/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/DataFormats/MuonReco/src/MuonChamberMatch.cc

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#include "DataFormats/MuonDetId/interface/DTChamberId.h"
#include <DataFormats/MuonDetId/interface/MuonSubdetId.h>
#include "DataFormats/MuonDetId/interface/CSCDetId.h"
#include "DataFormats/MuonDetId/interface/RPCDetId.h"
#include "DataFormats/MuonReco/interface/MuonChamberMatch.h"
#include <cmath>
using namespace reco;

int MuonChamberMatch::station()  const {
   if( detector() ==  MuonSubdetId::DT ) {    // DT
      DTChamberId segId(id.rawId());
      return segId.station();
   }
   if( detector() == MuonSubdetId::CSC ) {    // CSC
      CSCDetId segId(id.rawId());
      return segId.station();
   }
   if( detector() == MuonSubdetId::RPC ) {    //RPC
      RPCDetId segId(id.rawId());
      return segId.station();
   }
   return -1; // is this appropriate? fix this
}

std::pair<float,float>
MuonChamberMatch::getDistancePair(float edgeX, float edgeY, float xErr, float yErr) const
{
   if(edgeX>9E5&&edgeY>9E5&&xErr>9E5&&yErr>9E5) // there is no track
      return std::make_pair(999999, 999999);

   float distance = 999999;
   float error    = 999999;

   if(edgeX<0 && edgeY<0) {
      if(edgeX<edgeY) { distance = edgeY; error = yErr; }
      else { distance = edgeX; error = xErr; }
   }
   if(edgeX<0 && edgeY>0) { distance = edgeY; error = yErr; }
   if(edgeX>0 && edgeY<0) { distance = edgeX; error = xErr; }
   if(edgeX>0 && edgeY>0) { distance = sqrt(edgeX*edgeX+edgeY*edgeY); error = distance ? sqrt(edgeX*edgeX*xErr*xErr+edgeY*edgeY*yErr*yErr)/fabs(distance) : 0; }

   return std::make_pair(distance, error);
}