objectDB.h

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/*******************************************************************************
** Copyright (c) 2018 MAK Technologies, Inc.
** All rights reserved.
*******************************************************************************/



#pragma once

#include <vrfutil/vrfutilDefines.h>

#include <vlutil/vlFilename.h>

#include <matrix/vlVector.h>

#include <boost/optional.hpp>

#include <stdio.h>
#include <memory>

class DT_DLL_vrfutil DtObjectDB
   : public std::enable_shared_from_this<DtObjectDB>
{
public:
   typedef std::shared_ptr<DtObjectDB> Ptr;
   typedef DtU64 Offset;

   class Cursor;

   enum CreateFile    { DoNotCreate, Create };
   enum EraseExisting { DoNotErase, Erase };

   static Ptr Make(const DtFilename& filename);

   virtual ~DtObjectDB();

   virtual const DtFilename& filename() const;

   virtual std::unique_ptr<Cursor> makeCursor(CreateFile, EraseExisting);

protected:
   explicit DtObjectDB(const DtFilename& filename);

   const DtFilename myFilename;
};

class DT_DLL_vrfutil DtObjectDB::Cursor
{
public:
   virtual ~Cursor();

   virtual Offset currentOffset() const;

   virtual void setCurrentOffset(Offset offset);

   virtual bool eof() const;

   virtual bool error() const;

   virtual void flush();

   virtual bool readBool();
   virtual DtInt32 readInt32();
   virtual DtU32 readUInt32();
   virtual DtU64 readUInt64();
   virtual DtFloat64 readFloat64();
   virtual DtString readString();
   virtual DtVector readVector();

   virtual void writeBool(bool);
   virtual void writeInt32(DtInt32);
   virtual void writeUInt32(DtU32);
   virtual void writeUInt64(DtU64);
   virtual void writeFloat64(DtFloat64);
   virtual void writeString(const DtString&);
   virtual void writeVector(const DtVector&);

protected:
   friend class DtObjectDB;

   explicit Cursor(const DtObjectDB::Ptr& db, CreateFile, EraseExisting);

   DtObjectDB::Ptr myDB;
   FILE* myFile;
};