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         [System.Runtime.InteropServices.ComVisible (true)]
  40         public class TextElementEnumerator: IEnumerator {
  41                 private int index;
  42                 private int elementindex;
  43                 private int startpos;
  44                 private string str;
  45                 private string element;
  46
  47                 /* Hide the .ctor() */
  48                 internal TextElementEnumerator(string str, int startpos) {
  49                         this.index = -1;
  50                         this.startpos = startpos;
  51                         this.str = str.Substring (startpos);
  52                         this.element = null;
  53                 }
  54
  55                 public object Current
  56                 {
  57                         get {
  58                                 if (element == null) {
  59                                         throw new InvalidOperationException ();
  60                                 }
  61
  62                                 return(element);
  63                         }
  64                 }
  65
  66                 public int ElementIndex
  67                 {
  68                         get {
  69                                 if (element == null) {
  70                                         throw new InvalidOperationException ();
  71                                 }
  72
  73                                 return(elementindex + startpos);
  74                         }
  75                 }
  76
  77                 public string GetTextElement()
  78                 {
  79                         if (element == null) {
  80                                 throw new InvalidOperationException ();
  81                         }
  82
  83                         return(element);
  84                 }
  85
  86                 public bool MoveNext()
  87                 {
  88                         elementindex = index + 1;
  89
  90                         if (elementindex < str.Length) {
  91                                 element = StringInfo.GetNextTextElement (str, elementindex);
  92                                 index += element.Length;
  93
  94                                 return(true);
  95                         } else {
  96                                 element = null;
  97
  98                                 return(false);
  99                         }
 100                 }
 101
 102                 public void Reset()
 103                 {
 104                         element = null;
 105                         index = -1;
 106                 }
 107         }
 108 }