/// <summary>
/// Writes the current <see cref="JsonReader"/> token.
/// </summary>
/// <param name="reader">The <see cref="JsonReader"/> to read the token from.</param>
public void WriteToken(JsonReader reader)
{
ValidationUtils.ArgumentNotNull(reader, "reader");
int currentDepth;
if (reader.TokenType == JsonToken.None)
currentDepth = -1;
else if (!IsStartToken(reader.TokenType))
currentDepth = reader.Depth + 1;
else
currentDepth = reader.Depth;
do
{
switch (reader.TokenType)
{
case JsonToken.None:
// read to next
break;
case JsonToken.StartObject:
WriteStartObject();
break;
case JsonToken.StartArray:
WriteStartArray();
break;
case JsonToken.StartConstructor:
string constructorName = reader.Value.ToString();
// write a JValue date when the constructor is for a date
if (string.Compare(constructorName, "Date", StringComparison.Ordinal) == 0)
WriteConstructorDate(reader);
else
WriteStartConstructor(reader.Value.ToString());
break;
case JsonToken.PropertyName:
WritePropertyName(reader.Value.ToString());
break;
case JsonToken.Comment:
WriteComment(reader.Value.ToString());
break;
case JsonToken.Integer:
WriteValue((long)reader.Value);
break;
case JsonToken.Float:
WriteValue((double)reader.Value);
break;
case JsonToken.String:
WriteValue(reader.Value.ToString());
break;
case JsonToken.Boolean:
WriteValue((bool)reader.Value);
break;
case JsonToken.Null:
WriteNull();
break;
case JsonToken.Undefined:
WriteUndefined();
break;
case JsonToken.EndObject:
WriteEndObject();
break;
case JsonToken.EndArray:
WriteEndArray();
break;
case JsonToken.EndConstructor:
WriteEndConstructor();
break;
case JsonToken.Date:
WriteValue((DateTime)reader.Value);
break;
case JsonToken.Raw:
WriteRawValue((string)reader.Value);
break;
default:
throw MiscellaneousUtils.CreateArgumentOutOfRangeException("TokenType", reader.TokenType, "Unexpected token type.");
}
}
while (
// stop if we have reached the end of the token being read
currentDepth - 1 < reader.Depth - (IsEndToken(reader.TokenType) ? 1 : 0)
&& reader.Read());
}
private void WriteConstructorDate(JsonReader reader)
{
if (!reader.Read())
throw new Exception("Unexpected end while reading date constructor.");
if (reader.TokenType != JsonToken.Integer)
throw new Exception("Unexpected token while reading date constructor. Expected Integer, got " + reader.TokenType);
long ticks = (long)reader.Value;
DateTime date = JsonConvert.ConvertJavaScriptTicksToDateTime(ticks);
if (!reader.Read())
throw new Exception("Unexpected end while reading date constructor.");
if (reader.TokenType != JsonToken.EndConstructor)
throw new Exception("Unexpected token while reading date constructor. Expected EndConstructor, got " + reader.TokenType);
WriteValue(date);
}
private object CreateObjectFromNonDefaultConstructor(Type objectType, JsonReader reader)
{
// object should have a single constructor
ConstructorInfo c = objectType.GetConstructors(BindingFlags.Public | BindingFlags.Instance).SingleOrDefault();
if (c == null)
throw new JsonSerializationException("Could not find a public constructor for type {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
// create a dictionary to put retrieved values into
JsonMemberMappingCollection memberMappings = GetMemberMappings(objectType);
IDictionary<JsonMemberMapping, object> mappingValues = memberMappings.ToDictionary(kv => kv, kv => (object)null);
bool exit = false;
while (!exit && reader.Read())
{
switch (reader.TokenType)
{
case JsonToken.PropertyName:
string memberName = reader.Value.ToString();
if (!reader.Read())
throw new JsonSerializationException("Unexpected end when setting {0}'s value.".FormatWith(CultureInfo.InvariantCulture, memberName));
JsonMemberMapping memberMapping;
// attempt exact case match first
// then try match ignoring case
if (memberMappings.TryGetClosestMatchMapping(memberName, out memberMapping))
{
if (!memberMapping.Ignored)
{
Type memberType = ReflectionUtils.GetMemberUnderlyingType(memberMapping.Member);
mappingValues[memberMapping] = CreateObject(reader, memberType, null, memberMapping.MemberConverter);
}
}
else
{
if (_missingMemberHandling == MissingMemberHandling.Error)
throw new JsonSerializationException("Could not find member '{0}' on object of type '{1}'".FormatWith(CultureInfo.InvariantCulture, memberName, objectType.Name));
reader.Skip();
}
break;
case JsonToken.EndObject:
exit = true;
break;
default:
