// 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:

// RSqlMap template class declaration.

// 

//

#ifndef __SQLMAP_H__

#define __SQLMAP_H__

//Forward declaration

template <class KEY, class DATA, class REFCNTR, class DESTRUCTOR> class RSqlMap;

/**

(KEY, DATA, REFCNTR) template pair class used by RSqlMap template class.

The class has 3 template arguments:

 - KEY        - the key part of the pair object;

 - DATA       - the data part of the pair object;

 - REFCNTR    - the reference counting part of the pair object;

                REFCNTR class has to provide "TInt Increment()" and "TInt Decrement()" methods.

@see TSqlMapIterator

@see RSqlMap

@internalComponent

*/

template <class KEY, class DATA, class REFCNTR> 

NONSHARABLE_STRUCT(TSqlPair)

	{

	TSqlPair(const KEY& aKey, const DATA& aData);

	TSqlPair(const KEY& aKey);

	TSqlPair();

	KEY		iKey;

	DATA	iData;

	REFCNTR	iRefCounter;

	};

/**

TSqlMapIterator class. It describes an object which can be used as a 

forward, read-only iterator for RSqlMap containers.

The class has 4 template arguments:

 - KEY        - the key part of the pair object;

 - DATA       - the data part of the pair object;

 - REFCNTR    - the reference counting part of the pair object;

                REFCNTR class has to provide "TInt Increment()" and "TInt Decrement()" methods.

 - DESTRUCTOR - the KEY and DATA objects destroying part of the pair object;

				DESTRUCTOR class has to provide "void Destroy(KEY& aKey, DATA& aData)" method.

@see TSqlPair

@see RSqlMap

@internalComponent

*/

template <class KEY, class DATA, class REFCNTR, class DESTRUCTOR> 

NONSHARABLE_CLASS(TSqlMapIterator)

	{

public:

	TSqlMapIterator(const RSqlMap<KEY, DATA, REFCNTR, DESTRUCTOR>& aMap);

	TBool Next(TSqlPair<KEY, DATA, REFCNTR>& aPair) const;

private:

	const RSqlMap<KEY, DATA, REFCNTR, DESTRUCTOR>&	iMap;

	mutable TInt									iIndex;

	};

/**

RSqlMap template class describes an object that controls an ordered sequence of reference counted entries.

Each entry has a key of type KEY and an associated with it data of type DATA.

The class has 4 template arguments:

 - KEY        - the key part of the pair object;

 - DATA       - the data part of the pair object;

 - REFCNTR    - the reference counting part of the pair object;

                REFCNTR class has to provide "TInt Increment()" and "TInt Decrement()" methods.

 - DESTRUCTOR - the KEY and DATA objects destroying part of the pair object;

				DESTRUCTOR class has to provide "void Destroy(KEY& aKey, DATA& aData)" method.

The algorithm for determining the order of two entries is provided by a TLinearOrder

object, supplied by the client of RSqlMap during RSqlMap instance construction

(RSqlMap constructor, aOrder argument).

@see TSqlPair

@see TSqlMapIterator

@internalComponent

*/

template <class KEY, class DATA, class REFCNTR, class DESTRUCTOR> 

NONSHARABLE_CLASS(RSqlMap)

	{

	friend class TSqlMapIterator<KEY, DATA, REFCNTR, DESTRUCTOR>;

public:

	RSqlMap(const TLinearOrder< TSqlPair<KEY, DATA, REFCNTR> >& aOrder, const DESTRUCTOR& aDestructor);

	void Close();

	TInt Insert(const KEY& aKey, const DATA& aData);

	void Remove(const KEY& aKey);

	TSqlPair<KEY, DATA, REFCNTR>* Entry(const KEY& aKey);

private:

	TLinearOrder< TSqlPair<KEY, DATA, REFCNTR> >	iOrder;

	RArray< TSqlPair<KEY, DATA, REFCNTR> >			iSet;

	DESTRUCTOR 										iDestructor;

	};

#include "SqlMap.inl"

#endif//__SQLMAP_H__