Components/General/Validator/Castle.Components.Validator/Validators/NullableDateTimeValidator.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
  19         /// <summary>
  20         /// This is a meta validator.
  21         /// It is only useful to test a source content before setting it on the
  22         /// target instance.
  23         /// </summary>
  24         public class NullableDateTimeValidator : AbstractValidator
  25         {
  26                 /// <summary>
  27                 /// Checks if the <c>fieldValue</c> can be converted to a valid DateTime.
  28                 /// Null or empty value allowed.
  29                 /// </summary>
  30                 /// <param name="instance">The target type instance</param>
  31                 /// <param name="fieldValue">The property/field value. It can be null.</param>
  32                 /// <returns>
  33                 ///     <c>true</c> if the value is accepted (has passed the validation test)
  34                 /// </returns>
  35                 public override bool IsValid(object instance, object fieldValue)
  36                 {
  37                         if (fieldValue == null) return true;
  38
  39                         string stringValue = fieldValue.ToString();
  40
  41                         if (stringValue == String.Empty) return true;
  42
  43                         DateTime datetimeValue;
  44                         return DateTime.TryParse(stringValue, out datetimeValue);
  45                 }
  46
  47                 /// <summary>
  48                 /// Gets a value indicating whether this validator supports browser validation.
  49                 /// </summary>
  50                 /// <value>
  51                 ///     <see langword="true"/> if browser validation is supported; otherwise, <see langword="false"/>.
  52                 /// </value>
  53                 public override bool SupportsBrowserValidation
  54                 {
  55                         get { return true; }
  56                 }
  57
  58                 /// <summary>
  59                 /// Returns the key used to internationalize error messages
  60                 /// </summary>
  61                 /// <value></value>
  62                 protected override string MessageKey
  63                 {
  64                         get { return MessageConstants.InvalidDateMessage; }
  65                 }
  66         }
  67 }