mcs/nant/src/PropertyDictionary.cs

   1 // NAnt - A .NET build tool
   2 // Copyright (C) 2001 Gerry Shaw
   3 //
   4 // This program is free software; you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation; either version 2 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // This program is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with this program; if not, write to the Free Software
  16 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17 //
  18 // Gerry Shaw (gerry_shaw@yahoo.com)
  19
  20 namespace SourceForge.NAnt {
  21
  22     using System.Collections;
  23     using System.Collections.Specialized;
  24
  25     public class PropertyDictionary : DictionaryBase {
  26
  27         /// <summary>
  28         /// Maintains a list of the property names that are readonly.
  29         /// </summary>
  30         StringCollection _readOnlyProperties = new StringCollection();
  31
  32         /// <summary>
  33         /// Adds a property that cannot be changed.
  34         /// </summary>
  35         /// <remarks>
  36         /// Properties added with this method can never be changed.  Note that
  37         /// they are removed if the <c>Clear</c> method is called.
  38         /// </remarks>
  39         /// <param name="name">Name of property</param>
  40         /// <param name="value">Value of property</param>
  41         public void AddReadOnly(string name, string value) {
  42             if (!_readOnlyProperties.Contains(name)) {
  43                 _readOnlyProperties.Add(name);
  44                 Dictionary.Add(name, value);
  45             }
  46         }
  47
  48         /// <summary>
  49         /// Adds a property to the collection.
  50         /// </summary>
  51         /// <param name="name">Name of property</param>
  52         /// <param name="value">Value of property</param>
  53         public void Add(string name, string value) {
  54             if (!_readOnlyProperties.Contains(name)) {
  55                 Dictionary.Add(name, value);
  56             }
  57         }
  58
  59         public string this[string name] {
  60             get { return (string) Dictionary[(object) name]; }
  61             set {
  62                 if (!_readOnlyProperties.Contains(name)) {
  63                     Dictionary[name] = value;
  64                 }
  65             }
  66         }
  67
  68         protected override void OnClear() {
  69             _readOnlyProperties.Clear();
  70         }
  71     }
  72 }