--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/upnpavcontroller/upnpavcontrollerhelper/inc/upnpabstractrenderingsessionobserver.h	Thu Dec 17 08:52:00 2009 +0200
@@ -0,0 +1,174 @@
+/*
+* Copyright (c) 2007 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:      An abstract proxy for a rendering session observer
+*
+*/
+
+
+
+
+
+
+#ifndef UPNPABSTRACTRENDERINGSESSIONOBSERVER_H
+#define UPNPABSTRACTRENDERINGSESSIONOBSERVER_H
+
+//  INCLUDES
+#include <e32base.h>
+#include "upnpavrenderingsessionobserver.h" // base class
+
+// FORWARD DECLARATIONS
+class MUPnPAVRenderingSession;
+
+// CLASS DECLARATION
+
+/**
+* An abstract class for implementing a rendering session observer.
+* This class is purposed as a base class for imnplementing a
+* rendering session observer. There are 2 main use cases:
+* 1. reducing implementation code so that the actual observer will
+*    only need to write the observer methods that are really used.
+* 2. implementing an observer proxy that will attach itself to a session
+*    and just handle some of the callbacks and forward a majority of the
+*    callbacks the original session observer.
+*
+* @lib upnpavcontrollerhelper.lib
+* @since S60 3.2
+*/
+class CUPnPAbstractRenderingSessionObserver
+    : public CBase
+    , public MUPnPAVRenderingSessionObserver
+    {
+
+public: // construction/destruction
+
+    /**
+     * default constructor.
+     */
+    IMPORT_C CUPnPAbstractRenderingSessionObserver();
+
+    /**
+     * destructor
+     */
+    IMPORT_C virtual ~CUPnPAbstractRenderingSessionObserver();
+
+
+public: // the abstract observer interface
+
+    /**
+     * Sets the host session for the observer. This is the session where
+     * the observer will register for callbacks. If the session already
+     * has an observer, it will become the proxy observer. The default
+     * implementatin for all observer methods is to forward the method to
+     * the observer, if it exists.
+     *
+     * @since S60 3.2
+     * @param aHostSession, rendering session
+     */
+    IMPORT_C void SetSession( MUPnPAVRenderingSession& aHostSession );
+
+    /**
+     * Enables receiving callbacks. When enabled, the abstract observer
+     * registers to the given session and thus starts receiving callbacks.
+     * Note that only those callbacks that are overwritten in the derived
+     * class will actually provide some value. Other will be either processed
+     * in an empty method, or forwarded to the observer that previously was
+     * registered as an observer (proxy mode)
+     *
+     * @since S60 3.2
+     */
+    IMPORT_C void EnableSessionObserver();
+
+    /**
+     * Disables receiving session callbacks. The observer interface is
+     * deregistered, and if before observer registration there was an 
+     * original observer interface (proxy mode) the original observer
+     * is restored.
+     *
+     * @since S60 3.2
+     */
+    IMPORT_C void DisableSessionObserver();
+
+    /**
+     * Returns true if the observer is active (registered for events)
+     *
+     * @since S60 3.2
+     */
+    IMPORT_C TBool IsSessionObserverEnabled();
+
+public: // MUPnPAVRenderingSessionObserver
+
+    /**
+     * see MUPnPAVRenderingSessionObserver
+     */
+    void VolumeResult( TInt aError, TInt aVolumeLevel,
+        TBool aActionResponse );
+
+    /**
+     * see MUPnPAVRenderingSessionObserver
+     */
+    void MuteResult( TInt aError, TBool aMute,
+        TBool aActionResponse );
+
+    /**
+     * see MUPnPAVRenderingSessionObserver
+     */
+    void InteractOperationComplete( TInt aError,
+        TUPnPAVInteractOperation aOperation );
+
+    /**
+     * see MUPnPAVRenderingSessionObserver
+     */
+    void PositionInfoResult( TInt aError,
+        const TDesC8& aTrackPosition, const TDesC8& aTrackLength );
+
+    /**
+     * see MUPnPAVRenderingSessionObserver
+     */
+    void SetURIResult( TInt aError );
+
+    /**
+     * see MUPnPAVRenderingSessionObserver
+     */
+    void SetNextURIResult( TInt aError );
+
+    /**
+     * see MUPnPAVRenderingSessionObserver
+     */
+    void MediaRendererDisappeared(
+        TUPnPDeviceDisconnectedReason aReason );
+
+    /**
+     * see MUPnPAVRenderingSessionObserver
+     */
+    void ReserveLocalMSServicesCompleted( TInt aError );
+
+
+private: // members
+
+    // the host rendering session. Note: NOT OWNED!
+    MUPnPAVRenderingSession* iObservedSession;
+
+    // The proxy observer. Note: NOT OWNED!
+    MUPnPAVRenderingSessionObserver* iProxyObserver;
+
+    // if observer is enabled
+    TBool iObserverEnabled;
+
+    };
+
+
+#endif  // UPNPABSTRACTRENDERINGSESSIONOBSERVER_H
+
+// End of File
+