Components/General/Validator/Castle.Components.Validator/Validators/DecimalValidator.cs

   1 // Copyright 2004-2007 Castle Project - http://www.castleproject.org/
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 namespace Castle.Components.Validator
  16 {
  17         using System;
  18         using System.Collections;
  19
  20         /// <summary>
  21         /// This is a meta validator.
  22         /// It is only useful to test a source content before setting it on the
  23         /// target instance.
  24         /// </summary>
  25         public class DecimalValidator : AbstractValidator
  26         {
  27                 /// <summary>
  28                 /// If the <c>fieldValue</c> is not null, an attempt to convert the
  29                 /// content to a Decimal is performed, and the field is considered value
  30                 /// if the conversion is successful.
  31                 /// </summary>
  32                 /// <param name="instance">The target type instance</param>
  33                 /// <param name="fieldValue">The property/field value. It can be null.</param>
  34                 /// <returns>
  35                 ///     <c>true</c> if the value is accepted (has passed the validation test)
  36                 /// </returns>
  37                 public override bool IsValid(object instance, object fieldValue)
  38                 {
  39                         if (fieldValue == null) return false;
  40
  41                         try
  42                         {
  43                                 Convert.ToDecimal(fieldValue.ToString());
  44                                 return true;
  45                         }
  46                         catch(Exception)
  47                         {
  48                                 return false;
  49                         }
  50                 }
  51
  52                 /// <summary>
  53                 /// Gets a value indicating whether this validator supports web validation.
  54                 /// </summary>
  55                 /// <value>
  56                 ///     <see langword="true"/> if web validation is supported; otherwise, <see langword="false"/>.
  57                 /// </value>
  58                 public override bool SupportsWebValidation
  59                 {
  60                         get { return true; }
  61                 }
  62
  63                 /// <summary>
  64                 /// Applies the web validation by setting up one or
  65                 /// more input rules on <see cref="IWebValidationGenerator"/>.
  66                 /// </summary>
  67                 /// <param name="config">The config.</param>
  68                 /// <param name="inputType">Type of the input.</param>
  69                 /// <param name="generator">The generator.</param>
  70                 /// <param name="attributes">The attributes.</param>
  71                 /// <param name="target">The target.</param>
  72                 public override void ApplyWebValidation(WebValidationConfiguration config, InputElementType inputType,
  73                                                         IWebValidationGenerator generator, IDictionary attributes, string target)
  74                 {
  75                         base.ApplyWebValidation(config, inputType, generator, attributes, target);
  76
  77                         if (inputType == InputElementType.Text)
  78                         {
  79                                 generator.SetNumberOnly(BuildErrorMessage());
  80                         }
  81                 }
  82
  83                 /// <summary>
  84                 /// Returns the key used to internationalize error messages
  85                 /// </summary>
  86                 /// <value></value>
  87                 protected override string MessageKey
  88                 {
  89                         get { return MessageConstants.InvalidDecimalMessage; }
  90                 }
  91         }
  92 }