attributeHistory.h

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/***************************************************************************
** Copyright (c) 1992-2010 VT MAK
** All rights reserved.
***************************************************************************/


#pragma once



#include <list>

#include <lgrOmtReader/omtReader.h>
class DtDatatypeFedNode;
class DtStringTree;
class DtObjectHistory;
class DtDatatypeManager;

struct SingleAttribute
{
   int myByteStreamCount;
   int myStringTreeCount; //This value should be the same as byte stream
   void* myByteStream;
   DtStringTree* myStrTree;

   virtual ~SingleAttribute();

};
typedef std::list<SingleAttribute*> DtSingleAttributePtrList;

//Helper class that contains attribute information
class DT_DLL_OMTREADER DtAttributeHistory
{
public:

   DtAttributeHistory(DtDatatypeManager& dm);

   virtual ~DtAttributeHistory();


   virtual void* getByteStream(int lookback = 0);
   virtual void setByteStream(const void* buffer, int length);


   virtual void setParentObject(DtObjectHistory*);
   virtual DtObjectHistory* parentObject();

   virtual DtStringTree* createStringTree(const DtDatatypeFedNode* omtNode,
      int lookback = 0);

   virtual int getStringTreeCount(int lookback = 0);

   virtual int getByteStreamCount(int lookback = 0);

   virtual bool updatedFlag() const;

   virtual void resetUpdateFlag();

protected:
   virtual SingleAttribute* at(unsigned int index) const;

public: //Breaking code convention if this class gets complicated, undo this

protected: 
   DtSingleAttributePtrList myHistory;
   DtObjectHistory* myObject;
   DtDatatypeManager& myDatatypeManager;
   bool myUpdatedFlag;
};