--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ncdengine/inc/ncdinstalloperationobserver.h	Thu Dec 17 08:51:10 2009 +0200
@@ -0,0 +1,102 @@
+/*
+* Copyright (c) 2006 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 definition for install operations
+*
+*/
+	
+
+#ifndef M_NCD_INSTALL_OPERATION_OBSERVER_H
+#define M_NCD_INSTALL_OPERATION_OBSERVER_H
+
+#include <e32cmn.h>
+
+class MNcdInstallOperation;
+class TNcdProgress;
+class MNcdQuery;
+
+/**
+ *  Observer interface for install operations
+ *
+ *  Install operation users should implement this interface to be able to
+ *  receive callbacks.
+ *
+ *  
+ *  @see MNcdInstallOperation
+ */
+class MNcdInstallOperationObserver
+    {
+    
+public:
+     
+     
+    /**
+     * Called when install has progressed. 
+     *
+     * @note This will be called only once per an installed file. 
+     * The reason for this is that the install process is handled outside of
+     * Catalogs Engine in the platform installer.
+     *
+     * 
+     * @param aOperation The operation that sent the event.
+     * @param aProgress Progress of the operation.
+     */
+    virtual void InstallProgress( MNcdInstallOperation& aOperation,
+        TNcdProgress aProgress ) = 0;
+
+    /**
+     * Called when a query has been received for an operation.
+     *
+     * @note Querys need to be completed with MNcdOperation::CompleteQueryL()
+     *       to continue the operation! Alternatively, the operation must be
+     *       cancelled.
+     * 
+     * 
+     * @see MNcdOperation
+     * @see MNcdQuery
+     * @param aOperation Uncounted reference to the operation that sent the event.
+     * @param aQuery Pointer to the query that must be completed. Counted, Release()
+     *        must be called after use.
+     * @see MNcdOperation::CompleteQueryL()
+     */
+    virtual void QueryReceived( MNcdInstallOperation& aOperation,
+        MNcdQuery* aQuery ) = 0;
+
+    /**
+     * Called when an operation has been completed.
+     *
+     * 
+     * @param aOperation The operation that sent the event.
+     * @param aError Error code for operation completion. 
+     *               KErrNone for successful completion, KErrAbort if the user
+     *               cancelled the operation, otherwise a system
+     *               wide error code.
+     */
+    virtual void OperationComplete( MNcdInstallOperation& aOperation,
+        TInt aError ) = 0;
+
+
+protected:
+
+    /**
+     * Destructor
+     *
+     * An empty virtual destructor is implemented to prevent deletion 
+     * of a class object through this interface.
+     * Observer should not be deleted by the one that is observed.
+     */
+    virtual ~MNcdInstallOperationObserver() { }
+    
+    };
+    
+#endif //  M_NCD_INSTALL_OPERATION_OBSERVER_H