internal static object ConvertObjectToType(object o, Type type, JSerializer serializer)
{
object convertedObject;
ConvertObjectToTypeMain(o, type, serializer, true, out convertedObject);
return(convertedObject);
}
internal static object BasicDeserialize(string input, int depthLimit, JSerializer serializer)
{
JObjectDeserializer jsod = new JObjectDeserializer(input, depthLimit, serializer);
object result = jsod.DeserializeInternal(0);
if (jsod._s.GetNextNonEmptyChar() != null)
{
throw new ArgumentException(string.Format(CultureInfo.InvariantCulture, AtlasWeb.JSON_IllegalPrimitive, jsod._s.ToString()));
}
return(result);
}
internal static object Deserialize(JSerializer serializer, string input, Type type, int depthLimit)
{
if (input == null)
{
throw new ArgumentNullException("input");
}
if (input.Length > serializer.MaxJsonLength)
{
throw new ArgumentException(AtlasWeb.JSON_MaxJsonLengthExceeded, "input");
}
var o = JObjectDeserializer.BasicDeserialize(input, depthLimit, serializer);
return(JObjectConverter.ConvertObjectToType(o, type, serializer));
}
// Is this a type for which we want to instantiate based on the client stub
internal static bool IsClientInstantiatableType(Type t, JSerializer serializer)
{
// Abstract classes and interfaces can't be instantiated
//
if (t == null || t.IsAbstract || t.IsInterface || t.IsArray)
{
return(false);
}
// Even though 'object' is instantiatable, it is never useful to do this
if (t == typeof(object))
{
return(false);
}
// Return true if a converter is registered for the given type, so the converter
// can generate code on the client to instantiate it.
JConverter converter = null;
if (serializer.ConverterExistsForType(t, out converter))
{
return(true);
}
// Value types are okay (i.e. structs);
if (t.IsValueType)
{
return(true);
}
// Ignore types that don't have a public default ctor
ConstructorInfo constructorInfo = t.GetConstructor(BindingFlags.Public | BindingFlags.Instance,
null, s_emptyTypeArray, null);
if (constructorInfo == null)
{
return(false);
}
return(true);
}
private static bool ConvertObjectToTypeMain(object o, Type type, JSerializer serializer, bool throwOnError, out object convertedObject)
{
// If it's null, there is nothing to convert
if (o == null)
{
// need to special case Char, as we convert \0 to null
if (type == typeof(char))
{
convertedObject = '\0';
return(true);
}
// Throw if its a value type and not a nullable
if (IsNonNullableValueType(type))
{
if (throwOnError)
{
throw new InvalidOperationException(AtlasWeb.JSON_ValueTypeCannotBeNull);
}
else
{
convertedObject = null;
return(false);
}
}
convertedObject = null;
return(true);
}
// simply return the current object if the current type is same as return type.
if (o.GetType() == type)
{
convertedObject = o;
return(true);
}
// otherwise use the converters to convert object into target type.
return(ConvertObjectToTypeInternal(o, type, serializer, throwOnError, out convertedObject));
}
/// <summary> /// 当在派生类中重写时，生成名称/值对的字典。 /// </summary> /// <param name="obj">要序列化的对象。</param> /// <param name="serializer">负责序列化的对象。</param> /// <returns>包含表示该对象数据的键/值对。</returns> public abstract IDictionary <string, object> Serialize(object obj, JSerializer serializer);
/// <summary>
/// 当在派生类中重写时，将所提供的字典转换为指定类型的对象。
/// </summary>
/// <param name="dictionary">作为名称/值对存储的属性数据的 <see cref="IDictionary{TKey,TValue}"/> 实例。</param>
/// <param name="type">所生成对象的类型。</param>
/// <param name="serializer"><see cref="JSerializer"/> 实例。</param>
/// <returns>反序列化的对象。</returns>
public abstract object Deserialize(IDictionary <string, object> dictionary, Type type, JSerializer serializer);
private JObjectDeserializer(string input, int depthLimit, JSerializer serializer)
{
_s = new JString(input);
_depthLimit = depthLimit;
_serializer = serializer;
}
// Method that converts an IDictionary<string, object> to an object of the right type
private static bool ConvertDictionaryToObject(IDictionary <string, object> dictionary, Type type, JSerializer serializer, bool throwOnError, out object convertedObject)
{
// The target type to instantiate.
