VOSCursor.h

//========================================================================================
// 
// $File$
// 
// Owner: EricM
// 
// $Author$
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// $DateTime$
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// Copyright 1997-2010 Adobe Systems Incorporated. All rights reserved.
// 
// NOTICE: Adobe permits you to use, modify, and distribute this file in accordance 
// with the terms of the Adobe license agreement accompanying it. If you have received
// this file from a source other than Adobe, then your use, modification, or 
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//========================================================================================

#ifndef __VOSCURSOR__
#define __VOSCURSOR__

#include "VOSSimpleCursor.h"

class IVOSCache;
class IVOSDiskPage;


class VOS_Cursor : public VOS_SimpleCursor
{
 public:
 VOS_Cursor(IVOSCache* cache);
 VOS_Cursor(IVOSCache* cache, IVOSDiskPage* block, int32 offset);
 VOS_Cursor(const VOS_SimpleCursor& cursor);
 ~VOS_Cursor();

 VOS_Cursor GetPrevious(bool16 *found = nil) const;

 VOS_Cursor GetNext(bool16 *found = nil) const;

 void AppendAfter(VOS_Object *object, bool16 duplicate = kTrue);

 void AppendAfterAndMove(VOS_Object *object, bool16 duplicate = kTrue);

 void InsertBefore(VOS_Object *object, bool16 duplicate = kTrue);

 void ReplaceObjectWith(VOS_Object *obj, bool16 duplicate = kTrue);

#ifdef DEBUG
 private:
 // In a multi-threaded environment these stats may not be updated accurately.
 // Atomic add and subtracts of these stats are required in order to have accurate values. 
 // This would put a great overhead on the performance. Hence, we are not using atomic add and
 // subtract expecting that these stats need not be accurate.
 static int32 ts_Count;
#endif

 private:

 UID GetFirstPageOfStrand();

};



#endif // __VOSCURSOR__