Fix operator != handling of LHS null
[mono.git] / mcs / class / System.Runtime.Caching / System.Runtime.Caching / CacheItemPolicy.cs
1 //
2 // CacheItemPolicy.cs
3 //
4 // Authors:
5 //      Marek Habersack <mhabersack@novell.com>
6 //
7 // Copyright (C) 2010 Novell, Inc. (http://novell.com/)
8 //
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
16 // 
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
19 // 
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 //
28 using System;
29 using System.Collections.ObjectModel;
30
31 namespace System.Runtime.Caching
32 {
33         public class CacheItemPolicy
34         {
35                 Collection<ChangeMonitor> changeMonitors;
36                 
37                 public DateTimeOffset AbsoluteExpiration { get; set; }
38
39                 public Collection<ChangeMonitor> ChangeMonitors {
40                         get {
41                                 if (changeMonitors == null)
42                                         changeMonitors = new Collection <ChangeMonitor> ();
43
44                                 return changeMonitors;
45                         }
46                 }
47
48                 public CacheItemPriority Priority { get; set; }
49                 public CacheEntryRemovedCallback RemovedCallback { get; set; }
50                 public TimeSpan SlidingExpiration { get; set; }
51                 public CacheEntryUpdateCallback UpdateCallback { get; set; }
52                 
53                 public CacheItemPolicy ()
54                 {
55                         this.AbsoluteExpiration = ObjectCache.InfiniteAbsoluteExpiration;
56                         this.Priority = CacheItemPriority.Default;
57                         this.SlidingExpiration = ObjectCache.NoSlidingExpiration;
58                 }
59         }
60 }