diff -r 1a6714c53019 -r cce62ebc198e radioengine/utils/inc/cradiopropertyobserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/radioengine/utils/inc/cradiopropertyobserver.h	Tue Aug 31 15:15:02 2010 +0300
@@ -0,0 +1,244 @@
+/*
+* Copyright (c) 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:
+*
+*/
+
+#ifndef CRADIOPROPERTYOBSERVER_H
+#define CRADIOPROPERTYOBSERVER_H
+
+#include <e32base.h>
+#include <e32property.h>
+
+/**
+ * MRadioPropertyChangeObserver
+ *
+ * Abstract interface for handling property change events.
+ */
+class MRadioPropertyChangeObserver
+{
+
+public:
+
+    /**
+     * This is a callback function which is called when a property value of
+     * type int is changed.
+     *
+     * @param aCategory UID of Publish And Subscribe category
+     * @param aKey subkey to specify the category event; to be used with
+     * Publish And Subscribe
+     *
+     * @param aValue the new value
+     */
+    virtual void HandlePropertyChangeL(
+        const TUid& aCategory,
+        const TUint aKey,
+        const TInt aValue ) = 0;
+
+    /**
+     * This is a callback function which is called when a property value of
+     * type byte array is changed.
+     *
+     * @param aCategory UID of Publish And Subscribe category
+     * @param aKey subkey to specify the category event; to be used with
+     * Publish And Subscribe
+     * @param aValue the new value
+     **/
+    virtual void HandlePropertyChangeL(
+        const TUid& aCategory,
+        const TUint aKey,
+        const TDesC8& aValue ) = 0;
+
+    /**
+     * This is a callback function which is called when a property value of
+     * type text is changed.
+     *
+     * @param aCategory UID of Publish And Subscribe category
+     * @param aKey subkey to specify the category event; to be used with
+     * Publish And Subscribe
+     * @param aValue the new value
+     **/
+    virtual void HandlePropertyChangeL(
+        const TUid& aCategory,
+        const TUint aKey,
+        const TDesC& aValue ) = 0;
+
+    /**
+     * This is a callback function which is called when a P&S components
+     * returns an error
+     *
+     * @param aCategory UID of Publish And Subscribe category
+     * @param aKey subkey to specify the category event
+     * @param aError an error code
+     */
+    virtual void HandlePropertyChangeErrorL(
+        const TUid& aCategory,
+        const TUint aKey,
+        TInt aError ) = 0;
+
+};
+
+
+/**
+ * Observer class that observes changes of Property values and propogates
+ * them further.
+ * The class defines a handle to a property, a single data value representing
+ * an item of state information.
+ *
+ */
+NONSHARABLE_CLASS( CRadioPropertyObserver ) : public CActive
+    {
+
+ public:
+
+    /**
+     * Property type. Cannot use RProperty::TType because EByteArray == EText.
+     */
+    enum TRadioPropertyType
+        {
+        ERadioPropertyInt, // Integral property type.
+        ERadioPropertyByteArray, // Byte-array ( 8 bit ), max size 512 bytes
+        ERadioPropertyText // Text ( 16 bit ), max size 512 bytes
+        };
+
+    /**
+     * Two-phased constructor.
+     *
+     * @param aObserver a reference to the observer interface implementer
+     * @param aCategory UID of Publish And Subscribe category
+     * @param aKey subkey to specify the category event; to be used with
+     * Publish And Subscribe
+     * @param aPropertyType property type to observe
+     */
+    IMPORT_C static CRadioPropertyObserver* NewL(
+        MRadioPropertyChangeObserver& aObserver,
+        const TUid& aCategory,
+        const TUint aKey,
+        const TRadioPropertyType aPropertyType );
+
+    ~CRadioPropertyObserver();
+
+    /**
+     * Subscribes the object to listen to the specified key. Does nothing if already active.
+     * Must be called after construction, or after calling Cancel().
+     */
+    IMPORT_C void ActivateL();
+
+    /**
+     * Returns current integer property value
+     *
+     * @return int value
+     */
+    IMPORT_C TInt ValueInt() const;
+
+    /**
+     * Returns current byte array property value
+     *
+     * @return byte array value
+     */
+    IMPORT_C const TDesC8& ValueDes8() const;
+
+    /**
+     * Returns current text property value
+     *
+     * @return text value
+     */
+    IMPORT_C const TDesC& ValueDes() const;
+
+private:
+
+    /**
+     * C++ default constructor overload.
+     * Two-phased constructor.
+     *
+     * @param aObserver a reference to the observer interface implementer
+     * @param aCategory UID of Publish And Subscribe category
+     * @param aKey subkey to specify the category event; to be used with
+     * Publish And Subscribe
+     * @param aPropertyType property type to observe
+     */
+    CRadioPropertyObserver(
+        MRadioPropertyChangeObserver& aObserver,
+        const TUid& aCategory,
+        const TUint aKey,
+        const TRadioPropertyType aPropertyType );
+
+    /**
+     * By default Symbian 2nd phase constructor is private.
+     **/
+    void ConstructL();
+
+protected:
+
+    // from base class Cactive
+    /**
+     * From CActive
+     *
+     * @see CActive::RunL()
+     */
+    void RunL();
+
+    /**
+     * From CActive,
+     *
+     * @see CActive::DoCancel()
+     */
+    void DoCancel();
+
+private: // data
+
+    /**
+     * Value of a subscribed category property of type int.
+     */
+    TInt                            iValueInt;
+
+    /**
+     * Value of a subscribed category property of type byte array.
+     */
+    HBufC8*                         iValueByteArray;
+
+    /**
+     * Value of a subscribed category property of type text.
+     */
+    HBufC*                          iValueText;
+
+    /**
+     * Handle to Publish And Subscribe component
+     */
+    RProperty                       iProperty;
+
+    /**
+     * Observer to be notified when particular Property value has changed
+     */
+    MRadioPropertyChangeObserver&   iObserver;
+
+    /**
+     * UID of Publish And Subscribe category
+     */
+    TUid                            iCategory;
+
+    /**
+     * Subkey to be used with Publish And Subscribe
+     */
+    TUint                           iKey;
+
+    /**
+     * Type of the observed property.
+     */
+    TRadioPropertyType              iPropertyType;
+
+    };
+
+#endif  // CRADIOPROPERTYOBSERVER_H
+