1 | using System.Collections.Generic;
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2 | using System;
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3 | using HeuristicLab.Persistence.Interfaces;
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4 | using HeuristicLab.Persistence.Core.Tokens;
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5 | using HeuristicLab.Persistence.Auxiliary;
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6 | using HeuristicLab.Tracing;
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7 | using System.Reflection;
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8 |
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9 | namespace HeuristicLab.Persistence.Core {
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10 |
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11 | public class TypeLoader {
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12 |
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13 | public static Type Load(string typeNameString) {
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14 | Type type;
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15 | try {
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16 | type = Type.GetType(typeNameString, true);
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17 | } catch (Exception) {
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18 | Logger.Warn(String.Format(
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19 | "Cannot load type \"{0}\", falling back to partial name", typeNameString));
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20 | try {
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21 | TypeName typeName = TypeNameParser.Parse(typeNameString);
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22 | Assembly a = Assembly.LoadWithPartialName(typeName.AssemblyName);
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23 | type = a.GetType(typeName.ToString(false, false), true);
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24 | } catch (Exception) {
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25 | throw new PersistenceException(String.Format(
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26 | "Could not load type \"{0}\"",
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27 | typeNameString));
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28 | }
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29 | try {
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30 | TypeName requestedTypeName = TypeNameParser.Parse(typeNameString);
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31 | TypeName loadedTypeName = TypeNameParser.Parse(type.AssemblyQualifiedName);
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32 | if (!requestedTypeName.IsCompatible(loadedTypeName))
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33 | throw new PersistenceException(String.Format(
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34 | "Serialized type is incompatible with available type: serialized: {0}, loaded: {1}",
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35 | typeNameString,
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36 | type.AssemblyQualifiedName));
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37 | if (requestedTypeName.IsNewerThan(loadedTypeName))
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38 | throw new PersistenceException(String.Format(
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39 | "Serialized type is newer than available type: serialized: {0}, loaded: {1}",
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40 | typeNameString,
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41 | type.AssemblyQualifiedName));
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42 | } catch (PersistenceException) {
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43 | throw;
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44 | } catch (Exception e) {
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45 | Logger.Warn(String.Format(
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46 | "Could not perform version check requested type was {0} while loaded type is {1}:",
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47 | typeNameString,
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48 | type.AssemblyQualifiedName),
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49 | e);
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50 | }
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51 | }
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52 | return type;
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53 | }
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54 |
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55 | }
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56 |
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57 | public class Deserializer {
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58 |
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59 | class Midwife {
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60 |
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61 | public int? Id { get; private set; }
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62 | public bool MetaMode { get; set; }
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63 | public object Obj { get; private set; }
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64 |
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65 | private List<Tag> metaInfo;
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66 | private List<Tag> customValues;
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67 | private Type type;
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68 | private IDecomposer decomposer;
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69 |
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70 | public Midwife(object value) {
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71 | this.Obj = value;
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72 | }
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73 |
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74 | public Midwife(Type type, IDecomposer decomposer, int? id) {
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75 | this.type = type;
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76 | this.decomposer = decomposer;
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77 | this.Id = id;
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78 | MetaMode = false;
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79 | metaInfo = new List<Tag>();
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80 | customValues = new List<Tag>();
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81 | }
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82 |
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83 | public void CreateInstance() {
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84 | if (Obj != null)
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85 | throw new PersistenceException("object already instantiated");
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86 | Obj = decomposer.CreateInstance(type, metaInfo);
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87 | }
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88 |
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89 | public void AddValue(string name, object value) {
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90 | if (MetaMode) {
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91 | metaInfo.Add(new Tag(name, value));
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92 | } else {
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93 | customValues.Add(new Tag(name, value));
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94 | }
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95 | }
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96 |
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97 | public void Populate() {
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98 | decomposer.Populate(Obj, customValues, type);
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99 | }
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100 | }
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101 |
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102 | private readonly Dictionary<int, object> id2obj;
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103 | private readonly Dictionary<Type, object> serializerMapping;
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104 | private readonly Stack<Midwife> parentStack;
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105 | private readonly Dictionary<int, Type> typeIds;
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106 |
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107 | public Deserializer(
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108 | IEnumerable<TypeMapping> typeCache) {
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109 | id2obj = new Dictionary<int, object>();
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110 | parentStack = new Stack<Midwife>();
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111 | typeIds = new Dictionary<int, Type>();
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112 | serializerMapping = CreateSerializers(typeCache);
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113 | }
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114 |
