MUON/AliMUONTrackHit.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /* $Id$ */
  17
  18 ///////////////////////////////////////////////////////
  19 //
  20 // Reconstructed track hit
  21 // in
  22 // ALICE
  23 // dimuon
  24 // spectrometer
  25 //
  26 ///////////////////////////////////////////////////////
  27
  28 #include "AliMUONTrackHit.h"
  29 #include "AliMUONHitForRec.h"
  30 #include "AliLog.h"
  31
  32 ClassImp(AliMUONTrackHit) // Class implementation in ROOT context
  33
  34   //__________________________________________________________________________
  35 AliMUONTrackHit::AliMUONTrackHit()
  36   : TObject()
  37 {
  38 /// Default constructor
  39
  40   fHitForRecPtr = 0;
  41   fNextTrackHitWithSameHitForRec = 0;
  42   fPrevTrackHitWithSameHitForRec = 0;
  43 }
  44   //__________________________________________________________________________
  45 AliMUONTrackHit::AliMUONTrackHit (const AliMUONTrackHit& theMUONTrackHit)
  46   :  TObject(theMUONTrackHit)
  47 {
  48 /// Copy constructor
  49
  50   fTrackParam                    =  theMUONTrackHit.fTrackParam;
  51   fHitForRecPtr                  =  theMUONTrackHit.fHitForRecPtr;
  52   fNextTrackHitWithSameHitForRec =  theMUONTrackHit.fNextTrackHitWithSameHitForRec;
  53   fPrevTrackHitWithSameHitForRec =  theMUONTrackHit.fPrevTrackHitWithSameHitForRec;
  54 }
  55   //__________________________________________________________________________
  56 AliMUONTrackHit & AliMUONTrackHit::operator=(const AliMUONTrackHit& theMUONTrackHit)
  57 {
  58 /// Assignment operator
  59
  60   // check assignement to self
  61   if (this == &theMUONTrackHit)
  62     return *this;
  63
  64   // base class assignement
  65   TObject::operator=(theMUONTrackHit);
  66
  67   fTrackParam                    =  theMUONTrackHit.fTrackParam;
  68   fHitForRecPtr                  =  theMUONTrackHit.fHitForRecPtr;
  69   fNextTrackHitWithSameHitForRec = theMUONTrackHit.fNextTrackHitWithSameHitForRec;
  70   fPrevTrackHitWithSameHitForRec = theMUONTrackHit.fPrevTrackHitWithSameHitForRec;
  71
  72   return *this;
  73
  74 }
  75   //__________________________________________________________________________
  76 AliMUONTrackHit::AliMUONTrackHit(AliMUONHitForRec* Hit)
  77 {
  78 /// Constructor from the HitForRec pointed to by "Hit"
  79
  80   fHitForRecPtr = Hit; // pointer to HitForRec
  81   // links from/to HitForRec
  82   if (Hit->GetNTrackHits() == 0) {
  83     fPrevTrackHitWithSameHitForRec = NULL;
  84     Hit->SetFirstTrackHitPtr(this);
  85   }
  86   else {
  87     fPrevTrackHitWithSameHitForRec = Hit->GetLastTrackHitPtr();
  88     fNextTrackHitWithSameHitForRec = NULL;
  89   }
  90   Hit->SetLastTrackHitPtr(this);
  91   fNextTrackHitWithSameHitForRec = NULL;
  92   Hit->SetNTrackHits(Hit->GetNTrackHits() + 1);
  93 }
  94   //__________________________________________________________________________
  95 AliMUONTrackHit::~AliMUONTrackHit()
  96 {
  97 /// Destructor
  98 /// Update links between HitForRec's and TrackHit's
  99 /// connected to the current TrackHit being removed.
 100
 101   AliMUONHitForRec *hit = fHitForRecPtr; // pointer to HitForRec
 102   // remove current TrackHit in HitForRec links
 103   if (this == hit->GetFirstTrackHitPtr())
 104     hit->SetFirstTrackHitPtr(fNextTrackHitWithSameHitForRec); // if first
 105   if (this == hit->GetLastTrackHitPtr())
 106     hit->SetLastTrackHitPtr(fPrevTrackHitWithSameHitForRec); // if last
 107   hit->SetNTrackHits(hit->GetNTrackHits() - 1); // decrement NTrackHits of hit
 108   // update link to next TrackHit of previous TrackHit
 109   if (fPrevTrackHitWithSameHitForRec != NULL)
 110     fPrevTrackHitWithSameHitForRec->
 111       SetNextTrackHitWithSameHitForRec(fNextTrackHitWithSameHitForRec);
 112   // update link to previous TrackHit of next TrackHit
 113   if (fNextTrackHitWithSameHitForRec)
 114     fNextTrackHitWithSameHitForRec->
 115       SetPrevTrackHitWithSameHitForRec(fPrevTrackHitWithSameHitForRec);
 116   // to be checked thoroughly !!!!
 117   // with Root counter of AliMUONTrackHit objects,
 118   // with loop over all these links after the update
 119 }
 120
 121   //__________________________________________________________________________
 122 Int_t AliMUONTrackHit::Compare(const TObject* TrackHit) const
 123 {
 124 /// "Compare" function to sort with decreasing Z (spectro. muon Z <0).
 125 /// Returns 1 (0, -1) if Z of current TrackHit
 126 /// is smaller than (equal to, larger than) Z of TrackHit
 127
 128   if (fHitForRecPtr->GetZ() <
 129       ((AliMUONTrackHit*)TrackHit)->fHitForRecPtr->GetZ()) return(1);
 130   else if (fHitForRecPtr->GetZ() ==
 131            ((AliMUONTrackHit*)TrackHit)->fHitForRecPtr->GetZ()) return( 0);
 132   else return(-1);
 133 }