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listEventiterator.cc
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1 //
2 // listEventIterator mlp 4/19/1997
3 //
4 // this iterator reads events froma data file.
5 
6 
7 #include "listEventiterator.h"
8 #include <stddef.h>
9 #include <string.h>
10 
11 // there are two similar constructors, one with just the
12 // filename, the other with an additional status value
13 // which is non-zero on return if anything goes wrong.
14 
15 
16 listEventiterator::~listEventiterator()
17 {
18  if (it) delete it;
19  if (liststream) delete liststream;
20  if ( listfilename ) delete [] listfilename;
21 }
22 
23 
24 listEventiterator::listEventiterator(const char *filename)
25 {
26  listfilename = new char[strlen(filename)+1];
27  strcpy (listfilename, filename);
28 
29  liststream = new std::ifstream(filename);
30  finished = 0;
31  defunct = 0;
32 #ifdef OSF1
33  if (liststream)
34 #else
35  if (!liststream->is_open() )
36 #endif
37  {
38  defunct = 1;
39  finished = 1;
40  }
41  it = 0;
42  strcpy(thefilename, " ");
43 }
44 
45 
46 listEventiterator::listEventiterator(const char *filename, int &status)
47 {
48  listfilename = new char[strlen(filename)+1];
49  strcpy (listfilename, filename);
50 
51  liststream = new std::ifstream(filename);
52  finished = 0;
53  defunct = 0;
54  status = 0;
55 #ifdef OSF1
56  if (liststream)
57 #else
58  if (!liststream->is_open() )
59 #endif
60  {
61  status = 1;
62  defunct = 1;
63  finished = 1;
64  }
65  it = 0;
66  strcpy(thefilename, " ");
67 }
68 
69 
70 
71 void listEventiterator::identify (OSTREAM &os) const
72 {
73  os << "listEventiterator from list " << listfilename << ", current from " << thefilename << std::endl;
74 
75 };
76 
77 
78 const char * listEventiterator::getCurrentFileName() const
79 {
80  static char namestr[512];
81 
82  strcpy (namestr, thefilename);
83  return namestr;
84 
85 };
86 
87 
88 const char * listEventiterator::getIdTag () const
89 {
90  // sprintf (idline, " -- listEventiterator reading from %s", thefilename);
91  return "listEventiterator";
92 };
93 
94 
95 
96 // and, finally, the only non-constructor member function to
97 // retrieve events from the iterator.
98 
99 Eventiterator * listEventiterator::getNextIterator()
100 {
101 
102  Eventiterator *fit;
103  int status = 0;
104 
105  if (finished) return 0;
106 
107  if (it) return it; //protect against overwriting our own.
108 
109  while ( liststream->getline(thefilename,FEMAXFILENAMELENGTH) )
110  {
111  fit = new fileEventiterator(thefilename,status);
112  if (! status)
113  {
114  std::cout << "opened file " << thefilename << std::endl;
115  return fit;
116  }
117  }
118  finished = 1;
119  delete liststream;
120  liststream = 0;
121  return 0;
122 }
123 
124 
125 Event * listEventiterator::getNextEvent()
126 {
127  while ( ! finished) // we still have more file to process
128  {
129  if (it ==0 ) // if we don't have one open...
130  {
131  it = getNextIterator(); // try to open it
132  if (! it) // no more there, done
133  {
134  return 0;
135  }
136  }
137  Event *e = it->getNextEvent(); // get the nexct event
138  if (e) return e; // and if we got it, we're done
139  delete it; // if that prdf was exhausted, try the next one
140  it = 0;
141  }
142  return 0;
143 }