1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using System;
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23 | using System.Collections.Generic;
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24 | using System.Linq;
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25 | using System.Reflection;
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26 | using System.Reflection.Emit;
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27 | using System.Text;
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28 | using HeuristicLab.Persistence.Core;
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29 | using HeuristicLab.Persistence.Interfaces;
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30 |
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31 | namespace HeuristicLab.Persistence.Default.CompositeSerializers.Storable {
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32 |
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33 | /// <summary>
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34 | /// Intended for serialization of all custom classes. Classes should have the
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35 | /// <c>[StorableClass]</c> attribute set. The default mode is to serialize
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36 | /// members with the <c>[Storable]</c> attribute set. Alternatively the
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37 | /// storable mode can be set to <c>AllFields</c>, <c>AllProperties</c>
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38 | /// or <c>AllFieldsAndAllProperties</c>.
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39 | /// </summary>
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40 | [StorableClass]
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41 | public sealed class StorableSerializer : ICompositeSerializer {
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42 |
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43 | public StorableSerializer() {
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44 | accessorListCache = new AccessorListCache();
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45 | accessorCache = new AccessorCache();
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46 | constructorCache = new Dictionary<Type, Constructor>();
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47 | hookCache = new Dictionary<HookDesignator, List<StorableReflection.Hook>>();
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48 | }
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49 |
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50 | #region ICompositeSerializer implementation
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51 |
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52 | /// <summary>
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53 | /// Priority 200, one of the first default composite serializers to try.
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54 | /// </summary>
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55 | /// <value></value>
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56 | public int Priority {
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57 | get { return 200; }
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58 | }
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59 |
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60 | /// <summary>
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61 | /// Determines for every type whether the composite serializer is applicable.
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62 | /// </summary>
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63 | /// <param name="type">The type.</param>
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64 | /// <returns>
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65 | /// <c>true</c> if this instance can serialize the specified type; otherwise, <c>false</c>.
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66 | /// </returns>
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67 | public bool CanSerialize(Type type) {
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68 | bool markedStorable = StorableReflection.HasStorableClassAttribute(type);
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69 | if (GetConstructor(type) == null)
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70 | if (markedStorable)
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71 | throw new Exception("[Storable] type has no default constructor and no [StorableConstructor]");
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72 | else
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73 | return false;
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74 | if (!StorableReflection.IsEmptyOrStorableType(type, true))
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75 | if (markedStorable)
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76 | throw new Exception("[Storable] type has non emtpy, non [Storable] base classes");
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77 | else
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78 | return false;
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79 | return true;
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80 | }
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81 |
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82 | /// <summary>
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83 | /// Give a reason if possibly why the given type cannot be serialized by this
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84 | /// ICompositeSerializer.
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85 | /// </summary>
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86 | /// <param name="type">The type.</param>
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87 | /// <returns>
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88 | /// A string justifying why type cannot be serialized.
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89 | /// </returns>
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90 | public string JustifyRejection(Type type) {
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91 | StringBuilder sb = new StringBuilder();
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92 | if (GetConstructor(type) == null)
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93 | sb.Append("class has no default constructor and no [StorableConstructor]");
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94 | if (!StorableReflection.IsEmptyOrStorableType(type, true))
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95 | sb.Append("class (or one of its bases) is not empty and not marked [Storable]; ");
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96 | return sb.ToString();
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97 | }
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98 |
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99 | /// <summary>
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100 | /// Creates the meta info.
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101 | /// </summary>
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102 | /// <param name="o">The object.</param>
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103 | /// <returns>A list of storable components.</returns>
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104 | public IEnumerable<Tag> CreateMetaInfo(object o) {
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105 | InvokeHook(HookType.BeforeSerialization, o);
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106 | return new Tag[] { };
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107 | }
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108 |
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109 | /// <summary>
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110 | /// Decompose an object into <see cref="Tag"/>s, the tag name can be null,
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111 | /// the order in which elements are generated is guaranteed to be
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112 | /// the same as they will be supplied to the Populate method.
