Tools/DynamicProxy/Castle.DynamicProxy/AssertUtil.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.DynamicProxy
  16 {
  17         using System;
  18         using System.Reflection;
  19
  20         /// <summary>
  21         /// Summary description for AssertUtil.
  22         /// </summary>
  23         internal abstract class AssertUtil
  24         {
  25                 public static void NotNull(object argument, String argumentName)
  26                 {
  27                         if (argument == null)
  28                         {
  29                                 String message = String.Format("Argument '{0}' can't be null", argumentName);
  30                                 throw new ArgumentNullException(message);
  31                         }
  32                 }
  33
  34                 public static void IsInterface(Type type, String argumentName)
  35                 {
  36                         NotNull(type, argumentName);
  37
  38                         if (!type.IsInterface)
  39                         {
  40                                 String message = String.Format("Argument '{0}' must be an interface", argumentName);
  41                                 throw new ArgumentException(message);
  42                         }
  43                 }
  44
  45                 public static void IsInterface(Type[] types, String argumentName)
  46                 {
  47                         NotNull(types, argumentName);
  48
  49                         foreach (Type type in types)
  50                         {
  51                                 IsInterface(type, argumentName);
  52                         }
  53                 }
  54
  55                 public static void IsClass(Type type, String argumentName, bool checkAbstract)
  56                 {
  57                         NotNull(type, argumentName);
  58
  59                         if (!type.IsClass || type.IsAbstract && checkAbstract)
  60                         {
  61                                 bool hasAbstractMembers = false;
  62
  63                                 if (type.IsAbstract)
  64                                 {
  65                                         MethodInfo[] abstractMethods =
  66                                                 type.GetMethods(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
  67
  68                                         foreach (MethodInfo methodInfo in abstractMethods)
  69                                         {
  70                                                 if (methodInfo.IsAbstract)
  71                                                 {
  72                                                         hasAbstractMembers = true;
  73                                                         break;
  74                                                 }
  75                                         }
  76                                 }
  77
  78                                 if (!hasAbstractMembers)
  79                                 {
  80                                         // class can be used as a base
  81                                         // class even if it's abstract
  82                                         return;
  83                                 }
  84
  85                                 String message = String.Format("Argument '{0}' must be a concrete class", argumentName);
  86
  87                                 throw new ArgumentException(message);
  88                         }
  89                 }
  90         }
  91 }