throw new JsonSerializationException("Unexpected token when deserializing object: " + reader.TokenType);
}
}
IDictionary<ParameterInfo, object> constructorParameters = c.GetParameters().ToDictionary(p => p, p => (object)null);
IDictionary<JsonMemberMapping, object> remainingMappingValues = new Dictionary<JsonMemberMapping, object>();
foreach (KeyValuePair<JsonMemberMapping, object> mappingValue in mappingValues)
{
ParameterInfo matchingConstructorParameter = constructorParameters.ForgivingCaseSensitiveFind(kv => kv.Key.Name, mappingValue.Key.MappingName).Key;
if (matchingConstructorParameter != null)
constructorParameters[matchingConstructorParameter] = mappingValue.Value;
else
remainingMappingValues.Add(mappingValue);
}
object createdObject = ReflectionUtils.CreateInstance(objectType, constructorParameters.Values.ToArray());
// go through unused values and set the newly created object's properties
foreach (KeyValuePair<JsonMemberMapping, object> remainingMappingValue in remainingMappingValues)
{
if (ShouldSetMappingValue(remainingMappingValue.Key, remainingMappingValue.Value))
ReflectionUtils.SetMemberValue(remainingMappingValue.Key.Member, createdObject, remainingMappingValue.Value);
}
return createdObject;
}
private object PopulateObject(object newObject, JsonReader reader, Type objectType)
{
JsonMemberMappingCollection memberMappings = GetMemberMappings(objectType);
Dictionary<string, bool> requiredMappings =
memberMappings.Where(m => m.Required).ToDictionary(m => m.MappingName, m => false);
while (reader.Read())
{
switch (reader.TokenType)
{
case JsonToken.PropertyName:
string memberName = reader.Value.ToString();
if (!reader.Read())
throw new JsonSerializationException("Unexpected end when setting {0}'s value.".FormatWith(CultureInfo.InvariantCulture, memberName));
if (reader.TokenType != JsonToken.Null)
SetRequiredMapping(memberName, requiredMappings);
SetObjectMember(reader, newObject, objectType, memberName);
break;
case JsonToken.EndObject:
foreach (KeyValuePair<string, bool> requiredMapping in requiredMappings)
{
if (!requiredMapping.Value)
throw new JsonSerializationException("Required property '{0}' not found in JSON.".FormatWith(CultureInfo.InvariantCulture, requiredMapping.Key));
}
return newObject;
default:
throw new JsonSerializationException("Unexpected token when deserializing object: " + reader.TokenType);
}
}
throw new JsonSerializationException("Unexpected end when deserializing object.");
}
private IList PopulateList(IList list, Type listItemType, JsonReader reader)
{
while (reader.Read())
{
switch (reader.TokenType)
{
case JsonToken.EndArray:
return list;
case JsonToken.Comment:
break;
default:
object value = CreateObject(reader, listItemType, null, null);
list.Add(value);
break;
}
}
throw new JsonSerializationException("Unexpected end when deserializing array.");
}
private object CreateAndPopulateObject(JsonReader reader, Type objectType)
{
object newObject;
if (objectType.IsInterface || objectType.IsAbstract)
throw new JsonSerializationException("Could not create an instance of type {0}. Type is an interface or abstract class and cannot be instantated.".FormatWith(CultureInfo.InvariantCulture, objectType));
if (ReflectionUtils.HasDefaultConstructor(objectType))
{
newObject = Activator.CreateInstance(objectType);
PopulateObject(newObject, reader, objectType);
return newObject;
}
return CreateObjectFromNonDefaultConstructor(objectType, reader);
}
private IDictionary PopulateDictionary(IWrappedDictionary dictionary, JsonReader reader)
{
Type dictionaryType = dictionary.UnderlyingDictionary.GetType();
Type dictionaryKeyType = ReflectionUtils.GetDictionaryKeyType(dictionaryType);
Type dictionaryValueType = ReflectionUtils.GetDictionaryValueType(dictionaryType);
while (reader.Read())
{
switch (reader.TokenType)
{
case JsonToken.PropertyName:
object keyValue = EnsureType(reader.Value, dictionaryKeyType);
reader.Read();
dictionary.Add(keyValue, CreateObject(reader, dictionaryValueType, null, null));
break;
case JsonToken.EndObject:
return dictionary;
default:
throw new JsonSerializationException("Unexpected token when deserializing object: " + reader.TokenType);
}
}
throw new JsonSerializationException("Unexpected end when deserializing object.");
}
/// <summary>
/// Deserializes the Json structure contained by the specified <see cref="JsonReader"/>
/// into an instance of the specified type.