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113 | /// </summary>
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114 | /// <param name="obj">An object.</param>
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115 | /// <returns>An enumerable of <see cref="Tag"/>s.</returns>
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116 | public IEnumerable<Tag> Decompose(object obj) {
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117 | foreach (var accessor in GetStorableAccessors(obj.GetType())) {
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118 | yield return new Tag(accessor.Name, accessor.Get(obj));
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119 | }
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120 | }
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121 |
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122 | /// <summary>
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123 | /// Create an instance of the object using the provided meta information.
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124 | /// </summary>
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125 | /// <param name="type">A type.</param>
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126 | /// <param name="metaInfo">The meta information.</param>
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127 | /// <returns>A fresh instance of the provided type.</returns>
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128 | public object CreateInstance(Type type, IEnumerable<Tag> metaInfo) {
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129 | try {
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130 | return GetConstructor(type)();
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131 | } catch (TargetInvocationException x) {
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132 | throw new PersistenceException(
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133 | "Could not instantiate storable object: Encountered exception during constructor call",
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134 | x.InnerException);
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135 | }
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136 | }
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137 |
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138 | /// <summary>
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139 | /// Populates the specified instance.
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140 | /// </summary>
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141 | /// <param name="instance">The instance.</param>
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142 | /// <param name="objects">The objects.</param>
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143 | /// <param name="type">The type.</param>
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144 | public void Populate(object instance, IEnumerable<Tag> objects, Type type) {
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145 | var memberDict = new Dictionary<string, Tag>();
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146 | IEnumerator<Tag> iter = objects.GetEnumerator();
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147 | while (iter.MoveNext()) {
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148 | memberDict.Add(iter.Current.Name, iter.Current);
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149 | }
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150 | foreach (var accessor in GetStorableAccessors(instance.GetType())) {
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151 | if (memberDict.ContainsKey(accessor.Name)) {
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152 | accessor.Set(instance, memberDict[accessor.Name].Value);
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153 | } else if (accessor.DefaultValue != null) {
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154 | accessor.Set(instance, accessor.DefaultValue);
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155 | }
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156 | }
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157 | InvokeHook(HookType.AfterDeserialization, instance);
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158 | }
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159 |
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160 | #endregion
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161 |
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162 | #region constants & private data types
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163 |
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164 | private const BindingFlags ALL_CONSTRUCTORS =
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165 | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
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166 |
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167 | private static readonly object[] emptyArgs = new object[] { };
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168 | private static readonly object[] trueArgs = new object[] { true };
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169 |
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170 | private sealed class HookDesignator {
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171 | public Type Type { get; private set; }
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172 | public HookType HookType { get; private set; }
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173 | public HookDesignator() { }
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174 | public HookDesignator(Type type, HookType hookType) {
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175 | Type = type;
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176 | HookType = HookType;
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177 | }
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178 | }
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179 |
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180 | private sealed class AccessorListCache : Dictionary<Type, IEnumerable<DataMemberAccessor>> { }
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181 | private sealed class AccessorCache : Dictionary<MemberInfo, DataMemberAccessor> { }
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182 | private delegate object Constructor();
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183 |
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184 | #endregion
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185 |
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186 | #region caches
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187 |
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188 | private AccessorListCache accessorListCache;
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189 | private AccessorCache accessorCache;
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190 | private Dictionary<Type, Constructor> constructorCache;
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191 | private Dictionary<HookDesignator, List<StorableReflection.Hook>> hookCache;
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192 |
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193 | #endregion
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194 |
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195 | #region attribute access
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196 |
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197 | private IEnumerable<DataMemberAccessor> GetStorableAccessors(Type type) {
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198 | lock (accessorListCache) {
