Conversion of survey data into alignable objects implemented

[u/mrichter/AliRoot.git] / TRD / AliTRDtimeBin.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */
             
////////////////////////////////////////////////////////////////////////////
//                                                                        //
//  Hit compression class                                                 //
//  Adapted from AliTPCTimeBin by Marian                                  //
//                                                                        //
////////////////////////////////////////////////////////////////////////////
                   
#include "AliTRDcluster.h" 
#include "AliTRDtimeBin.h" 

ClassImp(AliTRDtimeBin)

//_____________________________________________________________________________
AliTRDtimeBin::AliTRDtimeBin() 
  :TObject()
  ,fN(0)
{
  //
  // Default constructor
  //

  for (UInt_t i = 0; i < kMaxClusterPerTimeBin; i++) { 
    fClusters[i] = 0;
  }

}

//_____________________________________________________________________________
void AliTRDtimeBin::InsertCluster(AliTRDcluster* c, UInt_t index) 
{
  //
  // Insert cluster in TimeBin cluster array.
  // Clusters are sorted according to Y coordinate.  
  //

  if (fN == kMaxClusterPerTimeBin) {
    AliError("Too many clusters!\n"); 
    return;
  }

  if (fN == 0) {
    fIndex[0]       = index; 
    fClusters[fN++] = c; 
    return;
  }

  Int_t i = Find(c->GetY());

  memmove(fClusters+i+1,fClusters+i,(fN-i)*sizeof(AliTRDcluster*));
  memmove(fIndex   +i+1,fIndex   +i,(fN-i)*sizeof(UInt_t)); 

  fIndex[i]    = index; 
  fClusters[i] = c; 
  fN++;

}  

//_____________________________________________________________________________
Int_t AliTRDtimeBin::Find(Double_t y) const 
{
  //
  // Returns index of the cluster nearest in Y    
  //

  if (y <= fClusters[   0]->GetY()) {
    return 0;
  }
  if (y >  fClusters[fN-1]->GetY()) {
    return fN;
  }

  Int_t b = 0;
  Int_t e = fN - 1;
  Int_t m = (b + e) / 2;

  for ( ; b < e; m = (b+e)/2) {
    if (y > fClusters[m]->GetY()) {
      b = m + 1;
    }
    else {
      e = m;
    }
  }

  return m;

}    

//_____________________________________________________________________________
AliTRDcluster *AliTRDtimeBin::operator[](Int_t i)
{
  //
  // Index operator
  //
 
  return fClusters[i];

}