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
  31 ClassImp(AliMUONTrackHit) // Class implementation in ROOT context
  32
  33   //__________________________________________________________________________
  34 AliMUONTrackHit::AliMUONTrackHit()
  35   : TObject()
  36 {
  37   // Default constructor
  38   fHitForRecPtr = 0;
  39   fNextTrackHitWithSameHitForRec = 0;
  40   fPrevTrackHitWithSameHitForRec = 0;
  41 }
  42   //__________________________________________________________________________
  43 AliMUONTrackHit::AliMUONTrackHit (const AliMUONTrackHit& theMUONTrackHit)
  44   :  TObject(theMUONTrackHit)
  45 {
  46   fTrackParam                    =  theMUONTrackHit.fTrackParam;
  47   fHitForRecPtr                  =  theMUONTrackHit.fHitForRecPtr;
  48   fNextTrackHitWithSameHitForRec =  theMUONTrackHit.fNextTrackHitWithSameHitForRec;
  49   fPrevTrackHitWithSameHitForRec =  theMUONTrackHit.fPrevTrackHitWithSameHitForRec;
  50 }
  51   //__________________________________________________________________________
  52 AliMUONTrackHit & AliMUONTrackHit::operator=(const AliMUONTrackHit& theMUONTrackHit)
  53 {
  54   // check assignement to self
  55   if (this == &theMUONTrackHit)
  56     return *this;
  57
  58   // base class assignement
  59   TObject::operator=(theMUONTrackHit);
  60
  61   fTrackParam                    =  theMUONTrackHit.fTrackParam;
  62   fHitForRecPtr                  =  theMUONTrackHit.fHitForRecPtr;
  63   fNextTrackHitWithSameHitForRec = theMUONTrackHit.fNextTrackHitWithSameHitForRec;
  64   fPrevTrackHitWithSameHitForRec = theMUONTrackHit.fPrevTrackHitWithSameHitForRec;
  65
  66   return *this;
  67
  68 }
  69   //__________________________________________________________________________
  70 AliMUONTrackHit::AliMUONTrackHit(AliMUONHitForRec* Hit)
  71 {
  72   // Constructor from the HitForRec pointed to by "Hit"
  73   fHitForRecPtr = Hit; // pointer to HitForRec
  74   // links from/to HitForRec
  75   if (Hit->GetNTrackHits() == 0) {
  76     fPrevTrackHitWithSameHitForRec = NULL;
  77     Hit->SetFirstTrackHitPtr(this);
  78   }
  79   else {
  80     fPrevTrackHitWithSameHitForRec = Hit->GetLastTrackHitPtr();
  81     fNextTrackHitWithSameHitForRec = NULL;
  82   }
  83   Hit->SetLastTrackHitPtr(this);
  84   fNextTrackHitWithSameHitForRec = NULL;
  85   Hit->SetNTrackHits(Hit->GetNTrackHits() + 1);
  86 }
  87
  88   //__________________________________________________________________________
  89 AliMUONTrackHit::~AliMUONTrackHit()
  90 {
  91   // Destructor
  92   // Update links between HitForRec's and TrackHit's
  93   // connected to the current TrackHit being removed.
  94   AliMUONHitForRec *hit = fHitForRecPtr; // pointer to HitForRec
  95   // remove current TrackHit in HitForRec links
  96   if (this == hit->GetFirstTrackHitPtr())
  97     hit->SetFirstTrackHitPtr(fNextTrackHitWithSameHitForRec); // if first
  98   if (this == hit->GetLastTrackHitPtr())
  99     hit->SetLastTrackHitPtr(fPrevTrackHitWithSameHitForRec); // if last
 100   hit->SetNTrackHits(hit->GetNTrackHits() - 1); // decrement NTrackHits of hit
 101   // update link to next TrackHit of previous TrackHit
 102   if (fPrevTrackHitWithSameHitForRec != NULL)
 103     fPrevTrackHitWithSameHitForRec->
 104       SetNextTrackHitWithSameHitForRec(fNextTrackHitWithSameHitForRec);
 105   // update link to previous TrackHit of next TrackHit
 106   if (fNextTrackHitWithSameHitForRec)
 107     fNextTrackHitWithSameHitForRec->
 108       SetPrevTrackHitWithSameHitForRec(fPrevTrackHitWithSameHitForRec);
 109   // to be checked thoroughly !!!!
 110   // with Root counter of AliMUONTrackHit objects,
 111   // with loop over all these links after the update
 112 }
 113
 114   //__________________________________________________________________________
 115 Int_t AliMUONTrackHit::Compare(const TObject* TrackHit) const
 116 {
 117   // "Compare" function to sort with decreasing Z (spectro. muon Z <0).
 118   // Returns 1 (0, -1) if Z of current TrackHit
 119   // is smaller than (equal to, larger than) Z of TrackHit
 120   if (fHitForRecPtr->GetZ() <
 121       ((AliMUONTrackHit*)TrackHit)->fHitForRecPtr->GetZ()) return(1);
 122   else if (fHitForRecPtr->GetZ() ==
 123            ((AliMUONTrackHit*)TrackHit)->fHitForRecPtr->GetZ()) return( 0);
 124   else return(-1);
 125 }