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     fTrackParam(),
  38     fHitForRecPtr(0x0),
  39     fNextTrackHitWithSameHitForRec(0x0),
  40     fPrevTrackHitWithSameHitForRec(0x0)
  41 {
  42 /// Default constructor
  43
  44 }
  45   //__________________________________________________________________________
  46 AliMUONTrackHit::AliMUONTrackHit (const AliMUONTrackHit& theMUONTrackHit)
  47   : TObject(theMUONTrackHit),
  48     fTrackParam(theMUONTrackHit.fTrackParam),
  49     fHitForRecPtr(theMUONTrackHit.fHitForRecPtr),
  50     fNextTrackHitWithSameHitForRec(theMUONTrackHit.fNextTrackHitWithSameHitForRec),
  51     fPrevTrackHitWithSameHitForRec(theMUONTrackHit.fPrevTrackHitWithSameHitForRec)
  52 {
  53 /// Copy constructor
  54
  55 }
  56   //__________________________________________________________________________
  57 AliMUONTrackHit & AliMUONTrackHit::operator=(const AliMUONTrackHit& theMUONTrackHit)
  58 {
  59 /// Assignment operator
  60
  61   // check assignement to self
  62   if (this == &theMUONTrackHit)
  63     return *this;
  64
  65   // base class assignement
  66   TObject::operator=(theMUONTrackHit);
  67
  68   fTrackParam                    =  theMUONTrackHit.fTrackParam;
  69   fHitForRecPtr                  =  theMUONTrackHit.fHitForRecPtr;
  70   fNextTrackHitWithSameHitForRec = theMUONTrackHit.fNextTrackHitWithSameHitForRec;
  71   fPrevTrackHitWithSameHitForRec = theMUONTrackHit.fPrevTrackHitWithSameHitForRec;
  72
  73   return *this;
  74
  75 }
  76   //__________________________________________________________________________
  77 AliMUONTrackHit::AliMUONTrackHit(AliMUONHitForRec* Hit)
  78   : TObject(),
  79     fTrackParam(),
  80     fHitForRecPtr(Hit),
  81     fNextTrackHitWithSameHitForRec(0x0),
  82     fPrevTrackHitWithSameHitForRec(0x0)
  83 {
  84 /// Constructor from the HitForRec pointed to by "Hit"
  85
  86   // links from/to HitForRec
  87   if (Hit->GetNTrackHits() == 0) {
  88     fPrevTrackHitWithSameHitForRec = NULL;
  89     Hit->SetFirstTrackHitPtr(this);
  90   }
  91   else {
  92     fPrevTrackHitWithSameHitForRec = Hit->GetLastTrackHitPtr();
  93     fNextTrackHitWithSameHitForRec = NULL;
  94   }
  95   Hit->SetLastTrackHitPtr(this);
  96   fNextTrackHitWithSameHitForRec = NULL;
  97   Hit->SetNTrackHits(Hit->GetNTrackHits() + 1);
  98 }
  99   //__________________________________________________________________________
 100 AliMUONTrackHit::~AliMUONTrackHit()
 101 {
 102 /// Destructor
 103 /// Update links between HitForRec's and TrackHit's
 104 /// connected to the current TrackHit being removed.
 105
 106   AliMUONHitForRec *hit = fHitForRecPtr; // pointer to HitForRec
 107   // remove current TrackHit in HitForRec links
 108   if (this == hit->GetFirstTrackHitPtr())
 109     hit->SetFirstTrackHitPtr(fNextTrackHitWithSameHitForRec); // if first
 110   if (this == hit->GetLastTrackHitPtr())
 111     hit->SetLastTrackHitPtr(fPrevTrackHitWithSameHitForRec); // if last
 112   hit->SetNTrackHits(hit->GetNTrackHits() - 1); // decrement NTrackHits of hit
 113   // update link to next TrackHit of previous TrackHit
 114   if (fPrevTrackHitWithSameHitForRec != NULL)
 115     fPrevTrackHitWithSameHitForRec->
 116       SetNextTrackHitWithSameHitForRec(fNextTrackHitWithSameHitForRec);
 117   // update link to previous TrackHit of next TrackHit
 118   if (fNextTrackHitWithSameHitForRec)
 119     fNextTrackHitWithSameHitForRec->
 120       SetPrevTrackHitWithSameHitForRec(fPrevTrackHitWithSameHitForRec);
 121   // to be checked thoroughly !!!!
 122   // with Root counter of AliMUONTrackHit objects,
 123   // with loop over all these links after the update
 124 }
 125
 126   //__________________________________________________________________________
 127 Int_t AliMUONTrackHit::Compare(const TObject* TrackHit) const
 128 {
 129 /// "Compare" function to sort with decreasing Z (spectro. muon Z <0).
 130 /// Returns 1 (0, -1) if Z of current TrackHit
 131 /// is smaller than (equal to, larger than) Z of TrackHit
 132
 133   if (fHitForRecPtr->GetZ() <
 134       ((AliMUONTrackHit*)TrackHit)->fHitForRecPtr->GetZ()) return(1);
 135   else if (fHitForRecPtr->GetZ() ==
 136            ((AliMUONTrackHit*)TrackHit)->fHitForRecPtr->GetZ()) return( 0);
 137   else return(-1);
 138 }