mcs/class/System.Configuration/System.Configuration/CommaDelimitedStringCollection.cs

   1 //
   2 // System.Configuration.CommaDelimitedStringCollection.cs
   3 //
   4 // Authors:
   5 //      Chris Toshok (toshok@ximian.com)
   6 //
   7 // Permission is hereby granted, free of charge, to any person obtaining
   8 // a copy of this software and associated documentation files (the
   9 // "Software"), to deal in the Software without restriction, including
  10 // without limitation the rights to use, copy, modify, merge, publish,
  11 // distribute, sublicense, and/or sell copies of the Software, and to
  12 // permit persons to whom the Software is furnished to do so, subject to
  13 // the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be
  16 // included in all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  22 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25 //
  26 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
  27 //
  28
  29 #if NET_2_0
  30 using System;
  31 using System.Collections.Specialized;
  32
  33 namespace System.Configuration {
  34
  35         /* i really hate all these "new"s... maybe
  36          * StringCollection marks these methods as virtual in
  37          * 2.0? */
  38         public sealed class CommaDelimitedStringCollection : StringCollection {
  39
  40                 bool modified;
  41                 bool readOnly;
  42                 int originalStringHash = 0;
  43
  44                 public bool IsModified {
  45                         get {
  46                                 if (modified)
  47                                         return true;
  48
  49                                 string str = ToString ();
  50                                 if (str == null)
  51                                         return false;
  52
  53                                 return str.GetHashCode () != originalStringHash;
  54                         }
  55                 }
  56
  57                 public new bool IsReadOnly {
  58                         get { return readOnly; }
  59                 }
  60
  61                 public new string this [int index] {
  62                         get { return base [index]; }
  63                         set {
  64                                 if (readOnly) throw new ConfigurationErrorsException ("The configuration is read only");
  65
  66                                 base [index] = value;
  67                                 modified = true;
  68                         }
  69                 }
  70
  71                 public new void Add (string value)
  72                 {
  73                         if (readOnly) throw new ConfigurationErrorsException ("The configuration is read only");
  74
  75                         base.Add (value);
  76                         modified = true;
  77                 }
  78
  79                 public new void AddRange (string[] range)
  80                 {
  81                         if (readOnly) throw new ConfigurationErrorsException ("The configuration is read only");
  82
  83                         base.AddRange (range);
  84                         modified = true;
  85                 }
  86
  87                 public new void Clear ()
  88                 {
  89                         if (readOnly) throw new ConfigurationErrorsException ("The configuration is read only");
  90
  91                         base.Clear ();
  92                         modified = true;
  93                 }
  94
  95                 public CommaDelimitedStringCollection Clone ()
  96                 {
  97                         CommaDelimitedStringCollection col = new CommaDelimitedStringCollection();
  98                         string[] contents = new string[this.Count];
  99                         CopyTo (contents, 0);
 100
 101                         col.AddRange (contents);
 102                         col.originalStringHash = originalStringHash;
 103
 104                         return col;
 105                 }
 106
 107                 public new void Insert (int index, string value)
 108                 {
 109                         if (readOnly) throw new ConfigurationErrorsException ("The configuration is read only");
 110
 111                         base.Insert (index, value);
 112                         modified = true;
 113                 }
 114
 115                 public new void Remove (string value)
 116                 {
 117                         if (readOnly) throw new ConfigurationErrorsException ("The configuration is read only");
 118
 119                         base.Remove (value);
 120                         modified = true;
 121                 }
 122
 123                 public void SetReadOnly ()
 124                 {
 125                         readOnly = true;
 126                 }
 127
 128                 public override string ToString ()
 129                 {
 130                         if (this.Count == 0)
 131                                 return null;
 132
 133                         string[] contents = new string[this.Count];
 134
 135                         CopyTo (contents, 0);
 136
 137                         return String.Join (",", contents);
 138                 }
 139
 140                 internal void UpdateStringHash ()
 141                 {
 142                         string str = ToString ();
 143                         if (str == null)
 144                                 originalStringHash = 0;
 145                         else
 146                                 originalStringHash = str.GetHashCode ();
 147                 }
 148         }
 149
 150 }
 151
 152 #endif