InversionOfControl/Castle.MicroKernel/Handlers/DefaultHandler.cs

   1 // Copyright 2004-2008 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.MicroKernel.Handlers
  16 {
  17         using System;
  18
  19         using Castle.Core;
  20         using System.Collections;
  21
  22         /// <summary>
  23         /// Summary description for DefaultHandler.
  24         /// </summary>
  25         [Serializable]
  26         public class DefaultHandler : AbstractHandler
  27         {
  28                 /// <summary>
  29                 /// Initializes a new instance of the <see cref="DefaultHandler"/> class.
  30                 /// </summary>
  31                 /// <param name="model"></param>
  32                 public DefaultHandler(ComponentModel model) : base(model)
  33                 {
  34                 }
  35
  36                 /// <summary>
  37                 /// Returns an instance of the component this handler
  38                 /// is responsible for
  39                 /// </summary>
  40                 /// <param name="context"></param>
  41                 /// <returns></returns>
  42                 public override object Resolve(CreationContext context)
  43                 {
  44                         if (!context.HasAdditionalParameters)
  45                         {
  46                                 AssertNotWaitingForDependency();
  47                         }
  48
  49                         using (context.ResolvingHandler(this))
  50                         {
  51                             return lifestyleManager.Resolve(context);
  52                         }
  53                 }
  54
  55                 /// <summary>
  56                 /// disposes the component instance (or recycle it)
  57                 /// </summary>
  58                 /// <param name="instance"></param>
  59                 public override void Release(object instance)
  60                 {
  61                         lifestyleManager.Release(instance);
  62                 }
  63
  64                 protected void AssertNotWaitingForDependency()
  65                 {
  66                         if (CurrentState == HandlerState.WaitingDependency)
  67                         {
  68                                 String message = String.Format("Can't create component '{1}' " +
  69                                         "as it has dependencies to be satisfied. {0}",
  70                                         ObtainDependencyDetails(new ArrayList()), ComponentModel.Name);
  71
  72                                 throw new HandlerException(message);
  73                         }
  74                 }
  75         }
  76 }