--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/natplugins/natpnatfwsdpprovider/inc/nspnatfwasyncstate.h	Tue Feb 02 01:04:58 2010 +0200
@@ -0,0 +1,162 @@
+/*
+* Copyright (c) 2007 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:  Stream component async state class description.
+*
+*/
+
+#ifndef NSPNATFWASYNCSTATE_H
+#define NSPNATFWASYNCSTATE_H
+
+#include <e32base.h>
+
+/**
+ *  NAT FW stream state.
+ *
+ *  Class objects depict an async state of NAT FW stream, stream component
+ *  stores/changes the state whenever it makes async call to NAT FW.
+ *
+ *  @lib natfwsdpprovider.dll
+ *  @since S60 3.2
+ */
+class CNSPNATFWAsyncState : public CBase
+    {
+public: // Enums
+
+    /**
+     * External events that can change the state of this object.
+     */
+    enum TNATFWEvent
+        {
+        ENATFWEventFetchCand,
+        ENATFWEventPerformChecks,
+        ENATFWEventRecvAct,
+        ENATFWEventSendAct,
+        ENATFWEventRecvDeAct,
+        ENATFWEventSendDeAct
+        };
+
+private: // Enums
+
+    /**
+     * Internal state of this object.
+     */
+    enum TNATFWAsyncState
+        {
+        ENATFWIdle,
+        ENATFWFetchCand,
+        ENATFWCandChecks,
+        ENATFWSend,
+        ENATFWRecv,
+        ENATFWSendRecv
+        };    
+
+public: // Constructors and destructor
+    
+    /**
+     * A two-phase constructor.
+     */
+    static CNSPNATFWAsyncState* NewL();
+
+    /**
+     * A two-phase constructor.
+     */
+    static CNSPNATFWAsyncState* NewLC();
+
+    /**
+     * Copy constructor.
+     */
+    static CNSPNATFWAsyncState* NewL(
+                const CNSPNATFWAsyncState& aState );
+    
+    /**
+     * Copy constructor.
+     */
+    static CNSPNATFWAsyncState* NewLC(
+                const CNSPNATFWAsyncState& aState );
+
+    /**
+     * Destructor.
+     */
+    virtual ~CNSPNATFWAsyncState();
+    
+
+private: // Constructors and destructor
+
+    CNSPNATFWAsyncState();
+    
+    void Construct( const CNSPNATFWAsyncState& aState );
+
+
+public: // New functions
+
+    /**
+     * This method is used to check if given event can be processed.
+     *
+     * @since       S60 3.2
+     * @param       aEvent              Enumeration, external event.
+     * @return      System wide error code.
+     */
+    TInt CheckState( TNATFWEvent aEvent ) const;
+    
+    /**
+     * This method is used to check if given event can be processed.
+     * Leave occurs if processing is not allowed.
+     *
+     * @since       S60 3.2
+     * @param       aEvent              External event.
+     */
+    void CheckStateL( TNATFWEvent aEvent ) const;
+
+    /**
+     * This method is used to change to state. Use CheckState(L) 
+     * method to first verify that event is acceptable. 
+     *
+     * @since       S60 3.2
+     * @param       aEvent              External event.
+     * @return      System wide error code.
+     */
+    TInt ChangeState( TNATFWEvent aEvent );
+
+    /**
+     * This method is used to change to state. Use CheckState(L) 
+     * method to first verify that event is acceptable. 
+     *
+     * @since       S60 3.2
+     * @param       aEvent              External event.
+     */
+    void ChangeStateL( TNATFWEvent aEvent );
+    
+    /**
+     * This method is used to change to state, from async states
+     * to idle, depending on current state.
+     *
+     * @since       S60 3.2
+     * @return      ETrue if session state processing can continue.
+     */
+    TBool Continue();
+    
+
+private: // data
+
+    /**
+     * Current stream state is preserved.
+     */
+    TNATFWAsyncState iCurrentState;
+    
+    };
+
+#endif // NSPNATFWASYNCSTATE_H
+
+
+// end of file