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115 | private Dictionary<Type, object> CreateSerializers(IEnumerable<TypeMapping> typeCache) {
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116 | try {
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117 | var map = new Dictionary<Type, object>();
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118 | foreach (var typeMapping in typeCache) {
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119 | Type type = TypeLoader.Load(typeMapping.TypeName);
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120 | typeIds.Add(typeMapping.Id, type);
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121 | Type serializerType = TypeLoader.Load(typeMapping.Serializer);
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122 | map.Add(type, Activator.CreateInstance(serializerType, true));
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123 | }
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124 | return map;
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125 | } catch (PersistenceException) {
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126 | throw;
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127 | } catch (Exception e) {
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128 | throw new PersistenceException(
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129 | "The serialization type cache could not be loaded.\r\n" +
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130 | "This usualy happens when you are missing an Assembly/Plugin.", e);
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131 | }
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132 | }
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133 |
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134 |
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135 | public object Deserialize(IEnumerable<ISerializationToken> tokens) {
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136 | foreach (ISerializationToken token in tokens) {
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137 | Type t = token.GetType();
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138 | if (t == typeof(BeginToken)) {
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139 | CompositeStartHandler((BeginToken)token);
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140 | } else if (t == typeof(EndToken)) {
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141 | CompositeEndHandler((EndToken)token);
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142 | } else if (t == typeof(PrimitiveToken)) {
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143 | PrimitiveHandler((PrimitiveToken)token);
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144 | } else if (t == typeof(ReferenceToken)) {
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145 | ReferenceHandler((ReferenceToken)token);
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146 | } else if (t == typeof(NullReferenceToken)) {
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147 | NullHandler((NullReferenceToken)token);
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148 | } else if (t == typeof(MetaInfoBeginToken)) {
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149 | MetaInfoBegin((MetaInfoBeginToken)token);
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150 | } else if (t == typeof(MetaInfoEndToken)) {
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151 | MetaInfoEnd((MetaInfoEndToken)token);
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152 | } else {
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153 | throw new PersistenceException("invalid token type");
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154 | }
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155 | }
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156 | return parentStack.Pop().Obj;
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157 | }
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158 |
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159 | private void CompositeStartHandler(BeginToken token) {
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160 | Type type = typeIds[(int)token.TypeId];
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161 | IDecomposer decomposer = null;
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162 | if (serializerMapping.ContainsKey(type))
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163 | decomposer = serializerMapping[type] as IDecomposer;
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164 | if (decomposer == null)
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165 | throw new PersistenceException(String.Format(
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166 | "No suitable method for deserialization of type \"{0}\" found.",
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167 | type.VersionInvariantName()));
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168 | parentStack.Push(new Midwife(type, decomposer, token.Id));
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169 | }
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170 |
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171 | private void CompositeEndHandler(EndToken token) {
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172 | Type type = typeIds[(int)token.TypeId];
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173 | Midwife midwife = parentStack.Pop();
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174 | if (midwife.Obj == null)
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175 | CreateInstance(midwife);
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176 | midwife.Populate();
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177 | SetValue(token.Name, midwife.Obj);
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178 | }
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179 |
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180 | private void PrimitiveHandler(PrimitiveToken token) {
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181 | Type type = typeIds[(int)token.TypeId];
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182 | object value = ((IFormatter)serializerMapping[type]).Parse(token.SerialData);
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183 | if (token.Id != null)
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184 | id2obj[(int)token.Id] = value;
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185 | SetValue(token.Name, value);
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186 | }
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187 |
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188 | private void ReferenceHandler(ReferenceToken token) {
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189 | object referredObject = id2obj[token.Id];
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190 | SetValue(token.Name, referredObject);
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191 | }
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192 |
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193 | private void NullHandler(NullReferenceToken token) {
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194 | SetValue(token.Name, null);
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195 | }
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196 |
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197 | private void MetaInfoBegin(MetaInfoBeginToken token) {
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198 | parentStack.Peek().MetaMode = true;
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199 | }
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200 |
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201 | private void MetaInfoEnd(MetaInfoEndToken token) {
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202 | Midwife m = parentStack.Peek();
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203 | m.MetaMode = false;
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204 | CreateInstance(m);
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205 | }
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206 |
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207 | private void CreateInstance(Midwife m) {
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208 | m.CreateInstance();
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209 | if (m.Id != null)
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210 | id2obj.Add((int)m.Id, m.Obj);
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211 | }
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212 |
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213 | private void SetValue(string name, object value) {
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214 | if (parentStack.Count == 0) {
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215 | parentStack.Push(new Midwife(value));
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216 | } else {
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217 | Midwife m = parentStack.Peek();
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218 | if (m.MetaMode == false && m.Obj == null)
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219 | CreateInstance(m);
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220 | m.AddValue(name, value);
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221 | }
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222 | }
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223 | }
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224 | } |
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