diff -r 000000000000 -r 094583676ce7 PECengine/IncApi/MPEngPresenceObserver2.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PECengine/IncApi/MPEngPresenceObserver2.h	Thu Dec 17 08:41:52 2009 +0200
@@ -0,0 +1,122 @@
+/*
+* Copyright (c) 2004 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:  Observer interface to receive presence change notifications.
+*
+*/
+
+#ifndef __MPENGPRESENCEOBSERVER2_H
+#define __MPENGPRESENCEOBSERVER2_H
+
+//  INCLUDES
+#include <E32Std.h>
+
+
+//FORWARD DECLARATIONS
+class CPEngPresenceNotifier2;
+class CPEngTrackedPresenceIDs2;
+
+
+
+// CLASS DECLARATION
+
+/**
+ * Observer interface to receive presence change notifications.
+ * Observer is registered to CPEngPresenceNotifier2.
+ *
+ * With this API clients can
+ * 1. Receive notifications from changes in cached
+ *    presence attributes. Cached presence attributes
+ *    are subscribed or fetched presence attributes
+ *    stored to presence cache.
+ *
+ * 2. Receive notifications from user own attribute changes.
+ *    Notification from user own attributes is requested with
+ *    zero length PresenceID and they are also delivered with
+ *    zero length PresenceID.
+ *
+ * @since 3.0
+ */
+class MPEngPresenceObserver2
+    {
+
+    public: //Observer methods
+
+        /**
+         * Presence change handler.
+         *
+         * Called by CPEngPresenceNotifier2 to handle presence
+         * changed events. If this method leaves, error code is
+         * reported back to HandlePresenceError().
+         *
+         * @since 3.0
+         * @param aNotifier The notifier source where notification
+         *        is coming from. No ownership transferred.
+         * @param aChangedPresenceIDs The list of tracked Presence IDs.
+         *        List contains both all tracked Presence IDs and changed
+         *        Presence IDs. See CPEngTrackedPresenceIDs2 how to iterate
+         *        through wanted Presence IDs. No ownership transferred.
+         */
+        virtual void HandlePresenceChangeL(
+            CPEngPresenceNotifier2& aNotifier,
+            CPEngTrackedPresenceIDs2& aChangedPresenceIDs ) = 0;
+
+
+        /**
+         * Notification failure handler.
+         *
+         * @since 3.0
+         *
+         * @param aError The error resulting from Presence Engine internal
+         *        presence change event handling (e.g. out of memory) or
+         *         leave error from HandlePresenceChangeL().
+         * @param aNotifier The notifier of which event handling failed.
+         *        No ownership transferred.
+         */
+        virtual void HandlePresenceError(
+            TInt aError,
+            CPEngPresenceNotifier2& aNotifier ) = 0;
+
+
+
+    private: //Extensions
+
+        /**
+         * Reserved virtual table slots for future use.
+         * Do not implement this.
+         *
+         * @since 3.0
+         */
+        virtual TInt PresenceObserverReserved() {
+            return KErrNotSupported;
+            }
+
+
+
+    protected:  //Destructor
+
+        /**
+         * Protected destructor.
+         * Observers can't be destroyed via this interface.
+         */
+        virtual ~MPEngPresenceObserver2() { }
+
+
+    };
+
+#endif //__MPENGPRESENCEOBSERVER2_H
+
+
+// End of File
+
+