// Copyright: 	Matra-Datavision 1991
// File:	PCollection_Edge.gxx
// Created:	Thu May 30 10:40:42 1991
// Author:	Denis PASCAL
//		<dp>
// Revised by:  Mireille MERCIEN
//              Sep,7 1992

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

//---------------------------------------------------------------------------
// Constructor
//---------------------------------------------------------------------------
PCollection_Edge::
     PCollection_Edge(const Handle(PCollection_Vertex)& Source, 
                     const Handle(PCollection_Vertex)& Destination, 
                     const Attribute& Value) 
{
  MyAttribute   = Value;
  MySource      = Source;
  MyDestination = Destination;
}

//---------------------------------------------------------------------------
// GetAttribute
//---------------------------------------------------------------------------
Attribute PCollection_Edge::GetAttribute () const 
{
  return MyAttribute;
}

//---------------------------------------------------------------------------
// SetAttribute
//---------------------------------------------------------------------------
void PCollection_Edge::SetAttribute (const Attribute& Value) 
{
  MyAttribute = Value;
}

//---------------------------------------------------------------------------
// Source
//---------------------------------------------------------------------------
Handle(PCollection_Vertex) PCollection_Edge::Source () const 
{
  return MySource;
}

//---------------------------------------------------------------------------
// Destination
//---------------------------------------------------------------------------
Handle(PCollection_Vertex) PCollection_Edge::Destination () const 
{
  return MyDestination;
}


//---------------------------------------------------------------------------
// SetSource
//---------------------------------------------------------------------------
void PCollection_Edge::SetSource (const Handle(PCollection_Vertex)& V)  
{
  MySource = V;
}

//---------------------------------------------------------------------------
// SetDestination
//---------------------------------------------------------------------------
void PCollection_Edge::SetDestination (const Handle(PCollection_Vertex)& V) 
{
  MyDestination = V;
}

//---------------------------------------------------------------------------
// Reverse
//---------------------------------------------------------------------------
void PCollection_Edge::Reverse () 
{
  Handle(PCollection_Edge) me = this;
  MyDestination->RemoveBackEdge(me);
  MySource->RemoveFrontEdge(me);
  MyDestination->AddFrontEdge(me);
  MySource->AddBackEdge(me);
  Handle (PCollection_Vertex) temp = MyDestination;
  MyDestination = MySource;
  MySource = temp;
}

//---------------------------------------------------------------------------
// IsLoop
//---------------------------------------------------------------------------
Boolean PCollection_Edge::IsLoop () const 
{
  return (MyDestination == MySource);
}