//  SMESH SMDS : implementaion of Salome mesh data structure
//
//  Copyright (C) 2003  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
//  CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS 
// 
//  This library is free software; you can redistribute it and/or 
//  modify it under the terms of the GNU Lesser General Public 
//  License as published by the Free Software Foundation; either 
//  version 2.1 of the License. 
// 
//  This library is distributed in the hope that it will be useful, 
//  but WITHOUT ANY WARRANTY; without even the implied warranty of 
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
//  Lesser General Public License for more details. 
// 
//  You should have received a copy of the GNU Lesser General Public 
//  License along with this library; if not, write to the Free Software 
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA 
// 
//  See http://www.opencascade.org/SALOME/ or email : webmaster.salome@opencascade.org 
//
//
//
//  File   : SMDS_MeshEdge.cxx
//  Author : Jean-Michel BOULCOURT
//  Module : SMESH


#include "SMDS_MeshEdge.hxx"
#include "SMDS_IteratorOfElements.hxx"
#include "SMDS_MeshNode.hxx"
#include <iostream>

//=======================================================================
//function : SMDS_MeshEdge
//purpose  : 
//=======================================================================

SMDS_MeshEdge::SMDS_MeshEdge(SMDS_MeshNode * node1, SMDS_MeshNode * node2)
{	
	myNodes[0]=node1;
	myNodes[1]=node2;
}

//=======================================================================
//function : Print
//purpose  : 
//=======================================================================

void SMDS_MeshEdge::Print(ostream & OS) const
{
	OS << "edge <" << GetID() << "> : (" << myNodes[0] << " , " << myNodes[1] <<
		") " << endl;
}

int SMDS_MeshEdge::NbNodes() const
{
	return 2;
}

int SMDS_MeshEdge::NbEdges() const
{
	return 1;
}

SMDSAbs_ElementType SMDS_MeshEdge::GetType() const
{
	return SMDSAbs_Edge;
}

SMDS_Iterator<const SMDS_MeshElement *> * SMDS_MeshEdge::
	elementsIterator(SMDSAbs_ElementType type) const
{
	class MyNodeIterator:public SMDS_Iterator<const SMDS_MeshElement *>
	{
		SMDS_MeshNode *const* myNodes;
		int myIndex;
	  public:
		MyNodeIterator(SMDS_MeshNode * const* nodes):myNodes(nodes),myIndex(0)
		{}	

		bool more()
		{
			return myIndex<2;
		}

		const SMDS_MeshElement* next()
		{
			myIndex++;
			return myNodes[myIndex-1];
		}	
	};

	switch(type)
	{
	case SMDSAbs_Edge:return SMDS_MeshElement::elementsIterator(SMDSAbs_Edge); 
	case SMDSAbs_Node:return new MyNodeIterator(myNodes);
	default: return new SMDS_IteratorOfElements(this,type, nodesIterator());
	}

}

bool operator<(const SMDS_MeshEdge & e1, const SMDS_MeshEdge & e2)
{
	int id11=e1.myNodes[0]->GetID();
	int id21=e2.myNodes[0]->GetID();
	int id12=e1.myNodes[1]->GetID();
	int id22=e2.myNodes[1]->GetID();
	int tmp;

	if(id11>=id12) 
	{
		tmp=id11;
		id11=id12;
		id12=tmp;	
	}
	if(id21>=id22) 
	{
		tmp=id21;
		id21=id22;
		id22=tmp;	
	}

	if(id11<id21) return true;
	else if(id11==id21) return (id21<id22);
	else return false;
}