CaloCompactCellTool.h

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//Dear emacs, this is -*-c++-*-
/*
  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef CALOTPCNV_CALOCOMPACTCELLTOOL_H
#define CALOTPCNV_CALOCOMPACTCELLTOOL_H

 
#include "CaloEvent/CaloCellContainer.h"
#include "CaloEvent/CaloCompactCellContainer.h"
#include "CaloIdentifier/CaloCell_ID.h"
#include "CLHEP/Units/SystemOfUnits.h"
 
#include <math.h>
 
 
class IChronoStatSvc;
namespace SG {
  class ThinningDecisionBase;
}
 
class CaloCompactCellTool
{
 public:
  enum KNOWN_VERSIONS {
    VERSION_400 = 400,
    VERSION_500 = 500,
    VERSION_501 = 501,
    VERSION_502 = 502,
    VERSION_503 = 503,
    VERSION_504 = 504,
 
    // Select the latest version.
    VERSION_LATEST = -1
  };
 
  CaloCompactCellTool();
 
  StatusCode getTransient(const CaloCompactCellContainer & theCompactContainer,
              CaloCellContainer * theCellContainer);
  // fills a CaloCellContainer ; caller has the responsibility
  // of creating and deleting the object again
 
  StatusCode getPersistent(const CaloCellContainer & theCellContainer,
               CaloCompactCellContainer * theCompactContainer,
                           const SG::ThinningDecisionBase* dec,
               int theVersion = VERSION_LATEST);
  // fills a CaloCompactCellContainer ; caller has the responsibility
  // of creating and deleting the object again
 
 private:
 
  int getLogCompact(const double & x, const double & log_x0, const double & log_x1, const int & n);
 
  double unpackLog(const int & log_x, const double & log_x0, const double & log_x1, const int & n);
 
  int getCubRootCompact(const double & x, const double & cbrt_x1, const int & n);
 
  double unpackCubRoot(const int & cbrt_x, const double & cbrt_x1, const int & n);
 
};
 
inline int CaloCompactCellTool::getLogCompact(const double & x,
                       const double & log_x0,
                       const double & log_x1,
                       const int & n)
{
  int result = 0;
  if ( x > 0 ) {
    double log_x = log(x);
    if ( log_x >= log_x1 ) {
      result = (1<<n)-1;
    }
    else if ( log_x > log_x0 ) {
      int nmax=1<<n;
      result = (int)((log_x - log_x0)/(log_x1 - log_x0)*nmax);
    }
  }
  return result;
}
 
inline int CaloCompactCellTool::getCubRootCompact(const double & x,
                       const double & cbrt_x1,
                       const int & n){
  int result = 0;
  double cbrt_x=cbrt(x);
  if ( cbrt_x >= cbrt_x1 ) {
      result = (1<<n)-1;
      } else {
      int nmax=1<<n;
      result = (int)(cbrt_x/cbrt_x1*nmax);
      }
  return result;
}
 
inline double CaloCompactCellTool::unpackLog(const int & log_x,
                      const double & log_x0,
                      const double & log_x1,
                      const int & n){
  double result = 0;
  if ( log_x > 0 ) {
    int nmax=1<<n;
    result = exp((log_x+0.5)*(log_x1-log_x0)/nmax+log_x0);
    }
  return result;
}
 
inline double CaloCompactCellTool::unpackCubRoot(const int & cbrt_x,
                      const double & cbrt_x1,
                      const int & n){
  double result = 0;
  if ( cbrt_x > 0 ) {
    int nmax=1<<n;
    double r = (cbrt_x+0.5)*cbrt_x1/nmax;
    result =r*r*r;
    }
  return result;
}
 
 
#endif