private bool CalculatePropertyDetails(JsonProperty property, ref JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, object target, out bool useExistingValue, out object currentValue, out JsonContract propertyContract, out bool gottenCurrentValue) { currentValue = null; useExistingValue = false; propertyContract = null; gottenCurrentValue = false; if (property.Ignored) return true; JsonToken tokenType = reader.TokenType; if (property.PropertyContract == null) property.PropertyContract = GetContractSafe(property.PropertyType); ObjectCreationHandling objectCreationHandling = property.ObjectCreationHandling.GetValueOrDefault(Serializer._objectCreationHandling); if ((objectCreationHandling != ObjectCreationHandling.Replace) && (tokenType == JsonToken.StartArray || tokenType == JsonToken.StartObject) && property.Readable) { currentValue = property.ValueProvider.GetValue(target); gottenCurrentValue = true; if (currentValue != null) { propertyContract = GetContractSafe(currentValue.GetType()); useExistingValue = (!propertyContract.IsReadOnlyOrFixedSize && !propertyContract.UnderlyingType.IsValueType()); } } if (!property.Writable && !useExistingValue) return true; // test tokentype here because null might not be convertable to some types, e.g. ignoring null when applied to DateTime if (property.NullValueHandling.GetValueOrDefault(Serializer._nullValueHandling) == NullValueHandling.Ignore && tokenType == JsonToken.Null) return true; // test tokentype here because default value might not be convertable to actual type, e.g. default of "" for DateTime if (HasFlag(property.DefaultValueHandling.GetValueOrDefault(Serializer._defaultValueHandling), DefaultValueHandling.Ignore) && !HasFlag(property.DefaultValueHandling.GetValueOrDefault(Serializer._defaultValueHandling), DefaultValueHandling.Populate) && JsonReader.IsPrimitiveToken(tokenType) && MiscellaneousUtils.ValueEquals(reader.Value, property.GetResolvedDefaultValue())) return true; if (currentValue == null) { propertyContract = property.PropertyContract; } else { propertyContract = GetContractSafe(currentValue.GetType()); if (propertyContract != property.PropertyContract) propertyConverter = GetConverter(propertyContract, property.MemberConverter, containerContract, containerProperty); } return false; }
private void ResolveTypeName(JsonReader reader, ref Type objectType, ref JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, string qualifiedTypeName) { TypeNameHandling resolvedTypeNameHandling = ((member != null) ? member.TypeNameHandling : null) ?? ((containerContract != null) ? containerContract.ItemTypeNameHandling : null) ?? ((containerMember != null) ? containerMember.ItemTypeNameHandling : null) ?? Serializer._typeNameHandling; if (resolvedTypeNameHandling != TypeNameHandling.None) { string typeName; string assemblyName; ReflectionUtils.SplitFullyQualifiedTypeName(qualifiedTypeName, out typeName, out assemblyName); Type specifiedType; try { specifiedType = Serializer._binder.BindToType(assemblyName, typeName); } catch (Exception ex) { throw JsonSerializationException.Create(reader, "Error resolving type specified in JSON '{0}'.".FormatWith(CultureInfo.InvariantCulture, qualifiedTypeName), ex); } if (specifiedType == null) throw JsonSerializationException.Create(reader, "Type specified in JSON '{0}' was not resolved.".FormatWith(CultureInfo.InvariantCulture, qualifiedTypeName)); if (TraceWriter != null && TraceWriter.LevelFilter >= TraceLevel.Verbose) TraceWriter.Trace(TraceLevel.Verbose, JsonPosition.FormatMessage(reader as IJsonLineInfo, reader.Path, "Resolved type '{0}' to {1}.".FormatWith(CultureInfo.InvariantCulture, qualifiedTypeName, specifiedType)), null); if (objectType != null #if !(NET35 || NET20 || PORTABLE40) && objectType != typeof(IDynamicMetaObjectProvider) #endif && !objectType.IsAssignableFrom(specifiedType)) throw JsonSerializationException.Create(reader, "Type specified in JSON '{0}' is not compatible with '{1}'.".FormatWith(CultureInfo.InvariantCulture, specifiedType.AssemblyQualifiedName, objectType.AssemblyQualifiedName)); objectType = specifiedType; contract = GetContractSafe(specifiedType); } }
