//-*- Mode: C++ -*-
// $Id$
#ifndef ALIHLTTRIGGERBARRELMULTIPLICITY_H
#define ALIHLTTRIGGERBARRELMULTIPLICITY_H
//* This file is property of and copyright by the ALICE HLT Project        * 
//* ALICE Experiment at CERN, All rights reserved.                         *
//* See cxx source for full Copyright notice                               *

/// @file   AliHLTTriggerBarrelMultiplicity.h
/// @author Matthias Richter
/// @date   2009-06-30
/// @brief  HLT trigger component for charged particle multiplicity in
///         the central barrel.

#include "AliHLTTrigger.h"
#include "TString.h"

class AliESDtrack;

/**
 * @class  AliHLTTriggerBarrelMultiplicity
 * HLT trigger component for charged particle multiplicity in the
 * central barrel.
 * 
 * Triggers on charged particle number in a certain pt range and geometrical
 * acceptance
 * 
 * Multiple instances of this component can serve different trigger
 * conditions, i.e. component parameters. The different instances get
 * different names, specified by the '-triggername' component argument.
 * The configuration is loaded from OCDB entries according to the name, see
 * below.
 *
 * <h2>General properties:</h2>
 *
 * Component ID: \b BarrelMultiplicityTrigger                             <br>
 * Library: \b libAliHLTTrigger.so                                        <br>
 * Input Data Types:  kAliHLTDataTypeESDObject, kAliHLTDataTypeESDTree
 *                    kAliHLTDataTypeTrack                                <br>
 * Output Data Types: ::kAliHLTAnyDataType                                <br>
 *
 * <h2>Mandatory arguments:</h2>
 * <!-- NOTE: ignore the \li. <i> and </i>: it's just doxygen formatting -->
 *
 * <h2>Optional arguments:</h2>
 * <!-- NOTE: ignore the \li. <i> and </i>: it's just doxygen formatting -->
 *
 * <h2>Configuration:</h2>
 * <!-- NOTE: ignore the \li. <i> and </i>: it's just doxygen formatting -->
 * \li -mintracks     <i> n   </i> <br>
 *      required number of tracks for a trigger
 * \li -minpt    <i> pt  </i> <br>
 *      required minimum pt for a trigger
 * \li -maxpt    <i> pt  </i> <br>
 *      required maximum pt for a trigger
 * \li -dca-reference    <i> x,y,z  </i> <br>
 *      reference point for the transverse and longitudinal dca cut
 * \li -min-ldca    <i> dca  </i> <br>
 *      minimum longitudinal dca to reference point
 * \li -max-ldca    <i> dca  </i> <br>
 *      maximum longitudinal dca to reference point
 * \li -min-tdca    <i> dca  </i> <br>
 *      minimum transverse dca to reference point
 * \li -max-tdca    <i> dca  </i> <br>
 *      maximum transverse dca to reference point
 * \li  -triggername    <i> name  </i> <br>
 *      The name of this specific trigger.
 *
 * By default, configuration is loaded from OCDB, can be overridden by
 * component arguments.
 *
 * <h2>Default CDB entries:</h2>
 * HLT/ConfigHLT/BarrelMultiplicityTrigger: TObjString storing the arguments <br>
 * HLT/ConfigHLT/<name>: for triggers with specific names
 *
 * <h2>Performance:</h2>
 * 
 *
 * <h2>Memory consumption:</h2>
 * 
 *
 * <h2>Output size:</h2>
 * 
 *
 * \ingroup alihlt_trigger_components
 */
class AliHLTTriggerBarrelMultiplicity : public AliHLTTrigger
{
 public:
  AliHLTTriggerBarrelMultiplicity();
  ~AliHLTTriggerBarrelMultiplicity();

  /// inherited from AliHLTTrigger: name of this trigger
  virtual const char* GetTriggerName() const;
  /// inherited from AliHLTComponent: create an instance
  virtual AliHLTComponent* Spawn();

 protected:
  /// inherited from AliHLTComponent: handle the initialization
  int DoInit(int argc, const char** argv);

  /// inherited from AliHLTComponent: handle cleanup
  int DoDeinit();

  /// inherited from AliHLTComponent: handle re-configuration event
  int Reconfigure(const char* cdbEntry, const char* chainId);

  /// inherited from AliHLTComponent: handle dcs update event
  int ReadPreprocessorValues(const char* modules);

  /// inherited from AliHLTComponent, scan one argument and
  /// its parameters
  int ScanConfigurationArgument(int argc, const char** argv);

 private:

  /// inherited from AliHLTTrigger: calculate the trigger
  virtual int DoTrigger();

  /// check whether a track meets the criteria
  template<class T>
  bool CheckCondition(T* track, float b);

  /// pt cut, minimum
  float fPtMin; //! transient
  /// pt cut, maximum
  float fPtMax; //! transient
  /// required number of tracks
  int fMinTracks; //!transient

  /// number of coordinates for the DCA reference point
  const static short fgkDCAReferenceSize=3;
  /// reference point for the transverse and longitudinal dca cut
  float fDCAReference[fgkDCAReferenceSize];
  /// minimum longitudinal dca to reference point
  float fMinLDca; //!transient
  /// maximum longitudinal dca to reference point
  float fMaxLDca; //!transient
  /// minimum transverse dca to reference point
  float fMinTDca; //!transient
  /// maximum transverse dca to reference point
  float fMaxTDca; //!transient
  /// magnetic field (dca estimation for)
  float fSolenoidBz; //!transient
  /// name of the trigger
  TString fName; //!transient

  /// the default configuration entry for this component
  static const char* fgkDefaultOCDBEntry; //!transient

  ClassDef(AliHLTTriggerBarrelMultiplicity, 0)
};
#endif //ALIHLTTRIGGERBARRELMULTIPLICITY_H