class/System/System.Diagnostics/EventLogEntryCollection.cs

   1 //
   2 // System.Diagnostics.EventLogEntryCollection.cs
   3 //
   4 // Authors:
   5 //   Jonathan Pryor (jonpryor@vt.edu)
   6 //
   7 // (C) 2002 Jonathan Pryor
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31
  32 using System;
  33 using System.Collections;
  34 using System.Diagnostics;
  35
  36 namespace System.Diagnostics {
  37
  38         public class EventLogEntryCollection : ICollection, IEnumerable {
  39
  40                 readonly EventLogImpl _impl;
  41
  42                 internal EventLogEntryCollection(EventLogImpl impl)
  43                 {
  44                         _impl = impl;
  45                 }
  46
  47                 public int Count {
  48                         get { return _impl.EntryCount; }
  49                 }
  50
  51                 public virtual EventLogEntry this [int index] {
  52                         get { return _impl[index]; }
  53                 }
  54
  55                 bool ICollection.IsSynchronized {
  56                         get { return false; }
  57                 }
  58
  59                 object ICollection.SyncRoot {
  60                         get { return this; }
  61                 }
  62
  63                 public void CopyTo (EventLogEntry[] eventLogEntries, int index)
  64                 {
  65                         EventLogEntry[] entries = _impl.GetEntries ();
  66                         Array.Copy (entries, 0, eventLogEntries, index, entries.Length);
  67                 }
  68
  69                 public IEnumerator GetEnumerator ()
  70                 {
  71                         return new EventLogEntryEnumerator (_impl);
  72                 }
  73
  74                 void ICollection.CopyTo (Array array, int index)
  75                 {
  76                         EventLogEntry[] entries = _impl.GetEntries ();
  77                         Array.Copy (entries, 0, array, index, entries.Length);
  78                 }
  79
  80                 private class EventLogEntryEnumerator : IEnumerator
  81                 {
  82                         internal EventLogEntryEnumerator (EventLogImpl impl)
  83                         {
  84                                 _impl = impl;
  85                         }
  86
  87                         object IEnumerator.Current {
  88                                 get { return Current; }
  89                         }
  90
  91                         public EventLogEntry Current {
  92                                 get {
  93 #if NET_2_0
  94                                         if (_currentEntry != null)
  95                                                 return _currentEntry;
  96 #else
  97                                         if (_currentIndex >= 0 && _currentIndex < _impl.EntryCount)
  98                                                 return _impl [_currentIndex];
  99 #endif
 100
 101                                         throw new InvalidOperationException ("No current EventLog"
 102                                                 + " entry available, cursor is located before the first"
 103                                                 + " or after the last element of the enumeration.");
 104                                 }
 105                         }
 106
 107                         public bool MoveNext ()
 108                         {
 109                                 _currentIndex++;
 110 #if NET_2_0
 111                                 if (_currentIndex >= _impl.EntryCount) {
 112                                         _currentEntry = null;
 113                                         return false;
 114                                 }
 115                                 _currentEntry = _impl [_currentIndex];
 116                                 return true;
 117 #else
 118                                 return (_currentIndex < _impl.EntryCount);
 119 #endif
 120                         }
 121
 122                         public void Reset ()
 123                         {
 124                                 _currentIndex = - 1;
 125                         }
 126
 127                         readonly EventLogImpl _impl;
 128                         int _currentIndex = -1;
 129 #if NET_2_0
 130                         EventLogEntry _currentEntry;
 131 #endif
 132                 }
 133 }
 134 }
 135