

		CMdENamespaceDef& aNamespaceDef, RMdEEngineSession& aSession );

	static CMdEEventQueryImpl* NewLC( CMdESessionImpl& aSessionImpl,

		CMdENamespaceDef& aNamespaceDef, RMdEEngineSession& aSession );

	/**

	 * Destructor.

	 */

	virtual ~CMdEEventQueryImpl();

    /* Methods from CMdEEventQuery. */

    /**

     * As in CMdEQuery.

	 */

    void DoFindL( TUint aMaxCount, TUint aNotifyCount );

    /**

     * Notifies results

	 */

    void DoNotifyResultsL( RPointerArray<CMdEInstanceItem>& aResultList );

    /**

     * Notifies results of id query

	 */

    void DoNotifyResultsL( RArray<TItemId>& aResultIdList );

    /**

     * Notifies result of count query

	 */

    void DoNotifyResults( TUint32 aResultCount );

    /**

     * Notifies query completed

	 */

    void DoNotifyCompleted( TInt aError );

protected:

    /**

     * As in CMdEQuery.

     */

    void DoCancel();

private:

	/**

	 * Constructs a new event query in the specified session.

	 * @param aSessionImpl the session

	 */

	CMdEEventQueryImpl( CMdESessionImpl& aSessionImpl, CMdENamespaceDef& aNamespaceDef );

	/**

	 * Second-phase constructor. 

	 * @param aSession reference to the engine session

	 */

	void ConstructL( CMdESessionImpl& aSessionImpl, RMdEEngineSession& aSession );

private:

	/** Asynchronous find support. */

	CMdEAsynchronousFindAO* iAsyncFind;

	};

#endif  // __MDEQUERYIMPL_H__