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 |
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5 | namespace HeuristicLab.Persistence.Core {
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6 |
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7 | public struct ParentReference {}
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8 |
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9 | class CompositeObject {
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10 |
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11 | public object Obj { get; private set; }
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12 | public List<Tag> customValues;
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13 |
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14 | public CompositeObject(object obj) {
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15 | Obj = obj;
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16 | customValues = new List<Tag>();
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17 | }
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18 |
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19 | public void AddValue(string name, object value, List<Thunk> finalFixes) {
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20 | Tag t = new Tag(name, value);
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21 | t.finalFixes = finalFixes;
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22 | customValues.Add(t);
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23 | }
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24 |
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25 | public Setter GetSetterForLastAddedValue(string name) {
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26 | Tag t = customValues[customValues.Count - 1];
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27 | return value => t.Value = value;
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28 | }
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29 | }
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30 |
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31 | public delegate void Thunk();
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32 |
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33 | public class DeSerializer {
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34 |
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35 | private readonly Dictionary<int, object> id2obj;
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36 | private readonly Dictionary<Type, object> serializerMapping;
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37 | private readonly Stack<CompositeObject> parentStack;
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38 | private readonly Dictionary<int, Type> typeIds;
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39 | private List<Thunk> finalFixes;
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40 |
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41 | public DeSerializer(
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42 | IEnumerable<TypeMapping> typeCache) {
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43 | id2obj = new Dictionary<int, object>();
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44 | parentStack = new Stack<CompositeObject>();
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45 | typeIds = new Dictionary<int, Type>();
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46 | serializerMapping = createSerializers(typeCache);
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47 | }
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48 |
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49 | private Dictionary<Type, object> createSerializers(IEnumerable<TypeMapping> typeCache) {
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50 | var serializerMapping = new Dictionary<Type, object>();
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51 | foreach (var typeMapping in typeCache) {
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52 | Type type = Type.GetType(typeMapping.TypeName);
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53 | typeIds.Add(typeMapping.Id, type);
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54 | if (typeMapping.Serializer != null) {
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55 | Type serializerType = Type.GetType(typeMapping.Serializer);
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56 | serializerMapping.Add(type, Activator.CreateInstance(serializerType, true));
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57 | }
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58 | }
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59 | return serializerMapping;
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60 | }
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61 |
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62 | public object DeSerialize(IEnumerable<ISerializationToken> tokens) {
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63 | finalFixes = new List<Thunk>();
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64 | foreach (ISerializationToken token in tokens) {
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65 | Type t = token.GetType();
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66 | if ( t == typeof(BeginToken) ) {
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67 | CompositeStartHandler((BeginToken)token);
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68 | } else if ( t == typeof(EndToken) ) {
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69 | CompositeEndHandler((EndToken) token);
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70 | } else if ( t == typeof(PrimitiveToken) ) {
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71 | PrimitiveHandler((PrimitiveToken) token);
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72 | } else if ( t == typeof(ReferenceToken) ) {
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73 | ReferenceHandler((ReferenceToken) token);
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74 | } else if (t == typeof(NullReferenceToken)) {
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75 | NullHandler((NullReferenceToken)token);
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76 | } else {
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77 | throw new ApplicationException("invalid token type");
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78 | }
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79 | }
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80 | foreach (Thunk fix in finalFixes) {
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81 | fix();
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82 | }
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83 | return parentStack.Pop().Obj;
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84 | }
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85 |
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86 | private void CompositeStartHandler(BeginToken token) {
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87 | Type type = typeIds[(int)token.TypeId];
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88 | IDecomposer decomposer = null;
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89 | if ( serializerMapping.ContainsKey(type) )
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90 | decomposer = serializerMapping[type] as IDecomposer;
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91 | if (decomposer == null)
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92 | throw new ApplicationException(String.Format(
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93 | "No suitable method for deserialization of type \"{0}\" found.",
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94 | type.VersionInvariantName()));
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95 | object instance = decomposer.CreateInstance(type);
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96 | if (instance == null)
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97 | instance = new ParentReference();
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98 | parentStack.Push(new CompositeObject(instance));
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99 | if ( token.Id != null )
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100 | id2obj.Add((int)token.Id, instance);
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101 | }
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102 |
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103 | private void CompositeEndHandler(EndToken token) {
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104 | Type type = typeIds[(int)token.TypeId];
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105 | IDecomposer decomposer = null;
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106 | if (serializerMapping.ContainsKey(type))
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107 | decomposer = serializerMapping[type] as IDecomposer;
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108 | if (decomposer == null)
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109 | throw new ApplicationException(String.Format(
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110 | "No suitable method for deserialization of type \"{0}\" found.",
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111 | type.VersionInvariantName()));
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112 | CompositeObject customComposite = (CompositeObject)parentStack.Pop();
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113 | object deserializedObject =
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114 | decomposer.Populate(customComposite.Obj, customComposite.customValues, type);
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115 | if ( token.Id != null )
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116 | id2obj[(int)token.Id] = deserializedObject;
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117 | SetValue(token.Name, deserializedObject);
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118 | }
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119 |
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120 | private void PrimitiveHandler(PrimitiveToken token) {
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121 | Type type = typeIds[(int)token.TypeId];
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122 | object value = ((IFormatter) serializerMapping[type]).Parse(token.SerialData);
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123 | if ( token.Id != null )
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124 | id2obj[(int)token.Id] = value;
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125 | SetValue(token.Name, value);
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126 | }
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127 |
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128 | private void ReferenceHandler(ReferenceToken token) {
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129 | object referredObject = id2obj[token.Id];
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130 | SetValue(token.Name, referredObject);
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131 | if (referredObject is ParentReference) {
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132 | Setter set = parentStack.Peek().GetSetterForLastAddedValue(token.Name);
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133 | finalFixes.Add(() => set(id2obj[token.Id]));
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134 | }
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135 | }
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136 |
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137 | private void NullHandler(NullReferenceToken token) {
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138 | SetValue(token.Name, null);
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139 | }
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140 |
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141 | private void SetValue(string name, object value) {
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142 | if (parentStack.Count == 0) {
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143 | parentStack.Push(new CompositeObject(value));
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144 | } else {
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145 | parentStack.Peek().AddValue(name, value, finalFixes);
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146 | }
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147 | }
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148 | }
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149 | } |
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