[1280] | 1 | using System.Collections.Generic;
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| 2 | using System;
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[1332] | 3 |
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[1348] | 4 | namespace Persistence {
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| 5 |
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[1280] | 6 | public class DeSerializer {
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| 7 |
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[1331] | 8 | struct ParentReference { }
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[1281] | 9 |
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| 10 | delegate void Setter(object value);
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| 11 |
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[1280] | 12 | interface IAccessibleObject {
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[1281] | 13 | object Obj { get; }
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| 14 | Setter GetSetter(string name);
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[1280] | 15 | }
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| 16 |
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| 17 | class CustomObject : IAccessibleObject {
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[1329] | 18 | public object Obj { get; private set; }
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| 19 | public readonly List<object> customValues;
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[1280] | 20 | public CustomObject(object obj) {
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[1329] | 21 | Obj = obj;
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| 22 | customValues = new List<object>();
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[1280] | 23 | }
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| 24 | public void AddValue(object value) {
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| 25 | customValues.Add(value);
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| 26 | }
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[1281] | 27 | public Setter GetSetter(string name) {
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| 28 | int index = customValues.Count-1;
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[1329] | 29 | return value => customValues[index] = value;
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[1281] | 30 | }
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[1280] | 31 | }
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| 32 |
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| 33 | class CompositeObject : IAccessibleObject {
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[1329] | 34 | public object Obj { get; private set; }
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| 35 | public readonly Dictionary<string, DataMemberAccessor> accessorDict;
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[1280] | 36 | public CompositeObject(object obj, Dictionary<string, DataMemberAccessor> accessorDict) {
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[1329] | 37 | Obj = obj;
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[1280] | 38 | this.accessorDict = new Dictionary<string, DataMemberAccessor>();
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| 39 | foreach (KeyValuePair<string, DataMemberAccessor> pair in accessorDict) {
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| 40 | this.accessorDict.Add(
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| 41 | pair.Value.Name,
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| 42 | pair.Value);
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| 43 | }
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| 44 | }
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| 45 | public void SetValue(string name, object value) {
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| 46 | accessorDict[name].Set(value);
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[1336] | 47 | accessorDict.Remove(name);
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[1280] | 48 | }
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[1281] | 49 | public Setter GetSetter(string name) {
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[1329] | 50 | return value => accessorDict[name].Set(value);
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[1281] | 51 | }
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[1336] | 52 | public void PopulateDefaultValues() {
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| 53 | foreach (var pair in accessorDict) {
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| 54 | pair.Value.Set(pair.Value.DefaultValue);
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| 55 | }
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| 56 | }
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[1280] | 57 | }
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| 58 |
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[1356] | 59 | private delegate void Handler(ISerializationToken token);
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[1280] | 60 |
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[1329] | 61 | private readonly Dictionary<int, object> id2obj;
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| 62 | private readonly Dictionary<Type, Handler> handlers;
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| 63 | private readonly Stack<IAccessibleObject> compositeStack;
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[1349] | 64 | private readonly PersistenceConfiguration persistenceConfiguration;
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[1355] | 65 | private readonly Dictionary<int, Type> typeIds;
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[1280] | 66 |
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[1281] | 67 | delegate void Thunk();
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| 68 | private List<Thunk> finalFixes;
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| 69 |
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[1355] | 70 | public DeSerializer(
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| 71 | IEnumerable<KeyValuePair<string, int>> typeCache,
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| 72 | PersistenceConfiguration persistenceConfiguration) {
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[1349] | 73 | this.persistenceConfiguration = persistenceConfiguration;
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[1280] | 74 | id2obj = new Dictionary<int, object>();
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| 75 | compositeStack = new Stack<IAccessibleObject>();
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[1329] | 76 | handlers = new Dictionary<Type, Handler> {
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[1356] | 77 | {typeof (BeginToken), CompositeStartHandler},
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| 78 | {typeof (EndToken), CompositeEndHandler},
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| 79 | {typeof (PrimitiveToken), PrimitiveHandler},
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| 80 | {typeof (ReferenceToken), ReferenceHandler},
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| 81 | {typeof (NullReferenceToken), NullHandler}
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[1349] | 82 | };
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[1355] | 83 | typeIds = new Dictionary<int, Type>();
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| 84 | foreach ( var pair in typeCache ) {
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| 85 | Type type = Type.GetType(pair.Key);
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| 86 | typeIds.Add(pair.Value, type);
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| 87 | }
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[1281] | 88 | }
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[1280] | 89 |
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[1356] | 90 | public object DeSerialize(IEnumerable<ISerializationToken> tokens) {
