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source: trunk/sources/HeuristicLab.Persistence/3.3/Default/CompositeSerializers/DictionarySerializer.cs @ 2115

Last change on this file since 2115 was 1823, checked in by epitzer, 16 years ago

Namespace refactoring: rename formatters & decomposers -> primitive and composite serializers. (#603)

File size: 2.1 KB
Line 
1using System;
2using System.Collections;
3using HeuristicLab.Persistence.Core;
4using HeuristicLab.Persistence.Interfaces;
5using System.Collections.Generic;
6using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
7using HeuristicLab.Persistence.Auxiliary;
8
9namespace HeuristicLab.Persistence.Default.CompositeSerializers {
10
11  [EmptyStorableClass]
12  public class DictionarySerializer : ICompositeSerializer {
13
14    public int Priority {
15      get { return 100; }
16    }
17
18
19    public bool CanSerialize(Type type) {
20      return ReflectionTools.HasDefaultConstructor(type) &&
21        type.GetInterface(typeof(IDictionary).FullName) != null;
22    }
23
24    public IEnumerable<Tag> CreateMetaInfo(object o) {
25      return new Tag[] { };
26    }
27
28    public IEnumerable<Tag> Decompose(object o) {
29      IDictionary dict = (IDictionary)o;
30      foreach (DictionaryEntry entry in dict) {
31        yield return new Tag("key", entry.Key);
32        yield return new Tag("value", entry.Value);
33      }
34    }
35
36    public object CreateInstance(Type t, IEnumerable<Tag> metaInfo) {
37      return Activator.CreateInstance(t, true);
38    }
39
40    public void Populate(object instance, IEnumerable<Tag> o, Type t) {
41      IDictionary dict = (IDictionary)instance;
42      IEnumerator<Tag> iter = o.GetEnumerator();
43      try {
44        while (iter.MoveNext()) {
45          Tag key = iter.Current;
46          iter.MoveNext();
47          Tag value = iter.Current;
48          dict.Add(key.Value, value.Value);
49        }
50      } catch (InvalidOperationException e) {
51        throw new PersistenceException("Dictionaries must contain an even number of elements (key+value).", e);
52      } catch (NotSupportedException e) {
53        throw new PersistenceException("The serialized dictionary type was read-only or had a fixed size and cannot be deserialized.", e);
54      } catch (ArgumentNullException e) {
55        throw new PersistenceException("Dictionary key was null.", e);
56      } catch (ArgumentException e) {
57        throw new PersistenceException("Duplicate dictionary key.", e);
58      }
59    }
60  }
61
62}
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