Type targetType = type;
object s;
string serverTypeName = null;
object o = dictionary;
// Check if __serverType exists in the dictionary, use it as the type.
if (dictionary.TryGetValue(JSerializer.ServerTypeFieldName, out s))
{
// Convert the __serverType value to a string.
if (!ConvertObjectToTypeMain(s, typeof(String), serializer, throwOnError, out s))
{
convertedObject = false;
return(false);
}
serverTypeName = (string)s;
if (serverTypeName != null)
{
// If we don't have the JavaScriptTypeResolver, we can't use it
if (serializer.TypeResolver != null)
{
// Get the actual type from the resolver.
targetType = serializer.TypeResolver.ResolveType(serverTypeName);
// In theory, we should always find the type. If not, it may be some kind of attack.
if (targetType == null)
{
if (throwOnError)
{
throw new InvalidOperationException();
}
convertedObject = null;
return(false);
}
}
// Remove the serverType from the dictionary, even if the resolver was null
dictionary.Remove(JSerializer.ServerTypeFieldName);
}
}
JConverter converter = null;
if (targetType != null && serializer.ConverterExistsForType(targetType, out converter))
{
try
{
convertedObject = converter.Deserialize(dictionary, targetType, serializer);
return(true);
}
catch
{
if (throwOnError)
{
throw;
}
convertedObject = null;
return(false);
}
}
// Instantiate the type if it's coming from the __serverType argument.
if (serverTypeName != null || IsClientInstantiatableType(targetType, serializer))
{
// First instantiate the object based on the type.
o = Activator.CreateInstance(targetType);
}
// Use a different collection to avoid modifying the original during keys enumeration.
List <String> memberNames = new List <String>(dictionary.Keys);
// Try to handle the IDictionary<K, V> case
if (IsGenericDictionary(type))
{
Type keyType = type.GetGenericArguments()[0];
if (keyType != typeof(string) && keyType != typeof(object))
{
if (throwOnError)
{
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.JSON_DictionaryTypeNotSupported, type.FullName));
}
convertedObject = null;
return(false);
}
Type valueType = type.GetGenericArguments()[1];
IDictionary dict = null;
if (IsClientInstantiatableType(type, serializer))
{
dict = (IDictionary)Activator.CreateInstance(type);
}
else
{
// Get the strongly typed Dictionary<K, V>
Type t = _dictionaryGenericType.MakeGenericType(keyType, valueType);
dict = (IDictionary)Activator.CreateInstance(t);
}
if (dict != null)
{
foreach (string memberName in memberNames)
{
object memberObject;
if (!ConvertObjectToTypeMain(dictionary[memberName], valueType, serializer, throwOnError, out memberObject))
{
convertedObject = null;
return(false);
}
dict[memberName] = memberObject;
}
convertedObject = dict;
return(true);
}
}
// Fail if we know we cannot possibly return the required type.
if (type != null && !type.IsAssignableFrom(o.GetType()))
{
if (!throwOnError)
{
convertedObject = null;
return(false);
}
ConstructorInfo constructorInfo = type.GetConstructor(BindingFlags.Public | BindingFlags.Instance, null, s_emptyTypeArray, null);
if (constructorInfo == null)
{
throw new MissingMethodException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.JSON_NoConstructor, type.FullName));
}
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.JSON_DeserializerTypeMismatch, type.FullName));
}
var typeMapper = TypeMapper.Create(o.GetType());
foreach (string memberName in memberNames)
{
object propertyValue = dictionary[memberName];
// Assign the value into a property or field of the object
if (!AssignToProperty(typeMapper, propertyValue, o, memberName, serializer, throwOnError))
{
convertedObject = null;
return(false);
}
}
convertedObject = o;
return(true);
}
internal static bool TryConvertObjectToType(object o, Type type, JSerializer serializer, out object convertedObject)
{
return(ConvertObjectToTypeMain(o, type, serializer, false, out convertedObject));
}
// Method that converts client array to the request type. It handles the following cases:
// 1. type is not passed in - An ArrayList will be returned.
