mcs/class/corlib/System.Globalization/TextElementEnumerator.cs

   1 //
   2 // System.Globalization.TextElementEnumerator.cs
   3 //
   4 // Author:
   5 //      Dick Porter (dick@ximian.com)
   6 //
   7 // (C) 2002 Ximian, Inc.
   8 // (C) 2004 Novell, Inc.
   9 //
  10
  11 //
  12 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34 using System.Collections;
  35
  36 namespace System.Globalization {
  37
  38         [Serializable]
  39         public class TextElementEnumerator: IEnumerator {
  40                 private int index;
  41                 private int elementindex;
  42                 private int startpos;
  43                 private string str;
  44                 private string element;
  45
  46                 /* Hide the .ctor() */
  47                 internal TextElementEnumerator(string str, int startpos) {
  48                         this.index = -1;
  49                         this.startpos = startpos;
  50                         this.str = str.Substring (startpos);
  51                         this.element = null;
  52                 }
  53
  54                 public object Current
  55                 {
  56                         get {
  57                                 if (element == null) {
  58                                         throw new InvalidOperationException ();
  59                                 }
  60
  61                                 return(element);
  62                         }
  63                 }
  64
  65                 public int ElementIndex
  66                 {
  67                         get {
  68                                 if (element == null) {
  69                                         throw new InvalidOperationException ();
  70                                 }
  71
  72                                 return(elementindex + startpos);
  73                         }
  74                 }
  75
  76                 public string GetTextElement()
  77                 {
  78                         if (element == null) {
  79                                 throw new InvalidOperationException ();
  80                         }
  81
  82                         return(element);
  83                 }
  84
  85                 public bool MoveNext()
  86                 {
  87                         elementindex = index + 1;
  88
  89                         if (elementindex < str.Length) {
  90                                 element = StringInfo.GetNextTextElement (str, elementindex);
  91                                 index += element.Length;
  92
  93                                 return(true);
  94                         } else {
  95                                 element = null;
  96
  97                                 return(false);
  98                         }
  99                 }
 100
 101                 public void Reset()
 102                 {
 103                         element = null;
 104                         index = -1;
 105                 }
 106         }
 107 }