MonoRail/Castle.MonoRail.Framework/Internal/RescueUtils.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.MonoRail.Framework.Internal
  16 {
  17         using System;
  18         using Descriptors;
  19
  20         static class RescueUtils
  21         {
  22                 public static RescueDescriptor SelectBest(RescueDescriptor[] rescues, Type exceptionType)
  23                 {
  24                         RescueDescriptor bestCandidate = null;
  25                         RescueDescriptor mostGenericCandidate = null;
  26
  27                         foreach(RescueDescriptor rescue in rescues)
  28                         {
  29                                 if (rescue.ExceptionType == exceptionType)
  30                                 {
  31                                         return rescue;
  32                                 }
  33                                 else if (rescue.ExceptionType != null)
  34                                 {
  35                                         if (rescue.ExceptionType == typeof(Exception))
  36                                         {
  37                                                 mostGenericCandidate = rescue;
  38                                         }
  39                                         else if (rescue.ExceptionType.IsAssignableFrom(exceptionType))
  40                                         {
  41                                                 bestCandidate = rescue;
  42                                         }
  43                                 }
  44                         }
  45
  46                         return bestCandidate ?? mostGenericCandidate;
  47                 }
  48         }
  49 }