Exemplo n.º 1
0
        private static object ReadValue(Type inst_type, JsonReader reader)
        {
            reader.Read();

            if (reader.Token == JsonToken.ArrayEnd)
            {
                return(null);
            }

            Type underlying_type = Nullable.GetUnderlyingType(inst_type);
            Type value_type      = underlying_type ?? inst_type;

            if (reader.Token == JsonToken.Null)
            {
                if (inst_type.IsClass || underlying_type != null)
                {
                    return(null);
                }

                throw new JsonException(String.Format(
                                            "Can't assign null to an instance of type {0}",
                                            inst_type));
            }

            if (reader.Token == JsonToken.Double ||
                reader.Token == JsonToken.Int ||
                reader.Token == JsonToken.Long ||
                reader.Token == JsonToken.String ||
                reader.Token == JsonToken.Boolean)
            {
                Type json_type = reader.Value.GetType();

                if (value_type.IsAssignableFrom(json_type))
                {
                    return(reader.Value);
                }

                // Maybe there's a base importer that works
                if (base_importers_table.ContainsKey(json_type) &&
                    base_importers_table[json_type].ContainsKey(
                        value_type))
                {
                    ImporterFunc importer =
                        base_importers_table[json_type][value_type];

                    return(importer(reader.Value));
                }

                // Maybe it's an enum

                if (value_type.IsEnum)
                {
                    return(Enum.ToObject(value_type, reader.Value));
                }
                // Try using an implicit conversion operator
                MethodInfo conv_op = GetConvOp(value_type, json_type);

                if (conv_op != null)
                {
                    return(conv_op.Invoke(null,
                                          new object[] { reader.Value }));
                }

                // No luck
                throw new JsonException(String.Format(
                                            "Can't assign value '{0}' (type {1}) to type {2}",
                                            reader.Value, json_type, inst_type));
            }

            object instance = null;

            if (reader.Token == JsonToken.ArrayStart)
            {
                AddArrayMetadata(inst_type);
                ArrayMetadata t_data = array_metadata[inst_type];

                if (!t_data.IsArray && !t_data.IsList)
                {
                    throw new JsonException(String.Format(
                                                "Type {0} can't act as an array",
                                                inst_type));
                }

                IList list;
                Type  elem_type;

                if (!t_data.IsArray)
                {
                    list      = (IList)Activator.CreateInstance(inst_type);
                    elem_type = t_data.ElementType;
                }
                else
                {
                    list      = new ArrayList();
                    elem_type = inst_type.GetElementType();
                }

                while (true)
                {
                    object item = ReadValue(elem_type, reader);
                    if (item == null && reader.Token == JsonToken.ArrayEnd)
                    {
                        break;
                    }

                    list.Add(item);
                }

                if (t_data.IsArray)
                {
                    int n = list.Count;
                    instance = Array.CreateInstance(elem_type, n);

                    for (int i = 0; i < n; i++)
                    {
                        ((Array)instance).SetValue(list[i], i);
                    }
                }
                else
                {
                    instance = list;
                }
            }
            else if (reader.Token == JsonToken.ObjectStart)
            {
                AddObjectMetadata(value_type);
                ObjectMetadata t_data = object_metadata[value_type];

                instance = Activator.CreateInstance(value_type);

                while (true)
                {
                    reader.Read();

                    if (reader.Token == JsonToken.ObjectEnd)
                    {
                        break;
                    }

                    string property = (string)reader.Value;

                    if (t_data.Properties.ContainsKey(property))
                    {
                        PropertyMetadata prop_data =
                            t_data.Properties[property];

                        if (prop_data.IsField)
                        {
                            ((FieldInfo)prop_data.Info).SetValue(
                                instance, ReadValue(prop_data.Type, reader));
                        }
                        else
                        {
                            PropertyInfo p_info =
                                (PropertyInfo)prop_data.Info;

                            if (p_info.CanWrite)
                            {
                                p_info.SetValue(
                                    instance,
                                    ReadValue(prop_data.Type, reader),
                                    null);
                            }
                            else
                            {
                                ReadValue(prop_data.Type, reader);
                            }
                        }
                    }
                    else
                    {
                        if (!t_data.IsDictionary)
                        {
                            if (!reader.SkipNonMembers)
                            {
                                throw new JsonException(String.Format(
                                                            "The type {0} doesn't have the " +
                                                            "property '{1}'",
                                                            inst_type, property));
                            }
                            else
                            {
                                ReadSkip(reader);
                                continue;
                            }
                        }

                        ((IDictionary)instance).Add(
                            property, ReadValue(
                                t_data.ElementType, reader));
                    }
                }
            }

            return(instance);
        }
Exemplo n.º 2
0
        private static void AddObjectMetadata(Type type)
        {
            if (object_metadata.ContainsKey(type))
            {
                return;
            }

            ObjectMetadata data = new ObjectMetadata();

            if (type.GetInterface("System.Collections.IDictionary") != null)
            {
                data.IsDictionary = true;
            }

            data.Properties = new Dictionary <string, PropertyMetadata>();

            foreach (PropertyInfo p_info in type.GetProperties())
            {
                if (p_info.Name == "Item")
                {
                    ParameterInfo[] parameters = p_info.GetIndexParameters();

                    if (parameters.Length != 1)
                    {
                        continue;
                    }

                    if (parameters[0].ParameterType == typeof(string))
                    {
                        data.ElementType = p_info.PropertyType;
                    }

                    continue;
                }

                PropertyMetadata p_data = new PropertyMetadata();
                p_data.Info = p_info;
                p_data.Type = p_info.PropertyType;

                data.Properties.Add(p_info.Name, p_data);
            }

            foreach (FieldInfo f_info in type.GetFields())
            {
                PropertyMetadata p_data = new PropertyMetadata {
                    Info    = f_info,
                    IsField = true,
                    Type    = f_info.FieldType
                };

                data.Properties.Add(f_info.Name, p_data);
            }

            lock (object_metadata_lock) {
                try {
                    object_metadata.Add(type, data);
                } catch (ArgumentException) {
                    return;
                }
            }
        }