// Copyright: 	Matra-Datavision 1991
// File:	GraphDS_IncidentRelationsIterator.gxx
// Created:	Tue Sep 10 17:01:38 1991
// Author:	Denis PASCAL
//		<dp>

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

//=======================================================================
//function : GraphDS_IncidentRelationsIterator
//purpose  : 
//=======================================================================

GraphDS_IncidentRelationsIterator::GraphDS_IncidentRelationsIterator ()
{
}


//=======================================================================
//function : GraphDS_IncidentRelationsIterator
//purpose  : 
//=======================================================================

GraphDS_IncidentRelationsIterator::GraphDS_IncidentRelationsIterator 
  (const GraphDS_RelationGraph& G,
   const Handle(GraphDS_Relation)& R)
{
  Initialize (G,R);
}


//=======================================================================
//function : GraphDS_Initialize
//purpose  : 
//=======================================================================

void GraphDS_IncidentRelationsIterator::Initialize
  (const GraphDS_RelationGraph&,
   const Handle(GraphDS_Relation)& R)
{

  myMap.Clear();

  Handle(GraphDS_Entity) ENT;  
  Handle(GraphDS_Relation) REL;
  GraphDS_DataMapIteratorOfEntityRoleMap itv; 
  TColStd_MapIteratorOfMapOfTransient itr;

  for (itv.Initialize(R->GetEntities());itv.More();itv.Next()) {
    ENT = Handle(GraphDS_Entity)::DownCast(itv.Key());
    if (itv.Value() != GraphDS_OnlyOutput) {
      for (itr.Initialize(ENT->GetRelations()); itr.More(); itr.Next()) {
	REL = Handle(GraphDS_Relation)::DownCast(itr.Key());
	if (REL->IsOutput(ENT)) myMap.Add(REL);
      }
    }
  }
  myRelations.Initialize(myMap);
}


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

Standard_Boolean GraphDS_IncidentRelationsIterator::More () const
{
  return myRelations.More();
}


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

void GraphDS_IncidentRelationsIterator::Next () 
{
   myRelations.Next();
}
	

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

const Handle(GraphDS_Relation)& GraphDS_IncidentRelationsIterator::Value () const 
{  
  return  *((Handle(GraphDS_Relation)*)& myRelations.Key());
  //return Handle(GraphDS_Relation)::DownCast(myRelations.Key());
}