Components/General/Validator/Castle.Components.Validator/CachedValidationRegistry.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         using System.Reflection;
  20
  21         /// <summary>
  22         /// <see cref="IValidatorRegistry"/> implementation that
  23         /// caches the reflection and custom attributes calls for better performance.
  24         /// </summary>
  25         public class CachedValidationRegistry : IValidatorRegistry
  26         {
  27                 private readonly IDictionary propertiesPerType = Hashtable.Synchronized(new Hashtable());
  28                 private readonly IDictionary attrsPerProperty = Hashtable.Synchronized(new Hashtable());
  29
  30                 #region IValidatorRegistry Members
  31
  32         /// <summary>
  33         /// Gets all validators associated with a <see cref="Type"/>.
  34         /// <para>
  35         /// The validators returned are initialized.
  36         /// </para>
  37         /// </summary>
  38         /// <param name="validatorRunner">The validator runner.</param>
  39         /// <param name="targetType">Target type.</param>
  40         /// <param name="runWhen">Restrict the set returned to the phase specified</param>
  41         /// <returns>A Validator array</returns>
  42                 public IValidator[] GetValidators(ValidatorRunner validatorRunner, Type targetType, RunWhen runWhen)
  43                 {
  44                         PropertyInfo[] properties = (PropertyInfo[]) propertiesPerType[targetType];
  45
  46                         if (properties == null)
  47                         {
  48                                 properties = targetType.GetProperties();
  49                                 propertiesPerType[targetType] = properties;
  50                         }
  51
  52                         ArrayList list = new ArrayList();
  53
  54                         foreach(PropertyInfo prop in properties)
  55                         {
  56                                 list.AddRange(GetValidators(validatorRunner, targetType, prop, runWhen));
  57                         }
  58
  59                         return (IValidator[]) list.ToArray(typeof(IValidator));
  60                 }
  61
  62         /// <summary>
  63         /// Gets all validators associated with a property.
  64         /// <para>
  65         /// The validators returned are initialized.
  66         /// </para>
  67         /// </summary>
  68         /// <param name="validatorRunner">The validator runner.</param>
  69         /// <param name="targetType">Target type.</param>
  70         /// <param name="property">The property.</param>
  71         /// <param name="runWhen">Restrict the set returned to the phase specified</param>
  72         /// <returns>A Validator array</returns>
  73         public IValidator[] GetValidators(ValidatorRunner validatorRunner, Type targetType, PropertyInfo property, RunWhen runWhen)
  74                 {
  75                         object[] builders = (object[]) attrsPerProperty[property];
  76
  77                         if (builders == null)
  78                         {
  79                                 builders = property.GetCustomAttributes(typeof(IValidatorBuilder), true);
  80                                 attrsPerProperty[property] = builders;
  81                         }
  82
  83                         ArrayList validators = new ArrayList();
  84
  85                         foreach(IValidatorBuilder builder in builders)
  86                         {
  87                                 IValidator validator = builder.Build(validatorRunner, targetType);
  88
  89                                 if (!IsValidatorOnPhase(validator, runWhen)) continue;
  90
  91                                 validator.Initialize(property);
  92                                 validators.Add(validator);
  93                         }
  94
  95                         return (IValidator[]) validators.ToArray(typeof(IValidator));
  96                 }
  97
  98                 #endregion
  99
 100                 private static bool IsValidatorOnPhase(IValidator validator, RunWhen when)
 101                 {
 102                         if (validator.RunWhen == RunWhen.Everytime) return true;
 103
 104                         return ((validator.RunWhen & when) != 0);
 105                 }
 106         }
 107 }