// 2. type is an array - An array of the right type will be returned.
// 3. type is an abstract collection interface, e.g. IEnumerable, ICollection -
// An ArrayList will be returned.
// 4. type is an generic abstract collection interface, e.g. IEnumerable<T> -
// An List<T> will be returned.
// 5. type is a concrete type that implements IList -
// The type will be instantiated and returned.
// Otherwise we throw InvalidOperationException.
private static bool ConvertListToObject(IList list, Type type, JSerializer serializer, bool throwOnError, out IList convertedList)
{
// Add the items into an ArrayList then convert to custom type when
// 1. Type is null or typeof(Object)
// 2. Type is an Array, in which case we call ArrayList.ToArray(type) or
// 3. Type is already an ArrayList
if (type == null || type == typeof(Object) || IsArrayListCompatible(type))
{
Type elementType = typeof(Object);
if (type != null && type != typeof(Object))
{
elementType = type.GetElementType();
}
ArrayList newList = new ArrayList();
// Add the items to the new List and recursive into each item.
if (!AddItemToList(list, newList, elementType, serializer, throwOnError))
{
convertedList = null;
return(false);
}
if (type == typeof(ArrayList) || type == typeof(IEnumerable) || type == typeof(IList) || type == typeof(ICollection))
{
convertedList = newList;
return(true);
}
convertedList = newList.ToArray(elementType);
return(true);
}
// Add the items into an List<T> then convert to the custom generic type when
// 1. Type is a generic collection type
// 2. Type only has one generic parameter, eg. List<string> vs MyCustom<T, V>
// 3. Type implements IEnumerable<T>
else if (type.IsGenericType &&
type.GetGenericArguments().Length == 1)
{
// gets the T of List<T> as the elementType
Type elementType = type.GetGenericArguments()[0];
// Get the strongly typed IEnumerable<T>
Type strongTypedEnumerable = _enumerableGenericType.MakeGenericType(elementType);
// Make sure the custom type can be assigned to IEnumerable<T>
if (strongTypedEnumerable.IsAssignableFrom(type))
{
// Get the strongly typed List<T>
Type t = _listGenericType.MakeGenericType(elementType);
// Create the List<T> instance or a MyList<T>
IList newList = null;
if (IsClientInstantiatableType(type, serializer) && typeof(IList).IsAssignableFrom(type))
{
newList = (IList)Activator.CreateInstance(type);
}
else
{
// If this is MyList<T> and we can't assign to it, throw
if (t.IsAssignableFrom(type))
{
if (throwOnError)
{
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.JSON_CannotCreateListType, type.FullName));
}
else
{
convertedList = null;
return(false);
}
}
newList = (IList)Activator.CreateInstance(t);
}
// Add the items to the new List and recursive into each item.
if (!AddItemToList(list, newList, elementType, serializer, throwOnError))
{
convertedList = null;
return(false);
}
convertedList = newList;
return(true);
}
}
// If the custom type implements IList and it's instantiable. Use that type.
else if (IsClientInstantiatableType(type, serializer) && typeof(IList).IsAssignableFrom(type))
{
IList newList = (IList)Activator.CreateInstance(type);
// Add the items to the new List and recursive into each item.
