diff -r 000000000000 -r e6b17d312c8b imservices/imfeatureplugin/srcimdatamodel/imdatacacheimp.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/imservices/imfeatureplugin/srcimdatamodel/imdatacacheimp.h	Thu Dec 17 08:54:49 2009 +0200
@@ -0,0 +1,142 @@
+/*
+* 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:  IM data cache implementation.
+*
+*/
+
+#ifndef CIMDATACACHEIMP_H
+#define CIMDATACACHEIMP_H
+
+#include "ximpapiobjbase.h"
+#include "imapiobjbase.h"
+//#include "ximpitemparent.h"
+#include "ximpimitemparent.h"
+#include "imtypehelpers.h"
+//#include "ximpoperationdefs.h"
+#include "ximpapieventbase.h"
+
+class MXIMPHost;
+class CConversationSubscriptionItem;
+class CXIMPIdentityImp;
+class MXIMPPscContext;
+class CXIMPIMSubscriptionItemBase;
+class MXIMPStatus;
+class MXIMPIdentity;
+class MXIMPDataSubscriptionState;
+class CXIMPDataSubscriptionStateImp;
+
+
+/**
+ * PSC Im Data Cache implementation.
+ *
+ * @since S60 v3.2
+ */
+class CImDataCache : public CBase,
+                           public MXIMPIMItemParent
+    {
+public: // Definitions
+
+    /** The class ID. */
+    enum { KClassId = IMIMP_CLSID_CIMDATACACHE };
+
+
+public: // Construction and destruction
+
+    /**
+     * Construction
+     */
+    IMPORT_C static CImDataCache* NewL( MXIMPHost& aHost );
+
+    /**
+     * Destruction
+     */
+    virtual ~CImDataCache();
+
+private:
+
+    CImDataCache( MXIMPHost& aHost );
+    void ConstructL();
+    
+private:   // MXIMPIMItemParentBase
+
+	TAny* GetInterface(TInt aInterfaceId);
+    // Expiring items
+    void RegisterExpiringItemL( CXIMPSubscriptionItemBase* aExpireItem );
+    void UnregisterExpiringItem( CXIMPSubscriptionItemBase* aExpireItem );
+    
+private: // From MXIMPIMItemParent
+
+    /**
+     * @see MXIMPIMItemParent
+     */
+    void RemoveMe( CConversationSubscriptionItem* aChild );
+
+    // Other methods
+    void AddEventL( CXIMPApiEventBase& aEvent, MXIMPPscContext* aContext );
+
+public: // New methods
+
+    /**
+     * - If CConversationSubscriptionItem is not found, data cache
+     *   initializes new one and returns ownership to caller
+     * - If CConversationSubscriptionItem is found, data cache increases
+     *   refcount by one, and returns the old object
+     */
+	IMPORT_C CConversationSubscriptionItem& ConversationSubscriptionItemLC();
+    /**
+     * Clean resources concerning context.
+     */
+    IMPORT_C void CleanResources( MXIMPPscContext& aContext );
+
+    /**
+     *
+     */
+    IMPORT_C void CleanExpired();
+    
+private: // Helper methods
+
+    /**
+     * Template method for removeMe when one subscription item is target.
+     * @param aItem Reference to subscription item pointer to remove.
+     * @param Pointer of item to remove.
+     */
+    template< class Type >
+    IMPORT_C static void RemoveMe( Type*& aItem, Type* aChild );
+
+    
+    /**
+     * Templated item instance creation. If item is not found it is created.
+     * @param aItem Reference to pointer where new item should be saved.
+     * @return Reference to item created.
+     */
+    template< class Type > 
+    Type& ItemLC( Type*& aItem );
+
+   
+    
+private: // Data
+
+    /**
+     * Access to host.
+     */
+    MXIMPHost& iHost;
+
+    /**
+     * Does not own. Removed when RemoveMe called.
+     */
+ 	CConversationSubscriptionItem* iConversationSubscriptionItem;
+ 
+    };
+
+#endif // CIMDATACACHEIMP_H