// Created on: 1993-03-16
// Created by: Denis PASCAL
// Copyright (c) 1993-1999 Matra Datavision
// Copyright (c) 1999-2012 OPEN CASCADE SAS
//
// The content of this file is subject to the Open CASCADE Technology Public
// License Version 6.5 (the "License"). You may not use the content of this file
// except in compliance with the License. Please obtain a copy of the License
// at http://www.opencascade.org and read it completely before using this file.
//
// The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
// main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
//
// The Original Code and all software distributed under the License is
// distributed on an "AS IS" basis, without warranty of any kind, and the
// Initial Developer hereby disclaims all such warranties, including without
// limitation, any warranties of merchantability, fitness for a particular
// purpose or non-infringement. Please see the License for the specific terms
// and conditions governing the rights and limitations under the License.


#include <Standard_NoSuchObject.hxx>
#include <Standard_DomainError.hxx>


//=======================================================================
//function : GraphDS_DirectedGraph
//purpose  : 
//=======================================================================

GraphDS_DirectedGraph::GraphDS_DirectedGraph ()
{
}


//=======================================================================
//function : NbVertices
//purpose  : 
//=======================================================================

Standard_Integer GraphDS_DirectedGraph::NbVertices () const 
{
  return myVertices.Extent();
}


//=======================================================================
//function : NbEdges
//purpose  : 
//=======================================================================

Standard_Integer GraphDS_DirectedGraph::NbEdges () const 
{
  return myEdges.Extent();
} 


//=======================================================================
//function : IsEmpty
//purpose  : 
//=======================================================================

Standard_Boolean GraphDS_DirectedGraph::IsEmpty () const 
{
  return (myVertices.IsEmpty());
}


//=======================================================================
//function : Clear
//purpose  : 
//=======================================================================

void GraphDS_DirectedGraph::Clear ()  
{
  myVertices.Clear();
  myEdges.Clear();

}


//=======================================================================
//function : Contains
//purpose  : 
//=======================================================================

Standard_Boolean GraphDS_DirectedGraph::Contains 
  (const Handle(GraphDS_Vertex)& V) const 
{
  return myVertices.Contains(V);
}

//=======================================================================
//function : IsRoot
//purpose  : 
//=======================================================================

Standard_Boolean GraphDS_DirectedGraph::IsRoot 
  (const Handle(GraphDS_Vertex)& V,
   const Standard_Boolean ignoreselfloop) const 
{
  return V->IsRoot(ignoreselfloop);
}

//=======================================================================
//function : IsLeaf
//purpose  : 
//=======================================================================

Standard_Boolean GraphDS_DirectedGraph::IsLeaf
  (const Handle(GraphDS_Vertex)& V,    
   const Standard_Boolean ignoreselfloop) const 
{
  return V->IsLeaf(ignoreselfloop);
}

//=======================================================================
//function : Contains
//purpose  : 
//=======================================================================

Standard_Boolean GraphDS_DirectedGraph::Contains 
  (const Handle(GraphDS_Edge)& E) const 
{
  return myEdges.Contains(E);
}


//=======================================================================
//function : Add
//purpose  : 
//=======================================================================

Handle(GraphDS_Vertex) GraphDS_DirectedGraph::Add 
       (const GraphDS_Item& value) 
{
  Handle(GraphDS_Vertex) V = new GraphDS_Vertex (value);
  myVertices.Add(V);
  return V;
}


//=======================================================================
//function : Remove
//purpose  : 
//=======================================================================

void GraphDS_DirectedGraph::Remove (const Handle(GraphDS_Vertex)& V) 
{
  if (!V->GetEdges().IsEmpty()) Standard_DomainError::Raise();
  myVertices.Remove(V);
}



//=======================================================================
//function : Add
//purpose  : 
//=======================================================================

Handle(GraphDS_Edge) GraphDS_DirectedGraph::Add 
       (const Handle(GraphDS_Vertex)& source,
	const Handle(GraphDS_Vertex)& destination,
	const GraphDS_Attribute& A) 
{
  Handle(GraphDS_Edge) E = new GraphDS_Edge (source,destination,A);
  source->AddEdge (E);
  destination->AddEdge(E);
  myEdges.Add(E);
  return E;
}


//=======================================================================
//function : Remove
//purpose  : 
//=======================================================================

void GraphDS_DirectedGraph::Remove (const Handle(GraphDS_Edge)& E) 
{
  E->Source()->RemoveEdge(E); 
  E->Destination()->RemoveEdge(E);     
  myEdges.Remove(E);
}