Tools/Castle.DynamicProxy2/Castle.DynamicProxy/Generators/Emitters/SimpleAST/NewInstanceExpression.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.Generators.Emitters.SimpleAST
  16 {
  17         using System;
  18         using System.Reflection;
  19         using System.Reflection.Emit;
  20
  21         public class NewInstanceExpression : Expression
  22         {
  23                 private Type type;
  24                 private Type[] constructor_args;
  25                 private Expression[] arguments;
  26                 private ConstructorInfo constructor;
  27
  28                 public NewInstanceExpression(ConstructorInfo constructor, params Expression[] args)
  29                 {
  30                         this.constructor = constructor;
  31                         arguments = args;
  32                 }
  33
  34                 public NewInstanceExpression(Type target, Type[] constructor_args, params Expression[] args)
  35                 {
  36                         type = target;
  37                         this.constructor_args = constructor_args;
  38                         arguments = args;
  39                 }
  40
  41                 public override void Emit(IMemberEmitter member, ILGenerator gen)
  42                 {
  43                         foreach(Expression exp in arguments)
  44                         {
  45                                 exp.Emit(member, gen);
  46                         }
  47
  48                         if (constructor == null)
  49                         {
  50                                 constructor = type.GetConstructor(constructor_args);
  51                         }
  52
  53                         if (constructor == null)
  54                         {
  55                                 throw new ApplicationException("Could not find constructor matching specified arguments");
  56                         }
  57
  58                         gen.Emit(OpCodes.Newobj, constructor);
  59                 }
  60         }
  61 }