--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/contextframework/cfw/inc/basicoperationsplugin/cfcontextoperation.h	Tue Feb 02 10:12:00 2010 +0200
@@ -0,0 +1,180 @@
+/*
+* Copyright (c) 2004-2008 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:  CCFContextOperation class declaration.
+*
+*/
+
+
+
+#ifndef C_CFCONTEXTOPERATION_H
+#define C_CFCONTEXTOPERATION_H
+
+// INCLUDES
+#include <e32base.h>
+#include <cfcontextobject.h>
+
+#include "cfoperationnode.h"
+#include "cfscriptlistener.h"
+
+// FORWARD DECLARATIONS
+
+// CLASS DECLARATION
+
+/**
+*  CCFContextOperation class is the base class for all Context Framework script
+*  operations that operate on contexts.
+*  All instances of this class are leaf nodes in operation tree.
+*
+*  @lib CFScriptEngine
+*  @since Series 60 2.6
+*/
+NONSHARABLE_CLASS( CCFContextOperation ): public CCFOperationNode,
+    public MCFScriptListener
+    {
+public: // Constructors and destructor
+
+    /**
+    * Destructor.
+    */
+    virtual ~CCFContextOperation();
+
+public: // Enumerations
+
+    enum TCmpType
+        {
+        EInvalidCmpType = -1,
+        EIntCmp,
+        EFloatCmp,
+        EPositionCmp,
+        ETimeCmp,
+        EStringCmp
+        };
+
+
+public: // From MCFScriptListener
+
+    /**
+    * Performs evaluation based on a context.
+    * @param aContext is the context for evaluation.
+    * @param aContextLevelDelay is storage for context level delay required by
+    *   the evaluation.
+    * @return ETrue if evaluation was performed and firing actions should be
+    *   considered based on clause conditions, EFalse otherwise.
+    */
+    TBool Evaluate( const CCFContextObject& aContext,
+            TInt& aContextLevelDelay );
+
+    /**
+    * Returns a context source this listener is interested in.
+    * @returns the source of the context.
+    */
+    TPtrC Source() const;
+
+    /**
+    * Returns a context type this listener is interested in.
+    * @returns the type of the context.
+    */
+    TPtrC Type() const;
+
+    /**
+    * Tests if this listener requires notification of all contexts.
+    * @returns ETrue if this listener is interested in all contexts,
+    *   EFalse otherwise.
+    */
+    TBool IsAllRequired() const;
+
+protected:
+
+    /**
+    * C++ default constructor.
+    */
+    CCFContextOperation( MCFOperationServices& aServices,
+            CCFOperationNode* aParent,
+            HBufC* aType,
+            HBufC* aSource );
+
+protected: // New functions
+
+    /**
+    * All concrete classes must implement this method.
+    * @param aContext is context that has changed.
+    * @return the result of the comparison.
+    */
+    virtual TBool IsTrueL( const CCFContextObject& aContext ) = 0;
+
+    /**
+    * Updates the previous value the operation was evaluated with.
+    * @param aNewValue is the new previous value.
+    * @return KErrNone when update was successful, KErrNoMemory if update failed
+    *   due to low memory.
+    */
+    TInt UpdatePreviousValue( const TDesC& aNewValue );
+
+    /**
+    * Gets the previous value the operation was evaluated with.
+    * @return the previous value the operation was evaluated with.
+    */
+    const TDesC& PreviousValue();
+
+protected: // From CCFOperationNode
+
+    /**
+    * Activates this node by subscribing to a context.
+    * @return None.
+    */
+    void ActivateL();
+
+    /**
+    * Deactivates this node by removing context subscription.
+    * @return None.
+    */
+    void Deactivate();
+
+    /**
+    * Asks this node to check its security (via services interface). For
+    * example, the security of contexts to be subscribed.
+    * @return KErrNone if security check passed, otherwise any of the system
+    *   wide error codes.
+    */
+    TInt CheckSecurity();
+
+private: // From CCFOperationNode
+
+    /**
+    * Called by child node, to ask the parent to re-evaluate its value,
+    * since the child's value has changed.
+    */
+    void Evaluate();
+
+protected: // Data
+
+    /**
+    * Context level delay for firing actions after evaluation
+    * (defined by contextRef).
+    */
+    TInt iContextLevelDelay;
+
+private: // Data
+
+    /**
+    * Context source and type as defined by contextRef for the operation.
+    */
+    HBufC* iSource;
+    HBufC* iType;
+
+    /** Previous context value. */
+    HBufC* iPreviousValue;
+    };
+
+#endif // C_CFCONTEXTOPERATION_H