mcs/nant/src/Attributes/BooleanValidatorAttribute.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;
  23     using System.Reflection;
  24
  25     /// <summary>Indicates that field should be able to be converted into a Boolean.</summary>
  26     [AttributeUsage(AttributeTargets.Field, Inherited=true)]
  27     public class BooleanValidatorAttribute : ValidatorAttribute {
  28
  29         public BooleanValidatorAttribute() {
  30         }
  31
  32         public override string Validate(object value) {
  33             string errorMessage = null;
  34             try {
  35                 Convert.ToBoolean(value);
  36             } catch (Exception) {
  37                 errorMessage = String.Format("Cannot resolve to '{0}' to Boolean value.", value.ToString());
  38             }
  39             return errorMessage;
  40         }
  41     }
  42 }