private bool SetPropertyValue(JsonProperty property, JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, object target) { object currentValue; bool useExistingValue; JsonContract propertyContract; bool gottenCurrentValue; if (CalculatePropertyDetails(property, ref propertyConverter, containerContract, containerProperty, reader, target, out useExistingValue, out currentValue, out propertyContract, out gottenCurrentValue)) return false; object value; if (propertyConverter != null && propertyConverter.CanRead) { if (!gottenCurrentValue && target != null && property.Readable) currentValue = property.ValueProvider.GetValue(target); value = DeserializeConvertable(propertyConverter, reader, property.PropertyType, currentValue); } else { value = CreateValueInternal(reader, property.PropertyType, propertyContract, property, containerContract, containerProperty, (useExistingValue) ? currentValue : null); } // always set the value if useExistingValue is false, // otherwise also set it if CreateValue returns a new value compared to the currentValue // this could happen because of a JsonConverter against the type if ((!useExistingValue || value != currentValue) && ShouldSetPropertyValue(property, value)) { property.ValueProvider.SetValue(target, value); if (property.SetIsSpecified != null) { if (TraceWriter != null && TraceWriter.LevelFilter >= TraceLevel.Verbose) TraceWriter.Trace(TraceLevel.Verbose, JsonPosition.FormatMessage(reader as IJsonLineInfo, reader.Path, "IsSpecified for property '{0}' on {1} set to true.".FormatWith(CultureInfo.InvariantCulture, property.PropertyName, property.DeclaringType)), null); property.SetIsSpecified(target, true); } return true; } // the value wasn't set be JSON was populated onto the existing value return useExistingValue; }
private bool ReadMetadataProperties(JsonReader reader, ref Type objectType, ref JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, object existingValue, out object newValue, out string id) { id = null; newValue = null; if (reader.TokenType == JsonToken.PropertyName) { string propertyName = reader.Value.ToString(); if (propertyName.Length > 0 && propertyName[0] == '$') { // read metadata properties // $type, $id, $ref, etc bool metadataProperty; do { propertyName = reader.Value.ToString(); if (string.Equals(propertyName, JsonTypeReflector.RefPropertyName, StringComparison.Ordinal)) { CheckedRead(reader); if (reader.TokenType != JsonToken.String && reader.TokenType != JsonToken.Null) throw JsonSerializationException.Create(reader, "JSON reference {0} property must have a string or null value.".FormatWith(CultureInfo.InvariantCulture, JsonTypeReflector.RefPropertyName)); string reference = (reader.Value != null) ? reader.Value.ToString() : null; CheckedRead(reader); if (reference != null) { if (reader.TokenType == JsonToken.PropertyName) throw JsonSerializationException.Create(reader, "Additional content found in JSON reference object. A JSON reference object should only have a {0} property.".FormatWith(CultureInfo.InvariantCulture, JsonTypeReflector.RefPropertyName)); newValue = Serializer.GetReferenceResolver().ResolveReference(this, reference); if (TraceWriter != null && TraceWriter.LevelFilter >= TraceLevel.Info) TraceWriter.Trace(TraceLevel.Info, JsonPosition.FormatMessage(reader as IJsonLineInfo, reader.Path, "Resolved object reference '{0}' to {1}.".FormatWith(CultureInfo.InvariantCulture, reference, newValue.GetType())), null); return true; } else { metadataProperty = true; } } else if (string.Equals(propertyName, JsonTypeReflector.TypePropertyName, StringComparison.Ordinal)) { CheckedRead(reader); string qualifiedTypeName = reader.Value.ToString(); ResolveTypeName(reader, ref objectType, ref