diff -r 000000000000 -r 2e3d3ce01487 tzpcside/tzcompiler/Include/PersistedEntityWrapper.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tzpcside/tzcompiler/Include/PersistedEntityWrapper.h	Tue Feb 02 10:12:00 2010 +0200
@@ -0,0 +1,81 @@
+// Copyright (c) 2004-2009 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:
+// DST TZ Database Compiler 
+// 
+//
+
+#ifndef __PERSISTED_ENTITY_WRAPPER_H
+#define __PERSISTED_ENTITY_WRAPPER_H
+
+#include <windows.h>
+#include <iostream>
+#include <fstream>
+#include "..\..\tz\Server\Include\tzpersisted.h"
+
+//============================================================================
+// Forward Declarations
+//============================================================================
+class CTZDocument;
+//============================================================================
+// CPersistedEntityWrapper class definition
+// Abstract base wrapper class for all the entities.  
+// Each specialised wrapper class will be responsible for the behaviour of a 
+// persisted entity.
+//============================================================================
+class CPersistedEntityWrapper
+	{
+public:
+	CPersistedEntityWrapper(CTZDocument& aDocument);
+	virtual ~CPersistedEntityWrapper();
+
+	virtual void ExternaliseL(std::ofstream& aFilestream)=0;
+
+	// When a derived class is destroyed, call this on each referenced entity.
+	virtual void DecrRefCount() { --iReferenceCount; }
+	virtual void IncrRefCount() { ++iReferenceCount; }
+	virtual bool IsUnreferenced() { return iReferenceCount==0; } 
+	virtual TUint16 ReferenceCount() { return iReferenceCount; }
+
+	int iOffset;				//Reference to the entity in the database
+
+protected:
+	CTZDocument& iDocument;
+	
+private:
+	TUint16 iReferenceCount;		//Number of objects referencing this entity
+								//If this remains 0 after assembly then 
+								//this entity will not be persisted.
+	};
+
+//============================================================================
+// SEntityCheck
+// Used to remove unreferenced entities from the entity tables
+//============================================================================
+struct SEntityCheck
+	{
+	TBool operator()(CPersistedEntityWrapper* aEntity)
+		{
+		bool remove = aEntity->IsUnreferenced();
+		if (remove)
+			{
+			delete aEntity;
+			}
+		return remove;
+		}
+	};
+
+#endif //__PERSISTED_ENTITY_WRAPPER_H
+//============================================================================
+// End of file
+//============================================================================