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 using System.Collections;
  12
  13 namespace System.Globalization {
  14
  15         [Serializable]
  16         public class TextElementEnumerator: IEnumerator {
  17                 private int index;
  18                 private int elementindex;
  19                 private int startpos;
  20                 private string str;
  21                 private string element;
  22
  23                 /* Hide the .ctor() */
  24                 internal TextElementEnumerator(string str, int startpos) {
  25                         this.index = -1;
  26                         this.startpos = startpos;
  27                         this.str = str.Substring (startpos);
  28                         this.element = null;
  29                 }
  30
  31                 public object Current
  32                 {
  33                         get {
  34                                 if (element == null) {
  35                                         throw new InvalidOperationException ();
  36                                 }
  37
  38                                 return(element);
  39                         }
  40                 }
  41
  42                 public int ElementIndex
  43                 {
  44                         get {
  45                                 if (element == null) {
  46                                         throw new InvalidOperationException ();
  47                                 }
  48
  49                                 return(elementindex + startpos);
  50                         }
  51                 }
  52
  53                 public string GetTextElement()
  54                 {
  55                         if (element == null) {
  56                                 throw new InvalidOperationException ();
  57                         }
  58
  59                         return(element);
  60                 }
  61
  62                 public bool MoveNext()
  63                 {
  64                         elementindex = index + 1;
  65
  66                         if (elementindex < str.Length) {
  67                                 element = StringInfo.GetNextTextElement (str, elementindex);
  68                                 index += element.Length;
  69
  70                                 return(true);
  71                         } else {
  72                                 element = null;
  73
  74                                 return(false);
  75                         }
  76                 }
  77
  78                 public void Reset()
  79                 {
  80                         element = null;
  81                         index = -1;
  82                 }
  83         }
  84 }