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// Copyright: 	Matra-Datavision 1991
// File:	PCollection_Vertex.gxx
// Created:	Wed May 29 17:04:56 1991
// Author:	Denis PASCAL
//		<dp>
// Revised by:  Mireille MERCIEN
//              Sep,7 1992

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


//---------------------------------------------------------------------------
// Constructor
//---------------------------------------------------------------------------
PCollection_Vertex::
     PCollection_Vertex (const Item& Value,
                        const Handle(PCollection_HDirectedGraph)& InGraph) 
{
  MyItem       = Value;
  MyGraph      = InGraph;
  MyFrontEdges = new PCollection_SetOfEdge;
  MyBackEdges  = new PCollection_SetOfEdge;
}

//---------------------------------------------------------------------------
// GetItem
//---------------------------------------------------------------------------
Item PCollection_Vertex::GetItem () const 
{
  return MyItem;
}

//---------------------------------------------------------------------------
// SetItem
//---------------------------------------------------------------------------
void PCollection_Vertex::SetItem (const Item& Value) 
{
  MyItem = Value;
}

//---------------------------------------------------------------------------
// GetGraph
//---------------------------------------------------------------------------
Handle(PCollection_HDirectedGraph) PCollection_Vertex::GetGraph () const 
{
  return MyGraph;
}

//---------------------------------------------------------------------------
// AddFrontEdge
//---------------------------------------------------------------------------
Boolean PCollection_Vertex::AddFrontEdge (const Handle(PCollection_Edge)& E) 
{
  if (MyFrontEdges->Contains(E)) {
    return False;
  }
  else {
    MyFrontEdges->Add(E);
    return True;
  }
}

//---------------------------------------------------------------------------
// RemoveFrontEdge
//---------------------------------------------------------------------------
void PCollection_Vertex::RemoveFrontEdge (const Handle(PCollection_Edge)& E) 
{
  if (MyFrontEdges->Contains(E)) {
    MyFrontEdges->Remove(E);
  }
  else {
    Standard_NoSuchObject::Raise();
  }
}
       
//---------------------------------------------------------------------------
// NbFrontEdges
//---------------------------------------------------------------------------
Integer PCollection_Vertex::NbFrontEdges () const 
{
  return MyFrontEdges->Extent();
}

//---------------------------------------------------------------------------
// GetFrontEdges
//---------------------------------------------------------------------------
Handle(PCollection_SetOfEdge) PCollection_Vertex::GetFrontEdges () const 
{
  return MyFrontEdges;
}

//---------------------------------------------------------------------------
// AddBackEdge
//---------------------------------------------------------------------------
Boolean PCollection_Vertex::AddBackEdge (const Handle(PCollection_Edge)& E) 
{
  if (MyBackEdges->Contains(E)) {
    return False;
  }
  else {
    MyBackEdges->Add(E);
    return True;
  }
}

//---------------------------------------------------------------------------
// RemoveBackEdge
//---------------------------------------------------------------------------
void PCollection_Vertex::RemoveBackEdge (const Handle(PCollection_Edge)& E) 
{
  if (MyBackEdges->Contains(E)) {
    MyBackEdges->Remove(E);
  }
  else {
     Standard_NoSuchObject::Raise();
  }
}

//---------------------------------------------------------------------------
// NbBackEdges
//---------------------------------------------------------------------------
Integer PCollection_Vertex::NbBackEdges () const 
{
  return MyBackEdges->Extent();
}

//---------------------------------------------------------------------------
// GetBackEdges
//---------------------------------------------------------------------------
Handle(PCollection_SetOfEdge) PCollection_Vertex::GetBackEdges () const 
{
  return MyBackEdges;
}

//---------------------------------------------------------------------------
// IsRoot
//---------------------------------------------------------------------------
Boolean PCollection_Vertex::IsRoot () const 
{
  return (NbBackEdges() == 0);
}   

//---------------------------------------------------------------------------
// IsLeaf
//---------------------------------------------------------------------------
Boolean PCollection_Vertex::IsLeaf () const 
{
  return (NbFrontEdges() == 0);
}

//---------------------------------------------------------------------------
// IsDestination
//---------------------------------------------------------------------------
Boolean PCollection_Vertex::
    IsDestination (const Handle(PCollection_Vertex)& V) const 
{
  PCollection_SetIteratorOfSetOfEdge It(MyBackEdges);
  while (It.More()) {
    Handle(PCollection_Edge) E = It.Value();
    if (E->Source() == V) return True;
    It.Next();
  }
  return False;
}

//---------------------------------------------------------------------------
// IsSource
//---------------------------------------------------------------------------
Boolean PCollection_Vertex::
         IsSource (const Handle(PCollection_Vertex)& V) const 
{
  PCollection_SetIteratorOfSetOfEdge It(MyFrontEdges);
  while (It.More()) {
    Handle(PCollection_Edge) E = It.Value();
    if ( E->Destination() == V) return True;
    It.Next();
  }
  return False;
}