// Copyright (c) 2017 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef _StdStorage_BucketOfPersistent_HeaderFile
#define _StdStorage_BucketOfPersistent_HeaderFile

#include <Standard.hxx>
#include <Standard_Handle.hxx>
#include <Standard_Integer.hxx>

class StdStorage_BucketOfPersistent;
class StdStorage_BucketIterator;
class StdObjMgt_Persistent;

class StdStorage_Bucket 
{
  friend class StdStorage_BucketIterator;
  friend class StdStorage_BucketOfPersistent;

  StdObjMgt_Persistent** mySpace;
  Standard_Integer       mySpaceSize;
  Standard_Integer       myCurrentSpace;

  void Append(StdObjMgt_Persistent *);

  StdObjMgt_Persistent* Value(const Standard_Integer theIndex) const;

public:

  StdStorage_Bucket() : mySpace(0L), mySpaceSize(200000), myCurrentSpace(-1)
  {
    mySpace = (StdObjMgt_Persistent**)Standard::Allocate(sizeof(StdObjMgt_Persistent*) * mySpaceSize);
  }

  StdStorage_Bucket(const Standard_Integer theSpaceSize) : mySpace(0L), mySpaceSize(theSpaceSize), myCurrentSpace(-1)
  {
    mySpace = (StdObjMgt_Persistent**)Standard::Allocate(sizeof(StdObjMgt_Persistent*) * mySpaceSize);
  }

  void Clear();

  ~StdStorage_Bucket();
};

class StdStorage_BucketOfPersistent 
{
  friend class StdStorage_BucketIterator;
  StdStorage_Bucket** myBuckets;
  Standard_Integer    myNumberOfBucket;
  Standard_Integer    myNumberOfBucketAllocated;
  StdStorage_Bucket*  myCurrentBucket;
  Standard_Integer    myCurrentBucketNumber;
  Standard_Integer    myLength;
  Standard_Integer    myBucketSize;

public:
  StdStorage_BucketOfPersistent(const Standard_Integer theBucketSize = 300000, const Standard_Integer theBucketNumber = 100);

  Standard_Integer Length() const
  {
    return myLength;
  }

  void Append(const Handle(StdObjMgt_Persistent)& sp);

  StdObjMgt_Persistent* Value(const Standard_Integer theIndex);

  void Clear();

  ~StdStorage_BucketOfPersistent();
};

class StdStorage_BucketIterator 
{
  StdStorage_BucketOfPersistent *myBucket;
  StdStorage_Bucket             *myCurrentBucket;
  Standard_Integer               myCurrentBucketIndex;
  Standard_Integer               myCurrentIndex;
  Standard_Integer               myBucketNumber;
  Standard_Boolean               myMoreObject;

public:
  StdStorage_BucketIterator(StdStorage_BucketOfPersistent*);

  void Init(StdStorage_BucketOfPersistent*);
  void Reset();

  StdObjMgt_Persistent* Value() const
  {
    if (myCurrentBucket) {
      return myCurrentBucket->mySpace[myCurrentIndex];
    }
    else return 0L;
  }

  Standard_Boolean More() const
  {
    return myMoreObject;
  }

  void Next();
};

#endif // _StdStorage_BucketOfPersistent_HeaderFile