source: trunk/sources/HeuristicLab.Persistence/3.3/Core/DeSerializer.cs @ 1567

Last change on this file since 1567 was 1567, checked in by epitzer, 12 years ago

One file per class; rename ViewOnlyFormat -> DebugStringFormat (#548)

File size: 5.4 KB
RevLine 
[1454]1using System.Collections.Generic;
2using System;
3using HeuristicLab.Persistence.Interfaces;
[1556]4using HeuristicLab.Persistence.Core.Tokens;
[1454]5
[1567]6namespace HeuristicLab.Persistence.Core { 
[1454]7
[1567]8  public class Deserializer {   
[1454]9
[1567]10    class Midwife {
[1566]11
[1567]12      public int? Id { get; private set; }
13      public bool MetaMode { get; set; }
14      public object Obj { get; private set; }
[1454]15
[1567]16      private List<Tag> metaInfo;
17      private List<Tag> customValues;
18      private Type type;
19      private IDecomposer decomposer;
[1553]20
[1567]21      public Midwife(object value) {
22        this.Obj = value;
23      }
[1566]24
[1567]25      public Midwife(Type type, IDecomposer decomposer, int? id) {
26        this.type = type;
27        this.decomposer = decomposer;
28        this.Id = id;
29        MetaMode = false;
30        metaInfo = new List<Tag>();
31        customValues = new List<Tag>();
32      }
[1454]33
[1567]34      public void CreateInstance() {
35        if (Obj != null)
36          throw new ApplicationException("object already instantiated");
37        Obj = decomposer.CreateInstance(type, metaInfo);
38      }
[1454]39
[1567]40      public void AddValue(string name, object value) {
41        if (MetaMode) {
42          metaInfo.Add(new Tag(name, value));
43        } else {
44          customValues.Add(new Tag(name, value));
45        }
[1553]46      }
[1454]47
[1567]48      public void Populate() {
49        decomposer.Populate(Obj, customValues, type);
50      }
[1553]51    }
[1454]52
53    private readonly Dictionary<int, object> id2obj;
[1553]54    private readonly Dictionary<Type, object> serializerMapping;
[1566]55    private readonly Stack<Midwife> parentStack;
[1553]56    private readonly Dictionary<int, Type> typeIds;
[1454]57
[1542]58    public Deserializer(
[1553]59      IEnumerable<TypeMapping> typeCache) {
[1454]60      id2obj = new Dictionary<int, object>();
[1553]61      parentStack = new Stack<Midwife>();
[1454]62      typeIds = new Dictionary<int, Type>();
[1542]63      serializerMapping = CreateSerializers(typeCache);
[1454]64    }
65
[1542]66    private Dictionary<Type, object> CreateSerializers(IEnumerable<TypeMapping> typeCache) {
[1454]67      var map = new Dictionary<Type, object>();
68      foreach (var typeMapping in typeCache) {
[1494]69        Type type = Type.GetType(typeMapping.TypeName, true);
[1454]70        typeIds.Add(typeMapping.Id, type);
71        if (typeMapping.Serializer != null) {
72          Type serializerType = Type.GetType(typeMapping.Serializer);
73          map.Add(type, Activator.CreateInstance(serializerType, true));
74        }
75      }
76      return map;
77    }
78
[1566]79    public object Deserialize(IEnumerable<ISerializationToken> tokens) {
[1454]80      foreach (ISerializationToken token in tokens) {
81        Type t = token.GetType();
[1566]82        if (t == typeof(BeginToken)) {
[1454]83          CompositeStartHandler((BeginToken)token);
[1566]84        } else if (t == typeof(EndToken)) {
85          CompositeEndHandler((EndToken)token);
86        } else if (t == typeof(PrimitiveToken)) {
87          PrimitiveHandler((PrimitiveToken)token);
88        } else if (t == typeof(ReferenceToken)) {
89          ReferenceHandler((ReferenceToken)token);
[1454]90        } else if (t == typeof(NullReferenceToken)) {
91          NullHandler((NullReferenceToken)token);
[1553]92        } else if (t == typeof(MetaInfoBeginToken)) {
93          MetaInfoBegin((MetaInfoBeginToken)token);
94        } else if (t == typeof(MetaInfoEndToken)) {
95          MetaInfoEnd((MetaInfoEndToken)token);
[1454]96        } else {
97          throw new ApplicationException("invalid token type");
98        }
99      }
100      return parentStack.Pop().Obj;
101    }
102
[1553]103    private void CompositeStartHandler(BeginToken token) {
[1454]104      Type type = typeIds[(int)token.TypeId];
105      IDecomposer decomposer = null;
[1566]106      if (serializerMapping.ContainsKey(type))
[1553]107        decomposer = serializerMapping[type] as IDecomposer;
[1454]108      if (decomposer == null)
109        throw new ApplicationException(String.Format(
110          "No suitable method for deserialization of type \"{0}\" found.",
111          type.VersionInvariantName()));
[1553]112      parentStack.Push(new Midwife(type, decomposer, token.Id));
[1454]113    }
114
[1553]115    private void CompositeEndHandler(EndToken token) {
[1454]116      Type type = typeIds[(int)token.TypeId];
[1553]117      Midwife midwife = parentStack.Pop();
118      midwife.Populate();
119      SetValue(token.Name, midwife.Obj);
[1454]120    }
121
[1553]122    private void PrimitiveHandler(PrimitiveToken token) {
[1454]123      Type type = typeIds[(int)token.TypeId];
[1566]124      object value = ((IFormatter)serializerMapping[type]).Parse(token.SerialData);
125      if (token.Id != null)
[1454]126        id2obj[(int)token.Id] = value;
127      SetValue(token.Name, value);
128    }
129
[1553]130    private void ReferenceHandler(ReferenceToken token) {
[1454]131      object referredObject = id2obj[token.Id];
[1553]132      SetValue(token.Name, referredObject);
[1454]133    }
134
[1553]135    private void NullHandler(NullReferenceToken token) {
[1454]136      SetValue(token.Name, null);
[1553]137    }
[1454]138
[1553]139    private void MetaInfoBegin(MetaInfoBeginToken token) {
140      parentStack.Peek().MetaMode = true;
141    }
142
143    private void MetaInfoEnd(MetaInfoEndToken token) {
[1566]144      Midwife m = parentStack.Peek();
[1553]145      m.MetaMode = false;
146      CreateInstance(m);
147    }
148
149    private void CreateInstance(Midwife m) {
150      m.CreateInstance();
151      if (m.Id != null)
[1566]152        id2obj.Add((int)m.Id, m.Obj);
[1553]153    }
154
[1454]155    private void SetValue(string name, object value) {
[1566]156      if (parentStack.Count == 0) {
[1553]157        parentStack.Push(new Midwife(value));
158      } else {
159        Midwife m = parentStack.Peek();
160        if (m.MetaMode == false && m.Obj == null)
161          CreateInstance(m);
[1566]162        m.AddValue(name, value);
[1454]163      }
164    }
165  }
166}
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