contract, member, containerContract, containerMember, qualifiedTypeName); CheckedRead(reader); metadataProperty = true; } else if (string.Equals(propertyName, JsonTypeReflector.IdPropertyName, StringComparison.Ordinal)) { CheckedRead(reader); id = (reader.Value != null) ? reader.Value.ToString() : null; CheckedRead(reader); metadataProperty = true; } else if (string.Equals(propertyName, JsonTypeReflector.ArrayValuesPropertyName, StringComparison.Ordinal)) { CheckedRead(reader); object list = CreateList(reader, objectType, contract, member, existingValue, id); CheckedRead(reader); newValue = list; return true; } else { metadataProperty = false; } } while (metadataProperty && reader.TokenType == JsonToken.PropertyName); } } return false; }
private bool ReadMetadataPropertiesToken(JTokenReader reader, ref Type objectType, ref JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, object existingValue, out object newValue, out string id) { id = null; newValue = null; if (reader.TokenType == JsonToken.StartObject) { JObject current = (JObject)reader._current; JToken refToken = current[JsonTypeReflector.RefPropertyName]; if (refToken != null) { if (refToken.Type != JTokenType.String && refToken.Type != JTokenType.Null) throw JsonSerializationException.Create(refToken, refToken.Path, "JSON reference {0} property must have a string or null value.".FormatWith(CultureInfo.InvariantCulture, JsonTypeReflector.RefPropertyName), null); JToken property = refToken.Parent; JToken additionalContent = null; if (property.Next != null) additionalContent = property.Next; else if (property.Previous != null) additionalContent = property.Previous; string reference = (string)refToken; if (reference != null) { if (additionalContent != null) throw JsonSerializationException.Create(additionalContent, additionalContent.Path, "Additional content found in JSON reference object. A JSON reference object should only have a {0} property.".FormatWith(CultureInfo.InvariantCulture, JsonTypeReflector.RefPropertyName), null); newValue = Serializer.GetReferenceResolver().ResolveReference(this, reference); if (TraceWriter != null && TraceWriter.LevelFilter >= TraceLevel.Info) TraceWriter.Trace(TraceLevel.Info, JsonPosition.FormatMessage(reader as IJsonLineInfo, reader.Path, "Resolved object reference '{0}' to {1}.".FormatWith(CultureInfo.InvariantCulture, reference, newValue.GetType())), null); reader.Skip(); return true; } } JToken typeToken = current[JsonTypeReflector.TypePropertyName]; if (typeToken != null) { string qualifiedTypeName = (string)typeToken; JsonReader typeTokenReader = typeToken.CreateReader(); CheckedRead(typeTokenReader); ResolveTypeName(typeTokenReader, ref objectType, ref contract, member, containerContract, containerMember, qualifiedTypeName); JToken valueToken = current[JsonTypeReflector.ValuePropertyName]; if (valueToken != null) { while (true) { CheckedRead(reader); if (reader.TokenType == JsonToken.PropertyName) { if ((string)reader.Value == JsonTypeReflector.ValuePropertyName) return false; } CheckedRead(reader); reader.Skip(); } } } JToken idToken = current[JsonTypeReflector.IdPropertyName]; if (idToken != null) { id = (string)idToken; } JToken valuesToken = current[JsonTypeReflector.ArrayValuesPropertyName]; if (valuesToken != null) { JsonReader listReader = valuesToken.CreateReader(); CheckedRead(listReader); newValue = CreateList(listReader, objectType, contract, member, existingValue, id); reader.Skip(); return true; } } CheckedRead(reader); return false; }
