// Copyright (c) 2007-2009 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 __WSPLUGINMANAGER_H__

#define __WSPLUGINMANAGER_H__

#include <e32base.h>

#include "Graphics/WSPLUGIN.H"

#include <Graphics/WSGRAPHICDRAWERINTERFACE.H>

/**

The window server has a single plugin manager object, which maintains the set

of loaded plugins.

*/

class CWsPluginManager : public CBase, public MWsPluginManager

	{

private:

	class CPluginInfo : public CBase

		{

	public:

		CPluginInfo();

		~CPluginInfo();

		CWsPlugin * iPlugin;

		};

public:

	static CWsPluginManager* NewL();

	~CWsPluginManager();

	void InitializePluginsL(MWsGraphicDrawerEnvironment& aEnvironment);	

	template <class T> T * FindImplementation(TInt & aStart);

	template <class T> T * FindNamedImplementation(const TDesC& aName);

public: // from MWsObjectProvider:

	TAny * ResolveObjectInterface(TUint aId);

public: // from MWsPluginManager

	TAny * ResolvePluginInterface(TUint aId);

private:

	CWsPluginManager();	

	void ConstructL();

	CWsPlugin * LoadPluginL(const TDesC& aSection);

private:

	RPointerArray<CPluginInfo> iPlugins;

	REComSession& iSession;

	};

/**

This searches for any plugin which implements a specified interface.

Calling this function modifies the value of aStart, and passing it back in

allows the next implementation to be found.

*/

template <class T> T * CWsPluginManager::FindImplementation(TInt & aStart)

	{

	while (aStart < iPlugins.Count())

		{

		T * impl = iPlugins[aStart]->iPlugin->ObjectInterface<T>();

		++aStart;

		if (impl)

			{

			return impl;

			}

		}

	return NULL;

	}

/**

This searches for any plugin which implements a specified interface and

has the specified name returned from PluginName.

Maybe plugin name should be a function on an MWsNamed class instead of CWsPlugin?

*/

template <class T> T * CWsPluginManager::FindNamedImplementation(const TDesC& aName)

	{

	TInt pos = 0;

	while (pos < iPlugins.Count())

		{

		T * impl = iPlugins[pos]->iPlugin->ObjectInterface<T>();

		if (impl && iPlugins[pos]->iPlugin->PluginName() == aName)

			{

			return impl;

			}

		++pos;

		}

	return NULL;

	}

#endif // __WSPLUGINMANAGER_H__