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// Copyright: 	Matra-Datavision 1991
// File:	PCollection_BreadthFirstIterator.gxx
// Created:	Wed May 29 17:43:06 1991
// Author:	Denis PASCAL
//		<dp>
// Revised by:  Mireille MERCIEN
//              Sep,7 1992

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


//---------------------------------------------------------------------------
// Constructor
//---------------------------------------------------------------------------
PCollection_BreadthFirstIterator::
      PCollection_BreadthFirstIterator (const Handle(PCollection_Vertex)& V) 
{
  Visited = new PCollection_SetOfVertex;
  Ready = new PCollection_QueueOfVertex;
  Visited->Add(V);
//mip  Ready->Add(V);
  Ready->Push(V);  
  HasMore = !(Ready->IsEmpty());
}


//---------------------------------------------------------------------------
// More
//---------------------------------------------------------------------------
Boolean PCollection_BreadthFirstIterator::More () const 
{
  return HasMore;
}


//---------------------------------------------------------------------------
// Next
//---------------------------------------------------------------------------
void PCollection_BreadthFirstIterator::Next () 
{
  if (!HasMore) Standard_NoMoreObject::Raise();
  Handle(PCollection_Vertex) w1 = Ready->Front();
  Ready->Pop();
  PCollection_FrontEdgesIterator It(w1);
  while (It.More()) {
    Handle(PCollection_Vertex) w2 = It.Value()->Destination();
    if (! (Visited->Contains(w2))) {
//mip       Ready->Add(w2);
       Ready->Push(w2);
       Visited->Add(w2);
    }
    It.Next();
  }
  HasMore = !(Ready->IsEmpty());
}

//---------------------------------------------------------------------------
// Value
//---------------------------------------------------------------------------
Handle(PCollection_Vertex) PCollection_BreadthFirstIterator::Value () const 
{
  if (!HasMore) Standard_NoSuchObject::Raise();
  return Ready->Front();
}

//---------------------------------------------------------------------------
// Clear
//---------------------------------------------------------------------------
void PCollection_BreadthFirstIterator::Clear () 
{
  HasMore = False;
}