class/System.Web/System.Web.Configuration_2.0/NullableStringValidator.cs

   1 //
   2 // NullableStringValidator.cs
   3 //
   4 // Authors:
   5 //  Atsushi Enomoto (atsushi@ximian.com)
   6 //  Lluis Sanchez Gual (lluis@novell.com)
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining
   9 // a copy of this software and associated documentation files (the
  10 // "Software"), to deal in the Software without restriction, including
  11 // without limitation the rights to use, copy, modify, merge, publish,
  12 // distribute, sublicense, and/or sell copies of the Software, and to
  13 // permit persons to whom the Software is furnished to do so, subject to
  14 // the following conditions:
  15 //
  16 // The above copyright notice and this permission notice shall be
  17 // included in all copies or substantial portions of the Software.
  18 //
  19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  20 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  22 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  23 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  24 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  25 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26 //
  27 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
  28 //
  29
  30 // copied StringValidator.cs and changed class name and just one line
  31 // in Validate() (see there).
  32
  33 #if NET_2_0
  34
  35 namespace System.Configuration
  36 {
  37         internal class NullableStringValidator: ConfigurationValidatorBase
  38         {
  39                 char[] invalidCharacters;
  40                 int maxLength;
  41                 int minLength;
  42
  43                 public NullableStringValidator (int minLength)
  44                 {
  45                         this.minLength = minLength;
  46                         maxLength = int.MaxValue;
  47                 }
  48
  49                 public NullableStringValidator (int minLength, int maxLength)
  50                 {
  51                         this.minLength = minLength;
  52                         this.maxLength = maxLength;
  53                 }
  54
  55                 public NullableStringValidator (int minLength, int maxLength, string invalidCharacters)
  56                 {
  57                         this.minLength = minLength;
  58                         this.maxLength = maxLength;
  59                         if (invalidCharacters != null)
  60                                 this.invalidCharacters = invalidCharacters.ToCharArray ();
  61                 }
  62
  63                 public override bool CanValidate (Type type)
  64                 {
  65                         return type == typeof(string);
  66                 }
  67
  68                 public override void Validate (object value)
  69                 {
  70                         // This is the only difference from StringValidator:
  71                         // null value is always allowed.
  72                         if (value == null)
  73                                 return;
  74
  75                         string s = (string) value;
  76                         if (s == null || s.Length < minLength)
  77                                 throw new ArgumentException ("The string must be at least " + minLength + " characters long.");
  78                         if (s.Length > maxLength)
  79                                 throw new ArgumentException ("The string must be no more than " + maxLength + " characters long.");
  80                         if (invalidCharacters != null) {
  81                                 int i = s.IndexOfAny (invalidCharacters);
  82                                 if (i != -1)
  83                                         throw new ArgumentException (String.Format ("The string cannot contain any of the following characters: '{0}'.", invalidCharacters));
  84                         }
  85                 }
  86         }
  87 }
  88
  89 #endif