--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/idlefw/plugins/devicestatus/inc/aicontentobserveroptimizer.h	Thu Dec 17 08:54:17 2009 +0200
@@ -0,0 +1,140 @@
+/*
+* 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:  Active Idle Content Observer optimizer
+*
+*/
+
+
+#ifndef C_AIMULTICONTENTOBSERVEROPTIMIZER_H
+#define C_AIMULTICONTENTOBSERVEROPTIMIZER_H
+
+
+#include <e32base.h>
+#include "aicontentobserver.h"
+
+/**
+ *  @ingroup group_devicestatusplugin
+ *
+ * Active Idle Content Observer optimizer. 
+ * 
+ * Optimizes the Commit calls to different UI controllers. In 
+ * case nothing is published nothing is committed.
+ *
+ * @see MAiContentObserver
+ * @since S60 3.2
+ */
+class CAiContentObserverOptimizer : public CBase      
+    {
+
+private:
+    struct TAiPublishBlackList
+        {
+        TInt iContentId;
+        
+        TInt iIndex;              
+        };
+
+public:
+    static CAiContentObserverOptimizer* NewL(MAiContentObserver& aObserver);
+    ~CAiContentObserverOptimizer();
+    
+    /**
+     * Starts a transaction
+     * 
+     * @return KErrAlreadyExists in case transaction already ongoing. 
+     *         KErrNotSupported in case transaction not supported
+     *         KErrNone in case transaction succesfuly started
+     */
+    TInt StartTransaction( TInt aTxId );
+    
+    /**
+     * Commits a started transaction. In case no committing is needed
+     * (no publish calls has been made) the transaction is cancelled.
+     * 
+     * @return KErrNotReady in case no transaction is ongoing.
+     *         KErrNotSupported in case transaction not supported
+     *         KErrNone in case succesfully committed.
+     */         
+    TInt Commit( TInt aTxId );
+    
+    /**
+     * Cancels a transactions in case a transaction was started.
+     * 
+     * @return KErrNotReady in case no transaction is ongoing.
+     *         KErrNotSupported in case transactions are not supported
+     *         KErrNone in case transaction succesfully cancelled     
+     */
+    TInt CancelTransaction( TInt aTxId );
+    
+    /*
+     * @see MAiContentObserver
+     */
+    TBool CanPublish( MAiPropertyExtension& aPlugin, TInt aContent, TInt aIndex );
+    
+    /**
+     * @see MAiContentObserver
+     */
+    TInt Publish( MAiPropertyExtension& aPlugin, TInt aContent,
+                  TInt aResource, TInt aIndex );
+
+    /**
+     * @see MAiContentObserver
+     */
+    TInt Publish( MAiPropertyExtension& aPlugin, TInt aContent,
+                  const TDesC16& aText, TInt aIndex );
+    /**
+     * @see MAiContentObserver
+     */
+    TInt Publish( MAiPropertyExtension& aPlugin, TInt aContent,
+                  const TDesC8& aBuf, TInt aIndex );
+
+    /**
+     * @see MAiContentObserver
+     */
+    TInt Publish( MAiPropertyExtension& aPlugin, TInt aContent,
+                  RFile& aFile, TInt aIndex );
+    /**
+     * @see MAiContentObserver
+     */
+    TInt Clean( MAiPropertyExtension& aPlugin, TInt aContent, TInt aIndex );
+
+    /**
+     * Returns the actual content observer.
+     */
+    MAiContentObserver& Observer() const;
+    
+private:
+    CAiContentObserverOptimizer(MAiContentObserver& aObserver);
+
+    TInt AddToBlackList( TInt aContentId, TInt aIndex );
+
+    TBool IsInBlackList( TInt aContentId, TInt aIndex ) const;
+
+private: // data
+
+    /**
+     * Handle to the observer that receives
+     * the publish calls.
+     */
+    MAiContentObserver &iObserver;
+    
+    TBool iCommitNeeded;
+
+    TBool iTransactionStarted;
+    
+    RArray<TAiPublishBlackList> iBlackList;
+    };
+
+
+#endif // C_AIMULTICONTENTOBSERVEROPTIMIZER_H