if (!AddItemToList(list, newList, null, serializer, throwOnError))
{
convertedList = null;
return(false);
}
convertedList = newList;
return(true);
}
if (throwOnError)
{
throw new InvalidOperationException(String.Format(
CultureInfo.CurrentCulture, AtlasWeb.JSON_ArrayTypeNotSupported, type.FullName));
}
else
{
convertedList = null;
return(false);
}
}
// Helper method that assigns the propertyValue to object o's member (memberName)
private static bool AssignToProperty(TypeMapper typeMapper, object propertyValue, object o, string memberName, JSerializer serializer, bool throwOnError)
{
var dictionary = o as IDictionary;
// if o is already an idictionary, assign the value to the dictionary
if (dictionary != null)
{
if (!ConvertObjectToTypeMain(propertyValue, null, serializer, throwOnError, out propertyValue))
{
return(false);
}
dictionary[memberName] = propertyValue;
return(true);
}
typeMapper[memberName]?.SetValue(o, propertyValue, false);
// not a property , so it is ignored
return(true);
}
// Helper method that converts the object to the corresponding type using converters.
// Items in IDictionary<string, object> and ArrayList needs to be converted as well.
// Note this method does not invoke the custom converter for deserialization.
private static bool ConvertObjectToTypeInternal(object o, Type type, JSerializer serializer, bool throwOnError, out object convertedObject)
{
// First checks if the object is an IDictionary<string, object>
IDictionary <string, object> dictionary = o as IDictionary <string, object>;
if (dictionary != null)
{
return(ConvertDictionaryToObject(dictionary, type, serializer, throwOnError, out convertedObject));
}
// If it is an IList try to convert it to the requested type.
IList list = o as IList;
if (list != null)
{
IList convertedList;
if (ConvertListToObject(list, type, serializer, throwOnError, out convertedList))
{
convertedObject = convertedList;
return(true);
}
else
{
convertedObject = null;
return(false);
}
}
// simply return the current object if
// 1) the caller does not specify the return type.
// 2) if the current type is same as return type.
if (type == null || o.GetType() == type)
{
convertedObject = o;
return(true);
}
// Otherwise use the type converter to convert the string to the target type.
TypeConverter converter = TypeDescriptor.GetConverter(type);
// Use the memberType's converter to directly conver if supported.
if (converter.CanConvertFrom(o.GetType()))
{
try
{
convertedObject = converter.ConvertFrom(null, CultureInfo.InvariantCulture, o);
return(true);
}
catch
{
if (throwOnError)
{
throw;
}
else
{
convertedObject = null;
return(false);
}
}
}
// Otherwise if the target type can be converted from a string
// 1. first use the propertyValue's converter to convert object to string,
// 2. then use the target converter to convert the string to target type.
if (converter.CanConvertFrom(typeof(String)))
{
try
{
string s;
if (o is DateTime)
{
// when converting from DateTime it is important to use the 'u' format
// so it contains the 'Z' indicating that it is UTC time.
// If converting to DateTimeOffset this ensures the value is correct, since otherwise
// the deafult offset would be assumed, which is the server's timezone.
s = ((DateTime)o).ToUniversalTime().ToString("u", CultureInfo.InvariantCulture);
}
else
{
TypeConverter propertyConverter = TypeDescriptor.GetConverter(o);
s = propertyConverter.ConvertToInvariantString(o);
}
convertedObject = converter.ConvertFromInvariantString(s);
return(true);
}
catch
{
if (throwOnError)
{
throw;
}
else
{
convertedObject = null;
return(false);
}
}
}
// We can't convert object o to the target type, but perhaps o can be
// assigned directly to type?
if (type.IsAssignableFrom(o.GetType()))
{
convertedObject = o;
return(true);
}
// Nothing works
if (throwOnError)
{
throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, AtlasWeb.JSON_CannotConvertObjectToType, o.GetType(), type));
}
else
{
convertedObject = null;
return(false);
}
}
// Helper method that recursively convert individual items in the old array
private static bool AddItemToList(IList oldList, IList newList, Type elementType, JSerializer serializer, bool throwOnError)
{
object convertedObject;
foreach (Object propertyValue in oldList)
{
if (!ConvertObjectToTypeMain(propertyValue, elementType, serializer, throwOnError, out convertedObject))
{
return(false);
}
newList.Add(convertedObject);
}
return(true);
}
internal static string SerializeInternal(object o)
{
JSerializer serializer = new JSerializer();
return(serializer.Serialize(o));
}
