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270
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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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277
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8 namespace Implab.ServiceHost.Unity {
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270
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9 using static Trace<TypeResolver>;
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277
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10 public class TypeResolver {
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270
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11 readonly Dictionary<string, Type> m_cache = new Dictionary<string, Type>();
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12
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13 Regex _nsRx = new Regex(@"^\w+(\.\w+)*$", RegexOptions.Compiled);
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14 readonly LinkedList<string> m_namespases = new LinkedList<string>();
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15
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16 LinkedListNode<string> m_insertAt;
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17
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18 readonly TypeResolver m_parent;
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19
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20 public TypeResolver() : this(null) {
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21
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22 }
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23
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24 public TypeResolver(TypeResolver parent) {
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272
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25 m_parent = parent;
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270
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26 m_insertAt = new LinkedListNode<string>(string.Empty);
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27 m_namespases.AddFirst(m_insertAt);
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28 }
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29
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30 public void AddNamespace(string ns) {
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31 Safe.ArgumentMatch(ns, nameof(ns), _nsRx);
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32 if (m_insertAt != null)
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33 m_namespases.AddAfter(m_insertAt, ns);
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34 else
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35 m_namespases.AddFirst(ns);
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36 }
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37
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38 public void AddMapping(string typeName, Type type) {
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39 Safe.ArgumentNotEmpty(typeName, nameof(typeName));
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40 Safe.ArgumentNotNull(type, nameof(type));
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41
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42 m_cache[typeName] = type;
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43 }
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44
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45 public Type Resolve(TypeReference reference) {
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46 var args = reference.IsGeneric && !reference.IsOpenGeneric ? reference.GenericParameters?.Select(Resolve).ToArray() : null;
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47 var argc = reference.IsGeneric ? reference.GenericParameters.Length : 0;
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48
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49 Type resolved;
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277
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50 if (!m_cache.TryGetValue(reference.ToString(), out resolved)) {
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270
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51 resolved = ResolveInternal(reference, args, argc);
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52 if (resolved == null)
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53 throw new Exception($"Failed to resolve {reference}");
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54 m_cache[reference.ToString()] = resolved;
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55 }
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56
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57 return resolved;
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58 }
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59
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272
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60 public Type Resolve(string typeSpec) {
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61 return Resolve(TypeReference.Parse(typeSpec));
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62 }
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63
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270
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64 Type ResolveInternal(TypeReference reference, Type[] args, int argc) {
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65 var resolved = ProbeInNamespaces(
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277
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66 String.Join(".", new[] { reference.Namespace, reference.TypeName }.Where(x => !string.IsNullOrEmpty(x))),
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67 args,
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68 argc,
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69 reference.IsArray,
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70 reference.ToString()
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71 );
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72
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73 if (resolved == null && m_parent != null)
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277
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74 resolved = m_parent.ResolveInternal(reference, args, argc);
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75
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270
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76 return resolved;
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77 }
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78
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79 public Type ProbeInNamespaces(string localName, Type[] args, int argc, bool isArray, string referenceName) {
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80 foreach (var ns in m_namespases) {
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277
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81 var typeName = FormatName(new[] { ns, localName }, argc);
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270
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82
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83 var resolved = Probe(typeName);
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84 if (resolved != null) {
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277
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85 if (args != null && args.Length > 0) {
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86 resolved = resolved.MakeGenericType(args);
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87 }
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88
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89 if (isArray)
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90 resolved = resolved.MakeArrayType();
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91
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270
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92 Log("Probe succeed {0} in '{1}': {2} -> {3}", referenceName, ns, typeName, resolved.AssemblyQualifiedName);
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93 return resolved;
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94 } else {
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95 Log("Probe failed {0} in '{1}': {2}", referenceName, ns, typeName);
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96 }
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97 }
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98
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99 return null;
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100 }
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101
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102 Type Probe(string typeName) {
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103 var assemblies = AppDomain.CurrentDomain.GetAssemblies();
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104
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277
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105 foreach (var assembly in assemblies) {
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270
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106 var type = assembly.GetType(typeName);
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107 if (type != null)
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108 return type;
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109 }
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110 return null;
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111 }
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112
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277
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113 string FormatName(string[] parts, int argc) {
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270
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114 var builder = new StringBuilder();
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277
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115
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270
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116 builder.Append(String.Join(".", parts.Where(x => !string.IsNullOrEmpty(x))));
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117 if (argc > 0) {
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118 builder.Append('`');
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119 builder.Append(argc);
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120 }
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121
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277
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122 return builder.ToString();
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270
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123 }
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124 }
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125 } |
