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// File:	GraphTools_DFSIterator.gxx
// Created:	Mon Oct 12 16:34:15 1992
// Author:	Denis PASCAL
//		<dp@bravox>

#include <Standard_NoMoreObject.hxx>
#include <Standard_NoSuchObject.hxx>
#include <TColStd_StackOfInteger.hxx>

//=======================================================================
//function : GraphTools_DFSIterator
//purpose  : 
//=======================================================================

GraphTools_DFSIterator::GraphTools_DFSIterator () {}


//=======================================================================
//function : Perform
//purpose  : 
//=======================================================================

void GraphTools_DFSIterator::Perform
  (const Graph& G, const Vertex& V)
{  
  Standard_Integer index;
  myVisited.Clear();
  TColStd_StackOfInteger myReady;
 
  index = myVisited.Add(V);
  myReady.Push(index);
  while (!myReady.IsEmpty()) {
    Vertex w1 = myVisited (myReady.Top());
    myReady.Pop();
    for (VIterator it(G,w1); it.More(); it.Next()) {
      Vertex w2 = it.Value();      
      if (!myVisited.Contains(w2)) {
	index = myVisited.Add(w2); 
	myReady.Push(index);
      }
    }
  }
  myCurrentIndex = 1;
}


//=======================================================================
//function : More
//purpose  : 
//=======================================================================

Standard_Boolean GraphTools_DFSIterator::More () const 
{
  return myCurrentIndex <= myVisited.Extent();
}


//=======================================================================
//function : Next
//purpose  : 
//=======================================================================

void GraphTools_DFSIterator::Next () 
{
  myCurrentIndex++;
}


//=======================================================================
//function : Value
//purpose  : 
//=======================================================================

const Vertex& GraphTools_DFSIterator::Value () const 
{
  return myVisited(myCurrentIndex);
}