/// </summary>
/// <param name="reader">The <see cref="JsonReader"/> containing the object.</param>
/// <param name="objectType">The <see cref="Type"/> of object being deserialized.</param>
/// <returns>The instance of <paramref name="objectType"/> being deserialized.</returns>
public object Deserialize(JsonReader reader, Type objectType)
{
if (reader == null)
throw new ArgumentNullException("reader");
if (!reader.Read())
return null;
if (objectType != null)
return CreateObject(reader, objectType, null, null);
else
return CreateJToken(reader);
}
private void SetMappingValue(JsonMemberMapping memberMapping, JsonReader reader, object target)
{
if (memberMapping.Ignored)
{
reader.Skip();
return;
}
// get the member's underlying type
Type memberType = ReflectionUtils.GetMemberUnderlyingType(memberMapping.Member);
object currentValue = null;
bool useExistingValue = false;
if ((_objectCreationHandling == ObjectCreationHandling.Auto || _objectCreationHandling == ObjectCreationHandling.Reuse)
&& (reader.TokenType == JsonToken.StartArray || reader.TokenType == JsonToken.StartObject))
{
currentValue = ReflectionUtils.GetMemberValue(memberMapping.Member, target);
useExistingValue = (currentValue != null && !memberType.IsArray && !ReflectionUtils.InheritsGenericDefinition(memberType, typeof(ReadOnlyCollection<>)));
}
if (!memberMapping.Writable && !useExistingValue)
{
reader.Skip();
return;
}
object value = CreateObject(reader, memberType, (useExistingValue) ? currentValue : null, JsonTypeReflector.GetConverter(memberMapping.Member, memberType));
if (!useExistingValue && ShouldSetMappingValue(memberMapping, value))
ReflectionUtils.SetMemberValue(memberMapping.Member, target, value);
}
private object CreateAndPopulateDictionary(JsonReader reader, Type objectType)
{
if (IsTypeGenericDictionaryInterface(objectType))
{
Type keyType;
Type valueType;
ReflectionUtils.GetDictionaryKeyValueTypes(objectType, out keyType, out valueType);
objectType = ReflectionUtils.MakeGenericType(typeof(Dictionary<,>), keyType, valueType);
}
IWrappedDictionary dictionary = CollectionUtils.CreateDictionaryWrapper(Activator.CreateInstance(objectType));
PopulateDictionary(dictionary, reader);
return dictionary.UnderlyingDictionary;
}
private void SetObjectMember(JsonReader reader, object target, Type targetType, string memberName)
{
JsonMemberMappingCollection memberMappings = GetMemberMappings(targetType);
JsonMemberMapping memberMapping;
// attempt exact case match first
// then try match ignoring case
if (memberMappings.TryGetClosestMatchMapping(memberName, out memberMapping))
{
SetMappingValue(memberMapping, reader, target);
}
else
{
if (_missingMemberHandling == MissingMemberHandling.Error)
throw new JsonSerializationException("Could not find member '{0}' on object of type '{1}'".FormatWith(CultureInfo.InvariantCulture, memberName, targetType.Name));
reader.Skip();
}
}
private object CreateObject(JsonReader reader, Type objectType, object existingValue, JsonConverter memberConverter)
{
_level++;
object value;
JsonConverter converter;
if (memberConverter != null)
{
return memberConverter.ReadJson(reader, objectType);
}
else if (objectType != null && HasClassConverter(objectType, out converter))
{
return converter.ReadJson(reader, objectType);
}
else if (objectType != null && HasMatchingConverter(objectType, out converter))
{
return converter.ReadJson(reader, objectType);
}
else if (objectType == typeof(JsonRaw))
