/data/refman/pasoursint/CMSSW_6_1_2_SLHC2/src/CalibMuon/CSCCalibration/src/CSCIndexerBase.cc

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#include "CalibMuon/CSCCalibration/interface/CSCIndexerBase.h"

CSCIndexerBase::CSCIndexerBase()
: chamberLabel_(271) // # of physical chambers per endcap + 1. Includes ME42.
{
  // Fill the member vector which permits decoding of the linear chamber index.
  // Beware that the ME42 indices 235-270 within this vector do NOT correspond to
  // their 'real' linear indices (which are 469-504 for +z)
  IndexType count = 0;
  chamberLabel_[count] = 0;

  for ( IndexType is = 1 ; is <= 4; ++is )
  {
    IndexType irmax = ringsInStation(is);
    for ( IndexType ir = 1; ir <= irmax; ++ir )
    {
      IndexType icmax = chambersInRingOfStation(is, ir);
      for ( IndexType ic = 1; ic <= icmax; ++ic )
      {
        chamberLabel_[ ++count ] = is*1000 + ir*100 + ic ;
      }
    }
  }
}


CSCIndexerBase::~CSCIndexerBase() {}


CSCIndexerBase::IndexType CSCIndexerBase::chamberLabelFromChamberIndex( IndexType ici ) const
{
  // This is just for cross-checking

  // Expected range of input range argument is 1-540.
  // 1-468 for CSCs installed at 2008 start-up. 469-540 for ME42.

  if ( ici > 468 )
  {
    // ME42
    ici -= 234; // now in range 235-306
    if ( ici > 270 ) // -z
    {
      ici -= 36; // now in range 235-270
    }
  }
  else // in range 1-468
  {
    if ( ici > 234 ) // -z
    {
      ici -= 234; // now in range 1-234
    }
  }
  return chamberLabel_[ici];
}


CSCIndexerBase::IndexType CSCIndexerBase::hvSegmentIndex(IndexType is, IndexType ir, IndexType iwire ) const
{
  IndexType hvSegment = 1;   // There is only one HV segment in ME1/1

  if (is > 2 && ir == 1)        // HV segments are the same in ME3/1 and ME4/1
  {
    if      ( iwire >= 33 && iwire <= 64 ) { hvSegment = 2; }
    else if ( iwire >= 65 && iwire <= 96 ) { hvSegment = 3; }
  }
  else if (is > 1 && ir == 2) // HV segments are the same in ME2/2, ME3/2, and ME4/2
  {
    if      ( iwire >= 17 && iwire <= 28 ) { hvSegment = 2; }
    else if ( iwire >= 29 && iwire <= 40 ) { hvSegment = 3; }
    else if ( iwire >= 41 && iwire <= 52 ) { hvSegment = 4; }
    else if ( iwire >= 53 && iwire <= 64 ) { hvSegment = 5; }
  }
  else if (is == 1 && ir == 2)
  {
    if      ( iwire >= 25 && iwire <= 48 ) { hvSegment = 2; }
    else if ( iwire >= 49 && iwire <= 64 ) { hvSegment = 3; }
  }
  else if (is == 1 && ir == 3)
  {
    if      ( iwire >= 13 && iwire <= 22 ) { hvSegment = 2; }
    else if ( iwire >= 23 && iwire <= 32 ) { hvSegment = 3; }
  }
  else if (is == 2 && ir == 1)
  {
    if      ( iwire >= 45 && iwire <= 80 ) { hvSegment = 2; }
    else if ( iwire >= 81 && iwire <= 112) { hvSegment = 3; }
  }
  return hvSegment;
}


CSCDetId CSCIndexerBase::detIdFromChamberLabel( IndexType ie, IndexType label ) const
{
  IndexType is = label/1000;
  label -= is*1000;
  IndexType ir = label/100;
  label -= ir*100;
  IndexType ic = label;

  return CSCDetId( ie, is, ir, ic );
}


CSCDetId CSCIndexerBase::detIdFromChamberIndex( IndexType ici ) const
{
  // Expected range of input range argument is 1-540.
  // 1-468 for CSCs installed at 2008 start-up. 469-540 for ME42.

  IndexType ie = 1;
  if ( ici > 468 )
  {
    // ME42
    ici -= 234; // now in range 235-306
    if ( ici > 270 ) // -z
    {
      ie = 2;
      ici -= 36; // now in range 235-270
    }
  }
  else // in range 1-468
  {
    if ( ici > 234 ) // -z
    {
      ie = 2;
      ici -= 234; // now in range 1-234
    }
  }

  IndexType label = chamberLabel_[ici];
  return detIdFromChamberLabel( ie, label );
}


CSCDetId CSCIndexerBase::detIdFromLayerIndex( IndexType ili ) const
{
  IndexType il = (ili - 1)%6 + 1;
  IndexType ici = (ili - 1)/6 + 1;
  CSCDetId id = detIdFromChamberIndex( ici );

  return CSCDetId(id.endcap(), id.station(), id.ring(), id.chamber(), il);
}