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// Copyright (c) 2006-2010 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#ifndef __SQLSRVOBJCONTAINER_H__
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#define __SQLSRVOBJCONTAINER_H__
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#include <e32std.h>
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#include "SqlAssert.h"
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/**
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Indexed storage for server sdide objects.
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RDbObjContainer container is used for storing IPC stream handles (HIpcStream) and
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statement handles (CSqlSrvStatement).
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Behaviour when the container is destroyed:
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- all objects inside the container are destroyed too;
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Behaviour when the an object is removed from the container:
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- the container will destroy the object;
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Behaviour when the an object is added to the container:
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- the container stores the object <by_ref>, not <by_val>;
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Behaviour when a look up is performed in the container for an object:
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- a pointer to the object is returned or NULL if there is no object;
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@see CSqlSrvStatement
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@see HIpcStream
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@see RDbObjContainer::Close()
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@see RDbObjContainer::AllocL()
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@see RDbObjContainer::Add()
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@see RDbObjContainer::Remove()
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@see RDbObjContainer::Find()
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@see RDbObjContainer::Count()
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@internalComponent
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*/
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template <class T> class RDbObjContainer
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{
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public:
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RDbObjContainer();
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void Close();
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void AllocL();
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TInt Add(T* aObj);
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void Remove(TInt aHandle);
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T* Find(TInt aHandle) const;
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TInt Count() const;
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private:
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TInt MakeHandle(TInt aIndex) const;
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TInt MakeIndex(TInt aHandle) const;
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private:
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struct TEntry
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{
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T* iObj;
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TInt iNext;
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};
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enum {KGranularity = 16};
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//KMaxSize value depends on how many bits are used for handles - see
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//KStmtHandleMask and KStreamHandleMask in SqlUtil.h file.
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enum {KMaxSize = 0x7FF};
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TEntry* iEntries;
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TInt iSize;
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TInt iFree;
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};
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#include "SqlSrvObjContainer.inl"
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#endif//__SQLSRVOBJCONTAINER_H__
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