Components/General/Validator/Castle.Components.Validator/Validators/CollectionNotEmptyValidator.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.Collections;
  18
  19         /// <summary>
  20         /// Validates that the content is a collection that is not empty
  21         /// </summary>
  22         public class CollectionNotEmptyValidator : AbstractValidator
  23         {
  24                 /// <summary>
  25                 /// Implementors should perform the actual validation upon
  26                 /// the property value
  27                 /// </summary>
  28                 /// <param name="instance">The target type instance</param>
  29                 /// <param name="fieldValue">The property/field value. It can be null.</param>
  30                 /// <returns>
  31                 ///     <c>true</c> if the value is accepted (has passed the validation test)
  32                 /// </returns>
  33                 public override bool IsValid(object instance, object fieldValue)
  34                 {
  35                         ICollection collection = fieldValue as ICollection;
  36                         if (collection == null)
  37                         {
  38                                 return false;
  39                         }
  40                         return collection.Count != 0;
  41                 }
  42
  43                 /// <summary>
  44                 /// Gets a value indicating whether this validator supports web validation.
  45                 /// </summary>
  46                 /// <value>
  47                 ///     <see langword="true"/> if web validation is supported; otherwise, <see langword="false"/>.
  48                 /// </value>
  49                 public override bool SupportsWebValidation
  50                 {
  51                         get { return false; }
  52                 }
  53
  54                 protected override string MessageKey
  55                 {
  56                         get { return MessageConstants.CollectionNotEmpty; }
  57                 }
  58         }
  59 }