private object CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, object existingValue) { string id; object newValue; Type resolvedObjectType = objectType; if (Serializer.MetadataPropertyHandling == MetadataPropertyHandling.ReadAhead) { var tokenReader = reader as JTokenReader; if (tokenReader == null) { JToken t = JToken.ReadFrom(reader); tokenReader = (JTokenReader)t.CreateReader(); // start CheckedRead(tokenReader); reader = tokenReader; } if (ReadMetadataPropertiesToken(tokenReader, ref resolvedObjectType, ref contract, member, containerContract, containerMember, existingValue, out newValue, out id)) return newValue; } else { CheckedRead(reader); if (ReadMetadataProperties(reader, ref resolvedObjectType, ref contract, member, containerContract, containerMember, existingValue, out newValue, out id)) return newValue; } if (HasNoDefinedType(contract)) return CreateJObject(reader); switch (contract.ContractType) { case JsonContractType.Object: { bool createdFromNonDefaultCreator = false; JsonObjectContract objectContract = (JsonObjectContract)contract; object targetObject; // check that if type name handling is being used that the existing value is compatible with the specified type if (existingValue != null && (resolvedObjectType == objectType || resolvedObjectType.IsAssignableFrom(existingValue.GetType()))) targetObject = existingValue; else targetObject = CreateNewObject(reader, objectContract, member, containerMember, id, out createdFromNonDefaultCreator); // don't populate if read from non-default creator because the object has already been read if (createdFromNonDefaultCreator) return targetObject; return PopulateObject(targetObject, reader, objectContract, member, id); } case JsonContractType.Primitive: { JsonPrimitiveContract primitiveContract = (JsonPrimitiveContract)contract; // if the content is inside $value then read past it if (reader.TokenType == JsonToken.PropertyName && string.Equals(reader.Value.ToString(), JsonTypeReflector.ValuePropertyName, StringComparison.Ordinal)) { CheckedRead(reader); // the token should not be an object because the $type value could have been included in the object // without needing the $value property if (reader.TokenType == JsonToken.StartObject) throw JsonSerializationException.Create(reader, "Unexpected token when deserializing primitive value: " + reader.TokenType); object value = CreateValueInternal(reader, resolvedObjectType, primitiveContract, member, null, null, existingValue); CheckedRead(reader); return value; } break; } case JsonContractType.Dictionary: { JsonDictionaryContract dictionaryContract = (JsonDictionaryContract)contract; object targetDictionary; if (existingValue == null) { bool createdFromNonDefaultCreator; IDictionary dictionary = CreateNewDictionary(reader, dictionaryContract, out createdFromNonDefaultCreator); if (createdFromNonDefaultCreator) { if (id != null) throw JsonSerializationException.Create(reader, "Cannot preserve reference to readonly dictionary, or dictionary created from a non-default constructor: {0}.".FormatWith(CultureInfo.InvariantCulture, contract.UnderlyingType)); if (contract.OnSerializingCallbacks.Count > 0) throw JsonSerializationException.Create(reader, "Cannot call OnSerializing on readonly dictionary, or dictionary created from a non-default constructor: {0}.".FormatWith(CultureInfo.InvariantCulture, contract.UnderlyingType)); if (contract.OnErrorCallbacks.Count > 0) throw JsonSerializationException.Create(reader, "Cannot call OnError on readonly list, or dictionary created from a non-default constructor: {0}.".FormatWith(CultureInfo.InvariantCulture, contract.UnderlyingType)); if (dictionaryContract.ParametrizedCreator == null) throw JsonSerializationException.Create(reader, "Cannot deserialize readonly or fixed size dictionary: {0}.".FormatWith(CultureInfo.InvariantCulture, contract.UnderlyingType)); } PopulateDictionary(dictionary, reader, dictionaryContract, member, id); if (createdFromNonDefaultCreator) { return dictionaryContract.ParametrizedCreator(dictionary); } else if (dictionary is IWrappedDictionary) { return ((IWrappedDictionary)dictionary).UnderlyingDictionary; } targetDictionary = dictionary; } else { targetDictionary = PopulateDictionary(dictionaryContract.ShouldCreateWrapper ? dictionaryContract.CreateWrapper(existingValue) : (IDictionary)existingValue, reader, dictionaryContract, member, id); } return targetDictionary; } #if !