// 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(MWsGraphicDrawerEnvironment& aEnvironment);

 	~CWsPluginManager();

 	CWsPlugin * CreatePluginL(const TDesC& aSection);

 	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(MWsGraphicDrawerEnvironment& aEnvironment);

 	void ConstructL();

 private:

 	RPointerArray<CPluginInfo> iPlugins;

 	MWsGraphicDrawerEnvironment& iEnvironment;

 	};

 /**

 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__