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.Float ||
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);
}
// If there's a custom importer that fits, use it
if (custom_importers_table.ContainsKey(json_type) &&
custom_importers_table[json_type].ContainsKey(
value_type))
{
ImporterFunc importer =
custom_importers_table[json_type][value_type];
return(importer(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;
}
}
object key;
var key_type = value_type.GetGenericArguments()[0];
if (key_type.IsSubclassOf(typeof(Enum)))
{
key = Enum.Parse(key_type, property);
}
else
{
key = Convert.ChangeType(property, key_type);
}
((IDictionary)instance).Add(key, ReadValue(
t_data.ElementType, reader));
}
}
}
return(instance);
}
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())
{
bool ignore = false;
foreach (var attr in p_info.GetCustomAttributes(false))
{
if (attr.GetType() == typeof(JsonIgnoreAttribute))
{
ignore = true;
break;
}
}
if (ignore)
{
continue;
}
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())
{
bool ignore = false;
foreach (var attr in f_info.GetCustomAttributes(false))
{
if (attr.GetType() == typeof(JsonIgnoreAttribute))
{
ignore = true;
break;
}
}
if (ignore)
{
continue;
}
PropertyMetadata p_data = new PropertyMetadata();
p_data.Info = f_info;
p_data.IsField = true;
p_data.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;
}
}
}
