Added type casting in some places and moved "optional" attribute to be AFTER that...
[mono.git] / mcs / class / Microsoft.VisualBasic / Microsoft.VisualBasic / ForEachEnum.cs
1 //
2 // Microsoft.VisualBasic.ForEachEnum.cs
3 //
4 // Author:
5 //      Duncan Mak (duncan@ximian.com)
6 //      
7 // (C) 2004 Novell Inc.
8 // 
9 //
10
11 //
12 // Copyright (c) 2002-2003 Mainsoft Corporation.
13 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
14 //
15 // Permission is hereby granted, free of charge, to any person obtaining
16 // a copy of this software and associated documentation files (the
17 // "Software"), to deal in the Software without restriction, including
18 // without limitation the rights to use, copy, modify, merge, publish,
19 // distribute, sublicense, and/or sell copies of the Software, and to
20 // permit persons to whom the Software is furnished to do so, subject to
21 // the following conditions:
22 // 
23 // The above copyright notice and this permission notice shall be
24 // included in all copies or substantial portions of the Software.
25 // 
26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
33 //
34
35 using System;
36 using System.Collections;
37
38 namespace Microsoft.VisualBasic {
39         internal class ForEachEnum : IEnumerator
40         {
41                 Microsoft.VisualBasic.Collection collection;
42                 int index;
43
44                 public ForEachEnum (Collection Collection)
45                 {
46                         this.collection = collection;
47                 }
48
49                 public void AdjustIndex (int itemIndex, bool remove)
50                 {
51                         if (itemIndex <= index) {
52                                 if (remove)
53                                         index --;
54                                 else
55                                         index ++;
56                         }
57                 }
58
59                 public bool MoveNext ()
60                 {
61                         index ++;
62                         if (index > collection.Count)
63                                 return false;
64
65                         return true;
66                 }
67
68                 public void Reset ()
69                 {
70                         index = 0;
71                 }
72
73                 public object Current {
74
75                         get {
76                                 if (index > collection.Count)
77                                         return null;
78
79                                 return collection [index];
80                         }
81                 }
82         }
83 }