Facilities/Logging/Castle.Facilities.Logging/LoggerResolver.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.Facilities.Logging
  16 {
  17         using System;
  18         using Castle.Core;
  19         using Castle.Core.Logging;
  20         using Castle.MicroKernel;
  21
  22         /// <summary>
  23         /// Custom resolver used by the MicroKernel. It gives
  24         /// us some contextual information that we use to set up a logging
  25         /// before satisfying the dependency
  26         /// </summary>
  27         public class LoggerResolver : ISubDependencyResolver
  28         {
  29                 private ILoggerFactory loggerFactory;
  30                 private IExtendedLoggerFactory extendedLoggerFactory;
  31
  32                 public LoggerResolver(ILoggerFactory loggerFactory)
  33                 {
  34                         if (loggerFactory == null) throw new ArgumentNullException("loggerFactory");
  35
  36                         this.loggerFactory = loggerFactory;
  37                 }
  38
  39                 public LoggerResolver(IExtendedLoggerFactory extendedLoggerFactory)
  40                 {
  41                         if (extendedLoggerFactory == null) throw new ArgumentNullException("extendedLoggerFactory");
  42
  43                         this.extendedLoggerFactory = extendedLoggerFactory;
  44                 }
  45
  46                 public object Resolve(CreationContext context, ISubDependencyResolver parentResolver, ComponentModel model,
  47                                       DependencyModel dependency)
  48                 {
  49                         if (CanResolve(context, parentResolver, model, dependency))
  50                         {
  51                                 if (extendedLoggerFactory != null)
  52         {
  53                 return extendedLoggerFactory.Create(model.Implementation);
  54         }
  55                                 else if (loggerFactory != null)
  56                                 {
  57                                         return loggerFactory.Create(model.Implementation);
  58                                 }
  59                                 else
  60                                 {
  61                                         throw new LoggerException("Unable to resolve proper LoggerFactory for Logger.");
  62                                 }
  63                         }
  64
  65                         return null;
  66                 }
  67
  68                 public bool CanResolve(CreationContext context, ISubDependencyResolver parentResolver, ComponentModel model,
  69                                        DependencyModel dependency)
  70                 {
  71                         return dependency.TargetType == typeof(ILogger) || dependency.TargetType == typeof(IExtendedLogger);
  72                 }
  73         }
  74 }