mcs/nant/src/Attributes/Int32ValidatorAttribute.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 Int32 within the given range.</summary>
  26     [AttributeUsage(AttributeTargets.Field, Inherited=true)]
  27     public class Int32ValidatorAttribute : ValidatorAttribute {
  28
  29         int _minValue = Int32.MinValue;
  30         int _maxValue = Int32.MaxValue;
  31
  32         public Int32ValidatorAttribute() {
  33         }
  34
  35         public Int32ValidatorAttribute(int minValue, int maxValue) {
  36             MinValue = minValue;
  37             MaxValue = maxValue;
  38         }
  39
  40         public int MinValue {
  41             get { return _minValue; }
  42             set { _minValue = value; }
  43         }
  44
  45         public int MaxValue {
  46             get { return _maxValue; }
  47             set { _maxValue = value; }
  48         }
  49
  50         public override string Validate(object value) {
  51             string errorMessage = null;
  52             try {
  53                 Int32 intValue = Convert.ToInt32(value);
  54                 if (intValue < MinValue || intValue > MaxValue) {
  55                     errorMessage = String.Format("Cannot resolve '{0}' to integer between '{1}' and '{2}'.", value.ToString(), MinValue, MaxValue);
  56                 }
  57             } catch (Exception) {
  58                 errorMessage = String.Format("Cannot resolve '{0}' to integer value.", value.ToString());
  59             }
  60             return errorMessage;
  61         }
  62     }
  63 }