// Created on: 2007-05-29
// Created by: Vlad Romashko
// Copyright (c) 2007-2014 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 _TDataStd_ByteArray_HeaderFile
#define _TDataStd_ByteArray_HeaderFile

#include <Standard.hxx>
#include <Standard_Type.hxx>

#include <TColStd_HArray1OfByte.hxx>
#include <Standard_Boolean.hxx>
#include <TDF_Attribute.hxx>
#include <Standard_Integer.hxx>
#include <Standard_Byte.hxx>
#include <Standard_OStream.hxx>
class TDataStd_DeltaOnModificationOfByteArray;
class Standard_GUID;
class TDF_Label;
class TDF_Attribute;
class TDF_RelocationTable;
class TDF_DeltaOnModification;


class TDataStd_ByteArray;
DEFINE_STANDARD_HANDLE(TDataStd_ByteArray, TDF_Attribute)

//! An array of Byte (unsigned char) values.
class TDataStd_ByteArray : public TDF_Attribute
{
  friend class TDataStd_DeltaOnModificationOfByteArray;
  DEFINE_STANDARD_RTTIEXT(TDataStd_ByteArray, TDF_Attribute)
public:

  //! Static methods
  //! ==============
  //! Returns an ID for array.
  Standard_EXPORT static const Standard_GUID& GetID();
  
  //! Finds or creates an attribute with the array on the specified label.
  //! If <isDelta> == False, DefaultDeltaOnModification is used.
  //! If <isDelta> == True, DeltaOnModification of the current attribute is used.
  //! If attribute is already set, all input parameters are refused and the found
  //! attribute is returned.
  Standard_EXPORT static Handle(TDataStd_ByteArray) Set (const TDF_Label& label, const Standard_Integer lower, const Standard_Integer upper, const Standard_Boolean isDelta = Standard_False);
  
  //! Initialize the inner array with bounds from <lower> to <upper>
  Standard_EXPORT void Init (const Standard_Integer lower, const Standard_Integer upper);
  
  //! Sets the <Index>th element of the array to <Value>
  //! OutOfRange exception is raised if <Index> doesn't respect Lower and Upper bounds of the internal  array.
  Standard_EXPORT void SetValue (const Standard_Integer index, const Standard_Byte value);
  
  //! Return the value of the <Index>th element of the array.
  Standard_EXPORT Standard_Byte Value (const Standard_Integer Index) const;
Standard_Byte operator () (const Standard_Integer Index) const
{
  return Value(Index);
}
  
  //! Returns the lower boundary of the array.
  Standard_EXPORT Standard_Integer Lower() const;
  
  //! Returns the upper boundary of the array.
  Standard_EXPORT Standard_Integer Upper() const;
  
  //! Returns the number of elements in the array.
  Standard_EXPORT Standard_Integer Length() const;

  const Handle(TColStd_HArray1OfByte)& InternalArray() const { return myValue; }

  //! Sets the inner array <myValue>  of the attribute to
  //! <newArray>. If value of <newArray> differs from <myValue>, Backup performed
  //! and myValue refers to new instance of HArray1OfInteger that holds <newArray>
  //! values.
  //! If <isCheckItems> equal True each item of <newArray> will be checked with each
  //! item of <myValue> for coincidence (to avoid backup).
  Standard_EXPORT void ChangeArray (const Handle(TColStd_HArray1OfByte)& newArray, const Standard_Boolean isCheckItems = Standard_True);

  Standard_Boolean GetDelta() const { return myIsDelta; }

  //! for internal  use  only!
  void SetDelta (const Standard_Boolean isDelta) { myIsDelta = isDelta; }

  Standard_EXPORT TDataStd_ByteArray();
  
  Standard_EXPORT const Standard_GUID& ID() const Standard_OVERRIDE;
  
  Standard_EXPORT void Restore (const Handle(TDF_Attribute)& with) Standard_OVERRIDE;
  
  Standard_EXPORT Handle(TDF_Attribute) NewEmpty() const Standard_OVERRIDE;
  
  Standard_EXPORT void Paste (const Handle(TDF_Attribute)& into, const Handle(TDF_RelocationTable)& RT) const Standard_OVERRIDE;
  
  Standard_EXPORT virtual Standard_OStream& Dump (Standard_OStream& OS) const Standard_OVERRIDE;
  
  //! Makes a DeltaOnModification between <me> and
  //! <anOldAttribute>.
  Standard_EXPORT virtual Handle(TDF_DeltaOnModification) DeltaOnModification (const Handle(TDF_Attribute)& anOldAttribute) const Standard_OVERRIDE;

private:

  void RemoveArray() { myValue.Nullify(); }
  
private:

  Handle(TColStd_HArray1OfByte) myValue;
  Standard_Boolean myIsDelta;

};

#endif // _TDataStd_ByteArray_HeaderFile