// 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 the License "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:///** @file @internalComponent @released*/#ifndef STREAMAGENTRESOLVER_H#define STREAMAGENTRESOLVER_H#include <e32base.h>#include <ecom/ecom.h>#include "streamagentinfo.h"namespace StreamAccess { class CStreamAgentInfo; /** * Responsible for the identification of stream agent ECOM plug-in implementations and * the selection of the most appropriate agent based on the key stream session description * metadata and plug-in resource file information. */ class CStreamAgentResolver : public CBase { public: /* Constructs a new instance of CStreamAgentResolver and pushs it onto the cleanup stack * @return Pointer to the new CStreamAgentResolver object */ static CStreamAgentResolver* NewLC(); /* Destructor */ ~CStreamAgentResolver(); /* Resolves a stream agent by the SDP (Session Description Protocol) media description * of the key stream. * @param aSdpKeyStream SDP media description of the key stream * @return Reference to the CStreamAgentInfo instance for the chosen Stream Agent, capable * of decoding the key stream. * NOTE: The lifetime of the returned reference is limited by the lifetime of the resolver. * The CStreamAgentInfo reference cannot be used after the CStreamAgentResolver object is * destroyed. * @leave KErrCANoAgent No stream agent can be found that supports the given SDP key management * description * @leave One of the system-wide error codes */ CStreamAgentInfo& ResolveSdpKeyStreamL(const CSdpMediaField& aSdpKeyStream) const; protected: /* Constructor */ CStreamAgentResolver(); /* Second phase of construction for CStreamAgentResolver */ void ConstructL(); private: /* Constructs a list of information about plug-in implementations located * by the ECOM framework that satisfy the stream agent interface. */ void BuildStreamAgentListL(); /* Adds a new instance of a stream agent to the CStreamAgentInfo array * @param aAgentInfo Registration data regarding the stream agent interface implementation, * retrieved from the associated resource file */ void AddStreamAgentL(const CImplementationInformation& aAgentInfo); /* Cleanup Item Operation used when constructing the stream agent list via ECOM * @param aArray Pointer to an RImplInfoPtrArray array which is used by ECOM to store * information about located stream agents implementations */ static void CleanAgentImplArray(TAny* aArray); private: /* Array of information regarding stream agent interface implementations located by ECOM */ RPointerArray<CStreamAgentInfo> iStreamAgentInfoArray; }; } // namespace StreamAccess#endif /*STREAMAGENTRESOLVER_H*/