/*

* 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:  

*

*/

#ifndef __CCOMPONENTMANAGER_H__

#define __CCOMPONENTMANAGER_H__

/****************************************************************************************

 * 

 * System Includes

 * 

 ***************************************************************************************/

#include <stdio.h>

#include <assert.h>

/****************************************************************************************

 * 

 * Local Includes

 * 

 ***************************************************************************************/

/****************************************************************************************

 * 

 * Class CComponentManager

 * 

 ***************************************************************************************/

template <class T>

class CComponentManager

{

public:

	CComponentManager( int aMaxComponents )

	{

		// check params

		assert( aMaxComponents > 0 );

		// set the state

		iComponentCount = 0;

		iMaxComponents = aMaxComponents;

		iComponentList = (T**)calloc( iMaxComponents, sizeof(T*) );

		assert( iComponentList != NULL );

	}

	~CComponentManager()

	{

		assert( iComponentCount == 0 );

		free( iComponentList );

	}

	int CreateInstance() 

	{

		int i;

		// make sure there is room

		if( iComponentCount == iMaxComponents ) {

			return ERR_CANNOT_CREATE_NEW_INSTANCE;

		}

		// find a free index

		for( i = 0; i < iMaxComponents; i++ ) {

			if( iComponentList[i] == NULL )

				break;

		}

		assert( i < iMaxComponents );

		// create the new instance

		iComponentList[i] = new T();

		assert( iComponentList[i] != NULL );

		// set the key

		(iComponentList[i])->SetKey( i );

		// update the count

		iComponentCount++;

		// done - return the key

		return i;

	}

	int DeleteInstance( int aInstanceKey )

	{

		int is_key_valid;

		// check that the key is valid

		is_key_valid = IsValidKey( aInstanceKey );

		assert( is_key_valid != 0 );

		// verify the key

		assert( (iComponentList[aInstanceKey])->GetKey() == aInstanceKey );

		// delete the instace

		delete (iComponentList[aInstanceKey]);

		iComponentList[aInstanceKey] = NULL;

		iComponentCount--;

		// done

		return ERR_NONE;

	}

	int IsValidKey( int aInstanceKey )

	{

		return ((aInstanceKey >= 0) && (aInstanceKey < iMaxComponents) && (iComponentList[aInstanceKey] != NULL) );

	}

	T *GetInstance( int aInstanceKey )

	{

		// validate the param

		if( (aInstanceKey < 0) || (aInstanceKey >= iMaxComponents) ) {

			return NULL;

		}

		return iComponentList[aInstanceKey];

	}

	int GetInstanceCount()

	{

		return iComponentCount;

	}

	int DeleteAllInstances()

	{

		int i, err;

		for( i = 0; i < iMaxComponents; i++ ) {

			if( iComponentList[i] != NULL ) {

				err = DeleteInstance( i );

				assert( err == ERR_NONE );

			}

		}

		assert( iComponentCount == 0 );

		return ERR_NONE;

	}

private:

	int iComponentCount;

	int iMaxComponents;

	T **iComponentList;

};

#endif //__CCOMPONENTMANAGER_H__