AliPhysics  aaf9c62 (aaf9c62)
AliFMDStripIndex.h
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1 #ifndef ALIFMDSTRIPINDEX_H
2 #define ALIFMDSTRIPINDEX_H
3 /**************************************************************************
4  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5  * *
6  * Author: The ALICE Off-line Project. *
7  * Contributors are mentioned in the code where appropriate. *
8  * *
9  * Permission to use, copy, modify and distribute this software and its *
10  * documentation strictly for non-commercial purposes is hereby granted *
11  * without fee, provided that the above copyright notice appears in all *
12  * copies and that both the copyright notice and this permission notice *
13  * appear in the supporting documentation. The authors make no claims *
14  * about the suitability of this software for any purpose. It is *
15  * provided "as is" without express or implied warranty. *
16  **************************************************************************/
17 
18 // Struct to encode a strip address into one integer
19 // developed by Christian Holm Christensen (cholm@nbi.dk).
20 //
21 // The functions are static to ensure applicability from
22 // anywhere. This is needed to smoothly store strip addresses in track
23 // references.
24 //
25 // Added by Hans H. Dalsgaard (hans.dalsgaard@cern.ch)
26 
27 
29 {
30 public:
31  enum {
32  // Mask of ID
33  kIdMask = 0x0007FFFF,
34  // Mask of energy
35  kEMask = 0xFFF80000,
36  // Offset of energy
37  kEOffset = 19
38  };
48  virtual ~AliFMDStripIndex() {}
59  static UInt_t Pack(UShort_t det, Char_t rng, UShort_t sec, UShort_t str)
60  {
61  UInt_t irg = (rng == 'I' || rng == 'i' ? 0 : 1);
62  UInt_t id = (((str & 0x1FF) << 0) |
63  ((sec & 0x03F) << 9) |
64  ((irg & 0x001) << 16) |
65  ((det & 0x003) << 17));
66  return (id & kIdMask);
67  }
77  static void Unpack(UInt_t id,
78  UShort_t& det, Char_t& rng, UShort_t& sec, UShort_t& str)
79  {
80  UInt_t tmp = (kIdMask & id);
81  str = ((tmp >> 0) & 0x1FF);
82  sec = ((tmp >> 9) & 0x03F);
83  rng = ((tmp >> 16) & 0x001) ? 'O' : 'I';
84  det = ((tmp >> 17) & 0x003);
85  }
86  ClassDef(AliFMDStripIndex,1)
87 };
88 #endif
89 //
90 // Local Variables:
91 // mode: C++
92 // End:
93 //
char Char_t
Definition: External.C:18
unsigned int UInt_t
Definition: External.C:33
static UInt_t Pack(UShort_t det, Char_t rng, UShort_t sec, UShort_t str)
virtual ~AliFMDStripIndex()
unsigned short UShort_t
Definition: External.C:28
static void Unpack(UInt_t id, UShort_t &det, Char_t &rng, UShort_t &sec, UShort_t &str)