1 | using System;
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2 | using HeuristicLab.Persistence.Interfaces;
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3 | using HeuristicLab.Persistence.Core;
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4 | using System.Collections.Generic;
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5 | using System.Reflection;
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6 | using System.Globalization;
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7 | using System.Text;
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8 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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9 | using HeuristicLab.Persistence.Auxiliary;
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10 |
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11 | namespace HeuristicLab.Persistence.Default.CompositeSerializers {
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12 |
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13 | [StorableClass]
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14 | internal sealed class NumberEnumerable2StringSerializer : ICompositeSerializer {
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15 |
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16 | public int Priority {
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17 | get { return 200; }
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18 | }
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19 |
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20 | private static readonly Number2StringSerializer numberConverter =
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21 | new Number2StringSerializer();
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22 |
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23 | private static readonly Dictionary<Type, Type> interfaceCache = new Dictionary<Type, Type>();
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24 |
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25 | public Type GetGenericEnumerableInterface(Type type) {
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26 | if (interfaceCache.ContainsKey(type))
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27 | return interfaceCache[type];
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28 | foreach (Type iface in type.GetInterfaces()) {
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29 | if (iface.IsGenericType &&
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30 | iface.GetGenericTypeDefinition() == typeof(IEnumerable<>) &&
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31 | numberConverter.CanSerialize(iface.GetGenericArguments()[0])) {
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32 | interfaceCache.Add(type, iface);
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33 | return iface;
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34 | }
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35 | }
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36 | interfaceCache.Add(type, null);
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37 | return null;
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38 | }
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39 |
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40 | public bool ImplementsGenericEnumerable(Type type) {
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41 | return GetGenericEnumerableInterface(type) != null;
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42 | }
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43 |
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44 | public bool HasAddMethod(Type type) {
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45 | return
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46 | type.GetMethod("Add") != null &&
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47 | type.GetMethod("Add").GetParameters().Length == 1 &&
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48 | type.GetConstructor(
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49 | BindingFlags.Public |
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50 | BindingFlags.NonPublic |
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51 | BindingFlags.Instance,
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52 | null, Type.EmptyTypes, null) != null;
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53 | }
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54 |
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55 | public bool CanSerialize(Type type) {
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56 | return
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57 | ReflectionTools.HasDefaultConstructor(type) &&
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58 | ImplementsGenericEnumerable(type) &&
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59 | HasAddMethod(type);
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60 | }
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61 |
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62 | public string JustifyRejection(Type type) {
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63 | if (!ReflectionTools.HasDefaultConstructor(type))
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64 | return "no default constructor";
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65 | if (!ImplementsGenericEnumerable(type))
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66 | return "IEnumerable<> not implemented";
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67 | return "no Add method with one parameter";
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68 | }
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69 |
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70 | public IEnumerable<Tag> CreateMetaInfo(object o) {
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71 | return new Tag[] { };
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72 | }
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73 |
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74 | public IEnumerable<Tag> Decompose(object obj) {
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75 | Type type = obj.GetType();
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76 | Type enumerable = GetGenericEnumerableInterface(type);
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77 | InterfaceMapping iMap = obj.GetType().GetInterfaceMap(enumerable);
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78 | MethodInfo getEnumeratorMethod =
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79 | iMap.TargetMethods[
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80 | Array.IndexOf(
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81 | iMap.InterfaceMethods,
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82 | enumerable.GetMethod("GetEnumerator"))];
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83 | object[] empty = new object[] { };
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84 | object genericEnumerator = getEnumeratorMethod.Invoke(obj, empty);
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85 | MethodInfo moveNextMethod = genericEnumerator.GetType().GetMethod("MoveNext");
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86 | PropertyInfo currentProperty = genericEnumerator.GetType().GetProperty("Current");
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87 | StringBuilder sb = new StringBuilder();
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88 | while ((bool)moveNextMethod.Invoke(genericEnumerator, empty))
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89 | sb.Append(
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90 | numberConverter.Format(
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91 | currentProperty.GetValue(genericEnumerator, null))).Append(';');
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92 | yield return new Tag("compact enumerable", sb.ToString());
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93 | }
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94 |
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95 | public object CreateInstance(Type type, IEnumerable<Tag> metaInfo) {
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96 | return Activator.CreateInstance(type, true);
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97 | }
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98 |
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99 | public void Populate(object instance, IEnumerable<Tag> tags, Type type) {
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100 | Type enumerable = GetGenericEnumerableInterface(type);
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101 | Type elementType = enumerable.GetGenericArguments()[0];
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102 | MethodInfo addMethod = type.GetMethod("Add");
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103 | try {
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104 | var tagEnumerator = tags.GetEnumerator();
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105 | tagEnumerator.MoveNext();
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106 | string[] stringValues = ((string)tagEnumerator.Current.Value)
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107 | .Split(new[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
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108 | foreach (var value in stringValues) {
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109 | addMethod.Invoke(instance, new[] { numberConverter.Parse(value, elementType) });
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110 | }
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111 | } catch (InvalidOperationException e) {
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112 | throw new PersistenceException("Insufficient element data to reconstruct number enumerable", e);
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113 | } catch (InvalidCastException e) {
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114 | throw new PersistenceException("Invalid element data during reconstruction of number enumerable", e);
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115 | }
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116 | }
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117 | }
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118 | } |
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