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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4 using System.Text;
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5 using System.Text.RegularExpressions;
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6 using Implab.Diagnostics;
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7
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8 namespace Implab.ServiceHost.Unity
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9 {
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10 using static Trace<TypeResolver>;
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11 public class TypeResolver
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12 {
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13 readonly Dictionary<string, Type> m_cache = new Dictionary<string, Type>();
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14
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15 Regex _nsRx = new Regex(@"^\w+(\.\w+)*$", RegexOptions.Compiled);
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16 readonly LinkedList<string> m_namespases = new LinkedList<string>();
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17
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18 LinkedListNode<string> m_insertAt;
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19
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20 readonly TypeResolver m_parent;
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21
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22 public TypeResolver() : this(null) {
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23
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24 }
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25
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26 public TypeResolver(TypeResolver parent) {
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27 m_insertAt = new LinkedListNode<string>(string.Empty);
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28 m_namespases.AddFirst(m_insertAt);
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29 }
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30
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31 public void AddNamespace(string ns) {
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32 Safe.ArgumentMatch(ns, nameof(ns), _nsRx);
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33 if (m_insertAt != null)
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34 m_namespases.AddAfter(m_insertAt, ns);
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35 else
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36 m_namespases.AddFirst(ns);
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37 }
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38
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39 public void AddMapping(string typeName, Type type) {
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40 Safe.ArgumentNotEmpty(typeName, nameof(typeName));
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41 Safe.ArgumentNotNull(type, nameof(type));
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42
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43 m_cache[typeName] = type;
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44 }
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45
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46 public Type Resolve(TypeReference reference) {
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47 var args = reference.IsGeneric && !reference.IsOpenGeneric ? reference.GenericParameters?.Select(Resolve).ToArray() : null;
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48 var argc = reference.IsGeneric ? reference.GenericParameters.Length : 0;
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49
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50 Type resolved;
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51 if(!m_cache.TryGetValue(reference.ToString(), out resolved)) {
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52 resolved = ResolveInternal(reference, args, argc);
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53 if (resolved == null)
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54 throw new Exception($"Failed to resolve {reference}");
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55 m_cache[reference.ToString()] = resolved;
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56 }
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57
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58 return resolved;
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59 }
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60
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61 Type ResolveInternal(TypeReference reference, Type[] args, int argc) {
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62 var resolved = ProbeInNamespaces(
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63 String.Join(".", new [] { reference.Namespace, reference.TypeName }.Where(x => !string.IsNullOrEmpty(x)) ),
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64 args,
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65 argc,
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66 reference.IsArray,
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67 reference.ToString()
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68 );
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69
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70 if (resolved == null && m_parent != null)
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71 resolved = m_parent.Resolve(reference);
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72
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73 return resolved;
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74 }
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75
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76 public Type ProbeInNamespaces(string localName, Type[] args, int argc, bool isArray, string referenceName) {
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77 foreach (var ns in m_namespases) {
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78 var typeName = FormatName(new [] { ns, localName}, argc, args, isArray);
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79
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80 var resolved = Probe(typeName);
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81 if (resolved != null) {
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82 Log("Probe succeed {0} in '{1}': {2} -> {3}", referenceName, ns, typeName, resolved.AssemblyQualifiedName);
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83 return resolved;
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84 } else {
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85 Log("Probe failed {0} in '{1}': {2}", referenceName, ns, typeName);
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86 }
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87 }
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88
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89 return null;
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90 }
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91
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92 Type Probe(string typeName) {
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93 var assemblies = AppDomain.CurrentDomain.GetAssemblies();
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94
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95 foreach(var assembly in assemblies) {
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96 var type = assembly.GetType(typeName);
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97 if (type != null)
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98 return type;
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99 }
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100 return null;
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101 }
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102
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103 string FormatName(string[] parts, int argc, Type[] args, bool isArray) {
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104 var builder = new StringBuilder();
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105
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106 builder.Append(String.Join(".", parts.Where(x => !string.IsNullOrEmpty(x))));
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107 if (argc > 0) {
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108 builder.Append('`');
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109 builder.Append(argc);
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110 }
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111
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112 if (args!= null && args.Length > 0) {
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113 builder.Append('[');
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114 builder.Append(string.Join(",", args.Select(x => $"[{x.AssemblyQualifiedName}]")));
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115 builder.Append(']');
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116 }
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117
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118 if(isArray)
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119 builder.Append("[]");
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120
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121 return builder.ToString();
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122 }
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123 }
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124 } |
