From Laurent:
[u/mrichter/AliRoot.git] / 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   fHitForRecPtr = 0;
40   fNextTrackHitWithSameHitForRec = 0;
41   fPrevTrackHitWithSameHitForRec = 0;
42 }
43   //__________________________________________________________________________
44 AliMUONTrackHit::AliMUONTrackHit (const AliMUONTrackHit& theMUONTrackHit)
45   :  TObject(theMUONTrackHit)
46 {
47   fTrackParam                    =  theMUONTrackHit.fTrackParam;
48   fHitForRecPtr                  =  theMUONTrackHit.fHitForRecPtr;
49   fNextTrackHitWithSameHitForRec =  theMUONTrackHit.fNextTrackHitWithSameHitForRec;
50   fPrevTrackHitWithSameHitForRec =  theMUONTrackHit.fPrevTrackHitWithSameHitForRec;
51 }
52   //__________________________________________________________________________
53 AliMUONTrackHit & AliMUONTrackHit::operator=(const AliMUONTrackHit& theMUONTrackHit)
54 {
55   // check assignement to self
56   if (this == &theMUONTrackHit)
57     return *this;
58
59   // base class assignement
60   TObject::operator=(theMUONTrackHit);
61
62   fTrackParam                    =  theMUONTrackHit.fTrackParam;
63   fHitForRecPtr                  =  theMUONTrackHit.fHitForRecPtr;
64   fNextTrackHitWithSameHitForRec = theMUONTrackHit.fNextTrackHitWithSameHitForRec;
65   fPrevTrackHitWithSameHitForRec = theMUONTrackHit.fPrevTrackHitWithSameHitForRec;
66
67   return *this;
68
69 }
70   //__________________________________________________________________________
71 AliMUONTrackHit::AliMUONTrackHit(AliMUONHitForRec* Hit)
72 {
73   // Constructor from the HitForRec pointed to by "Hit"
74   fHitForRecPtr = Hit; // pointer to HitForRec
75   // links from/to HitForRec
76   if (Hit->GetNTrackHits() == 0) {
77     fPrevTrackHitWithSameHitForRec = NULL;
78     Hit->SetFirstTrackHitPtr(this);
79   }
80   else {
81     fPrevTrackHitWithSameHitForRec = Hit->GetLastTrackHitPtr();
82     fNextTrackHitWithSameHitForRec = NULL;
83   }
84   Hit->SetLastTrackHitPtr(this);
85   fNextTrackHitWithSameHitForRec = NULL;
86   Hit->SetNTrackHits(Hit->GetNTrackHits() + 1);
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 }