//  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.salome-platform.org/ or email : webmaster.salome@opencascade.com
//
//
//
//  File   : SMDS_MeshEdge.cxx
//  Author : Jean-Michel BOULCOURT
//  Module : SMESH

#ifdef _MSC_VER
#pragma warning(disable:4786)
#endif

#include "SMDS_MeshEdge.hxx"
#include "SMDS_IteratorOfElements.hxx"
#include "SMDS_MeshNode.hxx"

using namespace std;

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

SMDS_MeshEdge::SMDS_MeshEdge(const SMDS_MeshNode * node1,
                             const 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;
}

class SMDS_MeshEdge_MyNodeIterator:public SMDS_ElemIterator
{
  const SMDS_MeshNode *const* myNodes;
  int myIndex;
 public:
  SMDS_MeshEdge_MyNodeIterator(const SMDS_MeshNode * const* nodes):
    myNodes(nodes),myIndex(0) {}

  bool more()
  {
    return myIndex<2;
  }

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

SMDS_ElemIteratorPtr SMDS_MeshEdge::
	elementsIterator(SMDSAbs_ElementType type) const
{
  switch(type)
  {
  case SMDSAbs_Edge:
    return SMDS_MeshElement::elementsIterator(SMDSAbs_Edge); 
  case SMDSAbs_Node:
    return SMDS_ElemIteratorPtr(new SMDS_MeshEdge_MyNodeIterator(myNodes));
  default:
    return SMDS_ElemIteratorPtr
      (new SMDS_IteratorOfElements
       (this,type, SMDS_ElemIteratorPtr(new SMDS_MeshEdge_MyNodeIterator(myNodes))));
  }
}

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;
}

/*!
 * \brief Return node by its index
 * \param ind - node index
 * \retval const SMDS_MeshNode* - the node
 * 
 * Index is wrapped if it is out of a valid range
 */
const SMDS_MeshNode* SMDS_MeshEdge::GetNode(const int ind) const
{
  return myNodes[ WrappedIndex( ind )];
}

//=======================================================================
//function : ChangeNodes
//purpose  : 
//=======================================================================

bool SMDS_MeshEdge::ChangeNodes(const SMDS_MeshNode * node1,
                                const SMDS_MeshNode * node2)
{
  myNodes[0]=node1;
  myNodes[1]=node2;
  return true;
}

