diff -r fe894bb075c2 -r 79f826a55db2 mds_plat/context_engine_plugin_api/inc/contextplugin.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mds_plat/context_engine_plugin_api/inc/contextplugin.h	Wed Oct 06 15:08:08 2010 +0300
@@ -0,0 +1,128 @@
+/*
+* Copyright (c) 2006-2009 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:  Definition of the Context plug-in ECom interface.
+*
+*/
+
+#ifndef CCONTEXTPLUGIN_H
+#define CCONTEXTPLUGIN_H
+
+#include <e32base.h>
+#include <implementationinformation.h>
+
+// forward declarations
+class CMdEObject;
+class CMdESession;
+class CHarvesterData;
+
+/** Uid for this interface */
+const TUid KCContextPluginInterfaceUid = { 0x200009F7 };
+
+class MContextPluginObserver
+	{
+public:
+    /**
+     * A pure virtual method intended to inform about completion of context
+     * plug-in initialization. Symbian error codes are used.
+     *
+     * @param aErrorCode  Error code for error occurred during initialization.
+     */
+    virtual void PluginInitializationStatus( TInt aErrorCode ) = 0;
+
+    /**
+     * A pure virtual method intended to inform about context snapshot taking completion.
+     * Symbian error codes are used.
+     *
+     * @param aErrorCode  Error code for error occurred while taking the snapshot.
+     */
+    virtual void PluginSnapshotStatus( CHarvesterData* aHD ) = 0;
+    };
+
+
+/**
+* This class implements the context plugin interface.
+*/
+class CContextPlugin : public CBase
+    {
+public:
+
+    /**
+     * Creates an implementation of a desired implementation defined by the parameter.
+     *
+     * @param aUid 
+     * @return A pointer to the created plug-in.
+     */
+    IMPORT_C static CContextPlugin* NewL( const TUid& aUid );
+    
+    /**
+     * Destroys the implementation. This is virtual method
+     * and this class is not intended for derivation, so not exported.
+     */
+    IMPORT_C virtual ~CContextPlugin();
+
+    /**
+     * Lists all available implementations which implement this interface.
+     *
+     * @param[out] aImplInfoArray A list of existing implementations of the interface.
+     */
+    IMPORT_C static void ListImplementationsL( RImplInfoPtrArray& aImplInfoArray );
+
+    /**
+     * A pure virtual interface method to initialize the plug-in.
+     *
+     * @param aObserver An interface class to inform about initialization completion.
+     */
+    virtual void Init( MContextPluginObserver& aObserver ) = 0;
+
+    /**
+     * Set a pointer to MdESession.
+     * Session is used to store harvested context data.
+     *
+     * @param aSession Session pointer to set.
+     */
+    virtual void SetMdeSession( CMdESession& aSession ) = 0;
+
+    /**
+     * This pure virtual method takes the context snapshot for one metadata object
+     * and writes the information to the object received as parameter.
+     * The observer will be informed about the status of the operation.
+     *
+     * @param aObserver  An interface class to inform about finishing context snapshot.
+     * @param aMetadataObject An object to take the snapshot for.
+     */
+    virtual void ContextSnapshot( MContextPluginObserver& aObserver, CHarvesterData& aHD ) = 0;
+
+    /**
+     * This pure virtual method takes the context snapshot for several
+     * metadata object and writes the information to the all the objects received as parameter.
+     * The observer will be informed about the status of the operation.
+     *
+     * @param aObserver  An interface class to inform about finishing context snapshot.
+     * @param aMetadataObjectArray Array of objects to take the snapshot for.
+     */
+    virtual void ContextSnapshot( MContextPluginObserver& aObserver,
+                          RPointerArray<CHarvesterData>& aHDArray ) = 0;
+
+private: // data
+
+    /** 
+     * Instance identifier key. When instance of an implementation is created
+     * by ECOM framework, the framework will assign UID for it.
+     * The UID is used in destructor to notify framework that this instance is
+     * being destroyed and resources can be released.
+     */
+    TUid iDtor_ID_Key;
+    };
+
+#endif // CCONTEXTPLUGIN_H