/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkBridgeCellIteratorOnDataSet.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
// .NAME vtkBridgeCellIteratorOnDataSet - Iterate over cells of a dataset.
// .SECTION See Also
// vtkBridgeCellIterator, vtkBridgeDataSet, vtkBridgeCellIteratorStrategy

#include "vtkBridgeCellIteratorOnDataSet.h"

#include <assert.h>

#include "vtkObjectFactory.h"
#include "vtkBridgeCell.h"
#include "vtkBridgeDataSet.h"
#include "vtkDataSet.h"
#include "vtkCell.h"

vtkStandardNewMacro(vtkBridgeCellIteratorOnDataSet);

//-----------------------------------------------------------------------------
void vtkBridgeCellIteratorOnDataSet::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);
}

//-----------------------------------------------------------------------------
vtkBridgeCellIteratorOnDataSet::vtkBridgeCellIteratorOnDataSet()
{
  this->DataSet=0;
  this->Cell=vtkBridgeCell::New();
  this->Id=0;
  this->Size=0;
//  this->DebugOn();
}

//-----------------------------------------------------------------------------
vtkBridgeCellIteratorOnDataSet::~vtkBridgeCellIteratorOnDataSet()
{
  if(this->DataSet!=0)
    {
    this->DataSet->Delete();
    this->DataSet=0;
    }
  this->Cell->Delete();
  this->Cell=0;
}

//-----------------------------------------------------------------------------
// Description:
// Move iterator to first position if any (loop initialization).
void vtkBridgeCellIteratorOnDataSet::Begin()
{
  this->Id=-1;
  this->Next(); // skip cells of other dimensions
}

//-----------------------------------------------------------------------------
// Description:
// Is there no cell at iterator position? (exit condition).
int vtkBridgeCellIteratorOnDataSet::IsAtEnd()
{
  return (this->Id>=this->Size);
}

//-----------------------------------------------------------------------------
// Description:
// Cell at current position
// \pre not_at_end: !IsAtEnd()
// \pre c_exists: c!=0
// THREAD SAFE
void vtkBridgeCellIteratorOnDataSet::GetCell(vtkGenericAdaptorCell *c)
{
  assert("pre: not_at_end" && !IsAtEnd());
  assert("pre: c_exists" && c!=0);
  
  vtkBridgeCell *c2=static_cast<vtkBridgeCell *>(c); 
  c2->Init(this->DataSet,this->Id);
}
  
//-----------------------------------------------------------------------------
// Description:
// Cell at current position.
// NOT THREAD SAFE
// \pre not_at_end: !IsAtEnd()
// \post result_exits: result!=0
vtkGenericAdaptorCell *vtkBridgeCellIteratorOnDataSet::GetCell()
{
  assert("pre: not_at_end" && !IsAtEnd());
  
  this->Cell->Init(this->DataSet,this->Id);
  vtkGenericAdaptorCell *result=this->Cell;
  
  assert("post: result_exits" && result!=0);
  return result;
}

//-----------------------------------------------------------------------------
// Description:
// Move iterator to next position. (loop progression).
// \pre not_at_end: !IsAtEnd()
void vtkBridgeCellIteratorOnDataSet::Next()
{
  assert("pre: not_off" && !IsAtEnd());
  
  vtkIdType size=this->Size;
  vtkCell *c;
  int found;
  
  this->Id++;
  
  if(this->Dim>=0) // skip cells of other dimensions than this->Dim
    {
    found=0;
    while( (this->Id<size) && (!found) )
      {
      c=this->DataSet->Implementation->GetCell(this->Id);
      found=c->GetCellDimension()==this->Dim;
      this->Id++;
      }
    if(found)
      {
      this->Id--;
      }
    }
}

//-----------------------------------------------------------------------------
// Description:
// Used internally by vtkBridgeDataSet.
// Iterate over cells of `ds' of some dimension `dim'.
// \pre ds_exists: ds!=0
// \pre valid_dim_range: (dim>=-1) && (dim<=3)
void vtkBridgeCellIteratorOnDataSet::InitWithDataSet(vtkBridgeDataSet *ds,
                                                     int dim)
{
  assert("pre: ds_exists" && ds!=0);
  assert("pre: valid_dim_range" && (dim>=-1) && (dim<=3));
  
  this->Dim=dim;
  vtkSetObjectBodyMacro(DataSet,vtkBridgeDataSet,ds);
  this->Size=ds->GetNumberOfCells();
  this->Id=this->Size; // at end
}