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[1329] | 91 | finalFixes = new List<Thunk>();
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[1356] | 92 | foreach (ISerializationToken token in tokens) {
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[1280] | 93 | handlers[token.GetType()].Invoke(token);
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| 94 | }
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[1329] | 95 | foreach (Thunk fix in finalFixes) {
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[1281] | 96 | fix();
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| 97 | }
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[1280] | 98 | return compositeStack.Pop().Obj;
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| 99 | }
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[1318] | 100 |
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[1356] | 101 | private void CompositeStartHandler(ISerializationToken token) {
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| 102 | BeginToken start = (BeginToken)token;
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| 103 | object instance;
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| 104 | Type type = typeIds[(int)start.TypeId];
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[1355] | 105 | if (persistenceConfiguration.GetDecomposer(type) != null) {
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[1281] | 106 | instance = new ParentReference();
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[1339] | 107 | compositeStack.Push(new CustomObject(instance));
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[1332] | 108 | } else {
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[1355] | 109 | instance = Activator.CreateInstance(type, true);
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[1280] | 110 | Dictionary<string, DataMemberAccessor> accessorDict =
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[1336] | 111 | StorableAttribute.GetAutostorableAccessors(instance);
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[1339] | 112 | compositeStack.Push(new CompositeObject(instance, accessorDict));
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[1280] | 113 | }
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[1339] | 114 | if ( start.Id != null )
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| 115 | id2obj.Add((int)start.Id, instance);
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[1280] | 116 | }
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[1356] | 117 | private void CompositeEndHandler(ISerializationToken token) {
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| 118 | EndToken end = (EndToken)token;
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| 119 | Type type = typeIds[(int)end.TypeId];
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[1355] | 120 | IDecomposer decomposer = persistenceConfiguration.GetDecomposer(type);
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[1348] | 121 | if (decomposer != null) {
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[1280] | 122 | CustomObject customObject = (CustomObject)compositeStack.Pop();
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[1281] | 123 | object deserializedObject =
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[1355] | 124 | decomposer.DeSerialize(customObject.customValues, type);
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[1339] | 125 | if ( end.Id != null )
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| 126 | id2obj[(int)end.Id] = deserializedObject;
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[1329] | 127 | SetValue(end.Name, deserializedObject);
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[1280] | 128 | } else {
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| 129 | CompositeObject compositeObject = (CompositeObject)compositeStack.Pop();
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[1336] | 130 | compositeObject.PopulateDefaultValues();
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[1329] | 131 | SetValue(end.Name, compositeObject.Obj);
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[1280] | 132 | }
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[1356] | 133 | }
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| 134 | private void PrimitiveHandler(ISerializationToken token) {
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| 135 | PrimitiveToken primitive = (PrimitiveToken)token;
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| 136 | Type type = typeIds[(int)primitive.TypeId];
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[1349] | 137 | object value = persistenceConfiguration
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[1355] | 138 | .GetFormatter(XmlFormat.Instance, type)
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[1356] | 139 | .DeSerialize(primitive.SerialData);
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[1330] | 140 | if ( ! value.GetType().IsValueType )
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| 141 | id2obj[(int)primitive.Id] = value;
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| 142 | SetValue(primitive.Name, value);
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[1280] | 143 | }
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[1356] | 144 | private void ReferenceHandler(ISerializationToken token) {
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| 145 | ReferenceToken reference = (ReferenceToken)token;
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[1329] | 146 | object referredObject = id2obj[reference.Id];
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| 147 | SetValue(reference.Name, id2obj[reference.Id]);
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[1281] | 148 | if (referredObject is ParentReference) {
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| 149 | Setter set = compositeStack.Peek().GetSetter(reference.Name);
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| 150 | int id = reference.Id;
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[1329] | 151 | finalFixes.Add(() => set(id2obj[id]));
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[1281] | 152 | }
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[1280] | 153 | }
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[1356] | 154 | private void NullHandler(ISerializationToken token) {
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| 155 | NullReferenceToken nil = (NullReferenceToken)token;
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[1329] | 156 | SetValue(nil.Name, null);
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[1280] | 157 | }
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| 158 | private void SetValue(string name, object value) {
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| 159 | if (compositeStack.Count == 0) {
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| 160 | compositeStack.Push(new CompositeObject(value, new Dictionary<string, DataMemberAccessor>()));
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| 161 | } else {
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| 162 | object accessibleObject = compositeStack.Peek();
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| 163 | if (accessibleObject is CompositeObject) {
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| 164 | ((CompositeObject)accessibleObject).SetValue(name, value);
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| 165 | } else if (accessibleObject is CustomObject) {
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| 166 | ((CustomObject)accessibleObject).AddValue(value);
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| 167 | }
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| 168 | }
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| 169 | }
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| 170 | }
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| 171 | } |
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