{
return JsonRaw.Create(reader);
}
else
{
switch (reader.TokenType)
{
// populate a typed object or generic dictionary/array
// depending upon whether an objectType was supplied
case JsonToken.StartObject:
if (objectType == null)
{
value = CreateJToken(reader);
}
else if (CollectionUtils.IsDictionaryType(objectType))
{
if (existingValue == null)
value = CreateAndPopulateDictionary(reader, objectType);
else
value = PopulateDictionary(CollectionUtils.CreateDictionaryWrapper(existingValue), reader);
}
else
{
if (existingValue == null)
value = CreateAndPopulateObject(reader, objectType);
else
value = PopulateObject(existingValue, reader, objectType);
}
break;
case JsonToken.StartArray:
if (objectType != null)
{
if (existingValue == null)
value = CreateAndPopulateList(reader, objectType);
else
value = PopulateList(CollectionUtils.CreateCollectionWrapper(existingValue), ReflectionUtils.GetCollectionItemType(objectType), reader);
}
else
{
value = CreateJToken(reader);
}
break;
case JsonToken.Integer:
case JsonToken.Float:
case JsonToken.String:
case JsonToken.Boolean:
case JsonToken.Date:
value = EnsureType(reader.Value, objectType);
break;
case JsonToken.StartConstructor:
case JsonToken.EndConstructor:
string constructorName = reader.Value.ToString();
value = constructorName;
break;
case JsonToken.Null:
case JsonToken.Undefined:
if (objectType == typeof(DBNull))
value = DBNull.Value;
else
value = null;
break;
default:
throw new JsonSerializationException("Unexpected token while deserializing object: " + reader.TokenType);
}
}
_level--;
return value;
}
private JToken CreateJToken(JsonReader reader)
{
JToken token;
using (JsonTokenWriter writer = new JsonTokenWriter())
{
writer.WriteToken(reader);
token = writer.Token;
}
return token;
}
/// <summary> /// Reads the JSON representation of the object. /// </summary> /// <param name="reader">The <see cref="JsonReader"/> to read from.</param> /// <param name="objectType">Type of the object.</param> /// <returns>The object value.</returns> public abstract object ReadJson(JsonReader reader, Type objectType);
private object CreateAndPopulateList(JsonReader reader, Type objectType)
{
if (IsTypeGenericCollectionInterface(objectType))
{
Type itemType = ReflectionUtils.GetCollectionItemType(objectType);
objectType = ReflectionUtils.MakeGenericType(typeof(List<>), itemType);
}
return CollectionUtils.CreateAndPopulateList(objectType, l => PopulateList(l, ReflectionUtils.GetCollectionItemType(objectType), reader));
}
/// <summary>
/// Creates an instance of <see cref="JsonRaw"/> with the content of the reader's current token.
/// </summary>
/// <param name="reader">The reader.</param>
/// <returns>An instance of <see cref="JsonRaw"/> with the content of the reader's current token.</returns>
public static JsonRaw Create(JsonReader reader)
{
using (StringWriter sw = new StringWriter(CultureInfo.InvariantCulture))
using (JsonTextWriter jsonWriter = new JsonTextWriter(sw))
{
jsonWriter.WriteToken(reader);
return new JsonRaw(sw.ToString());
}
}
/// <summary>
/// Deserializes the Json structure contained by the specified <see cref="JsonReader"/>.
/// </summary>
/// <param name="reader">The <see cref="JsonReader"/> that contains the Json structure to deserialize.</param>
/// <returns>The <see cref="Object"/> being deserialized.</returns>
public object Deserialize(JsonReader reader)
{
return Deserialize(reader, null);
}
