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comparison Source/Aspects/Builders/NotNullAspectBuilder.cs @ 0:f990fcb411a9

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Копия текущей версии из github
author cin
date Thu, 27 Mar 2014 21:46:09 +0400
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-1:000000000000 0:f990fcb411a9
1 using System;
2 using System.Reflection;
3 using System.Reflection.Emit;
4
5 using BLToolkit.Reflection.Emit;
6 using BLToolkit.TypeBuilder.Builders;
7
8 namespace BLToolkit.Aspects.Builders
9 {
10 public class NotNullAspectBuilder : AbstractTypeBuilderBase
11 {
12 public NotNullAspectBuilder(string message)
13 {
14 _message = message;
15 }
16
17 private readonly string _message;
18
19 public override int GetPriority(BuildContext context)
20 {
21 return TypeBuilderConsts.Priority.NotNullAspect;
22 }
23
24 public override bool IsApplied(BuildContext context, AbstractTypeBuilderList builders)
25 {
26 if (context == null) throw new ArgumentNullException("context");
27
28 return context.IsBeforeStep && context.BuildElement != BuildElement.Type;
29 }
30
31 public override void Build(BuildContext context)
32 {
33 if (context == null) throw new ArgumentNullException("context");
34
35 ParameterInfo pi = (ParameterInfo)TargetElement;
36
37 if (pi.ParameterType.IsValueType == false)
38 {
39 EmitHelper emit = context.MethodBuilder.Emitter;
40 Label label = emit.DefineLabel();
41
42 string message = _message != null? string.Format(_message, pi.Name): string.Empty;
43
44 emit
45 .ldarg (pi)
46 .brtrue_s (label)
47 ;
48
49 if (string.IsNullOrEmpty(message))
50 {
51 emit
52 .ldstr (pi.Name)
53 .newobj (typeof(ArgumentNullException), typeof(string))
54 ;
55 }
56 else
57 {
58 emit
59 .ldnull
60 .ldstr (message)
61 .newobj (typeof(ArgumentNullException), typeof(string), typeof(string))
62 ;
63 }
64
65 emit
66 .@throw
67 .MarkLabel (label)
68 ;
69 }
70 }
71 }
72 }