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199 | if (accessorListCache.ContainsKey(type))
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200 | return accessorListCache[type];
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201 | var storableMembers = StorableReflection
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202 | .GenerateStorableMembers(type)
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203 | .Select(mi => GetMemberAccessor(mi));
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204 | accessorListCache[type] = storableMembers;
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205 | return storableMembers;
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206 | }
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207 | }
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208 |
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209 | private DataMemberAccessor GetMemberAccessor(StorableMemberInfo mi) {
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210 | lock (accessorCache) {
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211 | if (accessorCache.ContainsKey(mi.MemberInfo))
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212 | return new DataMemberAccessor(accessorCache[mi.MemberInfo], mi.DisentangledName, mi.DefaultValue);
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213 | DataMemberAccessor dma = new DataMemberAccessor(mi.MemberInfo, mi.DisentangledName, mi.DefaultValue);
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214 | accessorCache[mi.MemberInfo] = dma;
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215 | return dma;
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216 | }
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217 | }
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218 |
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219 | private Constructor GetConstructor(Type type) {
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220 | lock (constructorCache) {
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221 | if (constructorCache.ContainsKey(type))
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222 | return constructorCache[type];
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223 | Constructor c = FindStorableConstructor(type) ?? GetDefaultConstructor(type);
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224 | constructorCache.Add(type, c);
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225 | return c;
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226 | }
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227 | }
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228 |
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229 | private Constructor GetDefaultConstructor(Type type) {
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230 | ConstructorInfo ci = type.GetConstructor(ALL_CONSTRUCTORS, null, Type.EmptyTypes, null);
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231 | if (ci == null)
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232 | return null;
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233 | DynamicMethod dm = new DynamicMethod("", typeof(object), null, type);
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234 | ILGenerator ilgen = dm.GetILGenerator();
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235 | ilgen.Emit(OpCodes.Newobj, ci);
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236 | ilgen.Emit(OpCodes.Ret);
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237 | return (Constructor)dm.CreateDelegate(typeof(Constructor));
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238 | }
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239 |
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240 | private Constructor FindStorableConstructor(Type type) {
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241 | foreach (ConstructorInfo ci in type.GetConstructors(ALL_CONSTRUCTORS)) {
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242 | if (ci.GetCustomAttributes(typeof(StorableConstructorAttribute), false).Length > 0) {
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243 | if (ci.GetParameters().Length != 1 ||
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244 | ci.GetParameters()[0].ParameterType != typeof(bool))
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245 | throw new PersistenceException("StorableConstructor must have exactly one argument of type bool");
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246 | DynamicMethod dm = new DynamicMethod("", typeof(object), null, type);
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247 | ILGenerator ilgen = dm.GetILGenerator();
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248 | ilgen.Emit(OpCodes.Ldc_I4_1); // load true
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249 | ilgen.Emit(OpCodes.Newobj, ci);
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250 | ilgen.Emit(OpCodes.Ret);
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251 | return (Constructor)dm.CreateDelegate(typeof(Constructor));
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252 | }
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253 | }
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254 | return null;
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255 | }
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256 |
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257 | private void InvokeHook(HookType hookType, object obj) {
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258 | if (obj == null)
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259 | throw new ArgumentNullException("Cannot invoke hooks on null");
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260 | foreach (StorableReflection.Hook hook in GetHooks(hookType, obj.GetType())) {
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261 | hook(obj);
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262 | }
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263 | }
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264 |
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265 | private IEnumerable<StorableReflection.Hook> GetHooks(HookType hookType, Type type) {
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266 | lock (hookCache) {
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267 | List<StorableReflection.Hook> hooks;
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268 | var designator = new HookDesignator(type, hookType);
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269 | hookCache.TryGetValue(designator, out hooks);
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270 | if (hooks != null)
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271 | return hooks;
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272 | hooks = new List<StorableReflection.Hook>(StorableReflection.CollectHooks(hookType, type));
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273 | hookCache.Add(designator, hooks);
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274 | return hooks;
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275 | }
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276 | }
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277 |
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278 | #endregion
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279 |
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280 |
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281 |
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282 | }
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283 |
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284 | } |
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