diff -r 000000000000 -r 72b543305e3a email/imap4mtm/imapsession/inc/cimapatomwalker.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/email/imap4mtm/imapsession/inc/cimapatomwalker.h	Thu Dec 17 08:44:11 2009 +0200
@@ -0,0 +1,68 @@
+// Copyright (c) 2006-2009 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 __CIMAPATOMWALKER_H__
+#define __CIMAPATOMWALKER_H__
+
+#include <e32base.h>
+
+class CImapAtom;
+
+/**
+Navigates a tree of CImapAtom objects, by storing the current atom together 
+with an atom stack that makes it possible to track the current atom's parent.
+
+Methods are provided to "Walk" the atom tree - updating the current atom,
+and to "Peek" the tree without updating the current atom.
+*/
+class CImapAtomWalker : public CBase
+	{
+public:
+	static CImapAtomWalker* NewL(TInt aLogId);
+	~CImapAtomWalker();
+
+	void SetRootL(CImapAtom* aRootAtom);
+	
+	void WalkDownL();
+	CImapAtom* WalkAcrossL(TBool aLeaveIfNull);
+	void WalkUpL();
+		
+	CImapAtom* PeekDown() const;	
+	CImapAtom* PeekAcross() const;
+	
+	TBool CurrentMatch(const TDesC8& aValue) const;
+	
+	const TDesC8& CurrentDes(TBool aNString) const;	
+	CImapAtom* Current() const;
+	
+	TInt StackCount() const;
+	
+	enum TAtomType
+		{
+		EAtomNil, // atom matches "NIL": This corresponds to the nil component in section 9 of RFC3501.
+		EAtomOpen, // atom matches "(": This atom has a child.
+		};		
+	TAtomType WalkAcrossToNilOrOpenL();
+	
+private:
+	CImapAtomWalker(TInt aLogId);
+	
+private:
+	CImapAtom* iCurrentAtom;	// not owned
+	RPointerArray<CImapAtom> iAtomStack; // does not own the objects it points at
+	TInt iLogId;
+	};
+
+#endif // __CIMAPATOMWALKER_H__