diff -r 000000000000 -r ba25891c3a9e ncdengine/provider/storage/inc/ncddatabasestorage.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ncdengine/provider/storage/inc/ncddatabasestorage.h	Thu Dec 17 08:51:10 2009 +0200
@@ -0,0 +1,139 @@
+/*
+* Copyright (c) 2006-2008 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 M_NCDDATABASESTORAGE_H
+#define M_NCDDATABASESTORAGE_H
+
+
+#include <e32base.h>
+#include <d32dbms.h>
+
+
+class MNcdDatabaseStorage;
+class MNcdStorageItem;
+class RNcdDatabaseItems;
+
+/**
+ * Interface for database storages
+ * @ Improve comments
+ */
+
+class MNcdDatabaseStorage
+{
+public:
+
+    /**
+     * Database size information
+     */
+    typedef RDbDatabase::TSize TNcdDatabaseSize;
+        
+public: 
+
+
+    /**
+     * Returns ponter to storage item. If storage item doesn't exist
+     * it is created. Ownerhip of the storage item is not transferred
+     * to caller.
+     */
+    virtual MNcdStorageItem* StorageItemL( const TDesC& aUid, TInt aType ) = 0;
+
+    /**
+     * Gets all storage items from storage. This method doens't create
+     * new items to storage but returns all items being currently stored
+     * to it.
+     *
+     * @param aItems An array where to storage items will be added.
+     */
+    virtual void StorageItemsL( RPointerArray<MNcdStorageItem>& aItems ) = 0;
+    
+    
+    virtual void RemoveItemsL( 
+        const RArray<RNcdDatabaseItems>& aDoNotRemoveItems ) = 0;
+        
+
+    /**
+     * Begins transaction into storage.
+     */
+    virtual void Begin() = 0;
+
+    /**
+     * Commits changes to storage.
+     */
+    virtual void CommitL() = 0;
+
+    /**
+     * Discards changes and restores storage to state it was before
+     * transaction was started.
+     */
+    virtual void Rollback() = 0;
+
+    /**
+     * Ensures that given storage item exists in storage.
+     *
+     * NOTE: It is possible that storage item is created and exists
+     * but it is not stored to storage.
+     *
+     * @param aStorageItem The item to be checked
+     * @return Boolean value indicating whether the item exsists in
+     * storage.
+     */
+    virtual TBool ItemExistsInStorageL( MNcdStorageItem& aStorageItem ) = 0;
+
+    /**
+     * Ensures that given storage item exists in storage.
+     *
+     * NOTE: It is possible that storage item is created and exists
+     * but it is not stored to storage.
+     *
+     * @param aUid Uid of the item to be checked
+     * @param aType Type of the item to be checked
+     * @return Boolean value indicating whether the item exsists in
+     * storage.
+     */
+    virtual TBool ItemExistsInStorageL( const TDesC& aUid, TInt aType ) = 0;
+
+
+    /**
+     * Storage UID getter
+     * @return Storage UID
+     */
+    virtual const TDesC& Uid() const = 0;
+    
+    
+    /**
+     * Database size getter
+     */
+    virtual TNcdDatabaseSize Size() const = 0;
+    
+    
+    /**
+     * Commits and compacts the db
+     */
+    virtual void Compact() = 0;
+    
+protected:
+    
+    virtual ~MNcdDatabaseStorage()
+        {
+        }
+    
+
+};
+
+
+#endif // M_NCDDATABASESTORAGE_H