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 using System;
  30 using System.Collections.Specialized;
  31
  32 namespace System.Configuration {
  33
  34         /* i really hate all these "new"s... maybe
  35          * StringCollection marks these methods as virtual in
  36          * 2.0? */
  37         public sealed class CommaDelimitedStringCollection : StringCollection {
  38
  39                 bool modified;
  40                 bool readOnly;
  41                 int originalStringHash = 0;
  42
  43                 public bool IsModified {
  44                         get {
  45                                 if (modified)
  46                                         return true;
  47
  48                                 string str = ToString ();
  49                                 if (str == null)
  50                                         return false;
  51
  52                                 return str.GetHashCode () != originalStringHash;
  53                         }
  54                 }
  55
  56                 public new bool IsReadOnly {
  57                         get { return readOnly; }
  58                 }
  59
  60                 public new string this [int index] {
  61                         get { return base [index]; }
  62                         set {
  63                                 if (readOnly) throw new ConfigurationErrorsException ("The configuration is read only");
  64
  65                                 base [index] = value;
  66                                 modified = true;
  67                         }
  68                 }
  69
  70                 public new void Add (string value)
  71                 {
  72                         if (readOnly) throw new ConfigurationErrorsException ("The configuration is read only");
  73
  74                         base.Add (value);
  75                         modified = true;
  76                 }
  77
  78                 public new void AddRange (string[] range)
  79                 {
  80                         if (readOnly) throw new ConfigurationErrorsException ("The configuration is read only");
  81
  82                         base.AddRange (range);
  83                         modified = true;
  84                 }
  85
  86                 public new void Clear ()
  87                 {
  88                         if (readOnly) throw new ConfigurationErrorsException ("The configuration is read only");
  89
  90                         base.Clear ();
  91                         modified = true;
  92                 }
  93
  94                 public CommaDelimitedStringCollection Clone ()
  95                 {
  96                         CommaDelimitedStringCollection col = new CommaDelimitedStringCollection();
  97                         string[] contents = new string[this.Count];
  98                         CopyTo (contents, 0);
  99
 100                         col.AddRange (contents);
 101                         col.originalStringHash = originalStringHash;
 102
 103                         return col;
 104                 }
 105
 106                 public new void Insert (int index, string value)
 107                 {
 108                         if (readOnly) throw new ConfigurationErrorsException ("The configuration is read only");
 109
 110                         base.Insert (index, value);
 111                         modified = true;
 112                 }
 113
 114                 public new void Remove (string value)
 115                 {
 116                         if (readOnly) throw new ConfigurationErrorsException ("The configuration is read only");
 117
 118                         base.Remove (value);
 119                         modified = true;
 120                 }
 121
 122                 public void SetReadOnly ()
 123                 {
 124                         readOnly = true;
 125                 }
 126
 127                 public override string ToString ()
 128                 {
 129                         if (this.Count == 0)
 130                                 return null;
 131
 132                         string[] contents = new string[this.Count];
 133
 134                         CopyTo (contents, 0);
 135
 136                         return String.Join (",", contents);
 137                 }
 138
 139                 internal void UpdateStringHash ()
 140                 {
 141                         string str = ToString ();
 142                         if (str == null)
 143                                 originalStringHash = 0;
 144                         else
 145                                 originalStringHash = str.GetHashCode ();
 146                 }
 147         }
 148
 149 }