(NET35 || NET20 || PORTABLE40) case JsonContractType.Dynamic: JsonDynamicContract dynamicContract = (JsonDynamicContract)contract; return CreateDynamic(reader, dynamicContract, member, id); #endif #if !(NETFX_CORE || PORTABLE40 || PORTABLE) case JsonContractType.Serializable: JsonISerializableContract serializableContract = (JsonISerializableContract)contract; return CreateISerializable(reader, serializableContract, member, id); #endif } throw JsonSerializationException.Create(reader, @"Cannot deserialize the current JSON object (e.g. {{""name"":""value""}}) into type '{0}' because the type requires a {1} to deserialize correctly. To fix this error either change the JSON to a {1} or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List<T>) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object. ".FormatWith(CultureInfo.InvariantCulture, resolvedObjectType, GetExpectedDescription(contract))); }
private JsonConverter GetConverter(JsonContract contract, JsonConverter memberConverter, JsonContainerContract containerContract, JsonProperty containerProperty) { JsonConverter converter = null; if (memberConverter != null) { // member attribute converter converter = memberConverter; } else if (containerProperty != null && containerProperty.ItemConverter != null) { converter = containerProperty.ItemConverter; } else if (containerContract != null && containerContract.ItemConverter != null) { converter = containerContract.ItemConverter; } else if (contract != null) { JsonConverter matchingConverter; if (contract.Converter != null) // class attribute converter converter = contract.Converter; else if ((matchingConverter = Serializer.GetMatchingConverter(contract.UnderlyingType)) != null) // passed in converters converter = matchingConverter; else if (contract.InternalConverter != null) // internally specified converter converter = contract.InternalConverter; } return converter; }
private object CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, object existingValue) { if (contract != null && contract.ContractType == JsonContractType.Linq) return CreateJToken(reader, contract); do { switch (reader.TokenType) { // populate a typed object or generic dictionary/array // depending upon whether an objectType was supplied case JsonToken.StartObject: return CreateObject(reader, objectType, contract, member, containerContract, containerMember, existingValue); case JsonToken.StartArray: return CreateList(reader, objectType, contract, member, existingValue, null); case JsonToken.Integer: case JsonToken.Float: case JsonToken.Boolean: case JsonToken.Date: case JsonToken.Bytes: return EnsureType(reader, reader.Value, CultureInfo.InvariantCulture, contract, objectType); case JsonToken.String: string s = (string)reader.Value; // convert empty string to null automatically for nullable types if (string.IsNullOrEmpty(s) && objectType != typeof(string) && objectType != typeof(object) && contract != null && contract.IsNullable) return null; // string that needs to be returned as a byte array should be base 64 decoded if (objectType == typeof(byte[])) return Convert.FromBase64String(s); return EnsureType(reader, s, CultureInfo.InvariantCulture, contract, objectType); case JsonToken.StartConstructor: string constructorName = reader.Value.ToString(); return EnsureType(reader, constructorName, CultureInfo.InvariantCulture, contract, objectType); case JsonToken.Null: case JsonToken.Undefined: #if !(NETFX_CORE || PORTABLE40 || PORTABLE) if (objectType == typeof(DBNull)) return DBNull.Value; #endif return EnsureType(reader, reader.Value, CultureInfo.InvariantCulture, contract, objectType); case JsonToken.Raw: return new JRaw((string)reader.Value); case JsonToken.Comment: // ignore break; default: throw JsonSerializationException.Create(reader, "Unexpected token while deserializing object: " + reader.TokenType); } } while (reader.Read()); throw JsonSerializationException.Create(reader, "Unexpected end when deserializing object."); }