// Copyright (c) 1998-1999 Matra Datavision
// Copyright (c) 1999-2014 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 _Storage_BucketOfPersistent_HeaderFile
#define _Storage_BucketOfPersistent_HeaderFile

#include <Standard_Integer.hxx>
#include <Standard_Persistent.hxx>

class Storage_Schema;
class Storage_BucketOfPersistent;
class Storage_BucketIterator;

class Storage_Bucket {
  friend class Storage_BucketIterator;
  friend class Storage_Schema;
  friend class Storage_BucketOfPersistent;

  Standard_Persistent** mySpace;
  Standard_Integer mySpaceSize;
  Standard_Integer myCurrentSpace;


  void Append(Standard_Persistent *);
 
  Standard_Persistent* Value(const Standard_Integer theIndex) const;

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

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

  void Clear();

  ~Storage_Bucket();
};


class Storage_BucketOfPersistent {
  friend class Storage_BucketIterator;
  Storage_Bucket** myBuckets;
  Standard_Integer myNumberOfBucket;
  Standard_Integer myNumberOfBucketAllocated;
  Storage_Bucket*  myCurrentBucket;
  Standard_Integer myCurrentBucketNumber;
  Standard_Integer myLength;
  Standard_Integer myBucketSize;
  
public:
  Storage_BucketOfPersistent(const Standard_Integer theBucketSize = 300000, const Standard_Integer theBucketNumber = 100);
  
  Standard_Integer Length() const
    {
      return myLength;
    }

  void Append(const Handle(Standard_Persistent)& sp);
  
  Standard_Persistent* Value(const Standard_Integer theIndex);

  void Clear();

  ~Storage_BucketOfPersistent() ;

};

class Storage_BucketIterator {
  Storage_BucketOfPersistent *myBucket;
  Storage_Bucket             *myCurrentBucket;
  Standard_Integer            myCurrentBucketIndex;
  Standard_Integer            myCurrentIndex;
  Standard_Integer            myBucketNumber;
  Standard_Boolean            myMoreObject;

public:
  Storage_BucketIterator(Storage_BucketOfPersistent*);
  void Init(Storage_BucketOfPersistent*);
  void Reset();

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

  Standard_Boolean More() const
    {
      return myMoreObject;
    }

  void Next();
};

#endif