public bool TryGetFormatter(Type type, FormatterLocationStep step, ISerializationPolicy policy, out IFormatter formatter)
{
Type elementType;
if (step != FormatterLocationStep.AfterRegisteredFormatters || !GenericCollectionFormatter.CanFormat(type, out elementType))
{
formatter = null;
return(false);
}
formatter = (IFormatter)Activator.CreateInstance(typeof(GenericCollectionFormatter <,>).MakeGenericType(type, elementType));
return(true);
}
private static IFormatter CreateFormatter(Type type, ISerializationPolicy policy)
{
if (FormatterUtilities.IsPrimitiveType(type))
{
throw new ArgumentException("Cannot create formatters for a primitive type like " + type.Name);
}
bool canSelfFormat = type.ImplementsOrInherits(typeof(ISelfFormatter));
// If the type should always self format, there is no need to explore further.
// Otherwise, we go through the below checks first to see whether a custom
// formatter is defined.
if (canSelfFormat && type.IsDefined <AlwaysFormatsSelfAttribute>())
{
return((IFormatter)Activator.CreateInstance(typeof(SelfFormatterFormatter <>).MakeGenericType(type)));
}
// First, allow the FormatterResolve event to resolve the formatter if possible
// We always hold the lock in the CreateFormatter method, so we can safely
// invoke the event without worrying about other threads changing it.
if (FormatterResolvePrivate != null)
{
Type genericInterface = typeof(IFormatter <>).MakeGenericType(type);
foreach (var del in FormatterResolvePrivate.GetInvocationList())
{
IFormatter result = del.Method.Invoke(del.Target, new object[] { type }) as IFormatter;
if (result != null && result.GetType().ImplementsOrInherits(genericInterface))
{
return(result);
}
}
}
// Then try to find a custom formatter
{
Type formatterType;
if (CustomFormatterTypes.TryGetValue(type, out formatterType))
{
return((IFormatter)Activator.CreateInstance(formatterType));
}
}
if (type.IsGenericType)
{
// Then try to find a custom generic formatter.
// IE, if we're trying to serialize Dictionary<string, int>, we might have a formatter that declares it can handle
// Dictionary<TKey, TValue>. If so, we can use that.
Type genericTypeDefinition = type.GetGenericTypeDefinition();
Type formatterGenericTypeDefinition;
if (CustomGenericFormatterTypes.TryGetValue(genericTypeDefinition, out formatterGenericTypeDefinition))
{
var formatterType = formatterGenericTypeDefinition.MakeGenericType(type.GetGenericArguments());
return((IFormatter)Activator.CreateInstance(formatterType));
}
}
// Quick hack to support types derived from dictionary
if (type.ImplementsOpenGenericClass(typeof(Dictionary <,>)) && type.GetConstructor(Type.EmptyTypes) != null)
{
var dictArgs = type.GetArgumentsOfInheritedOpenGenericClass(typeof(Dictionary <,>));
var formatterType = typeof(DerivedDictionaryFormatter <, ,>).MakeGenericType(type, dictArgs[0], dictArgs[1]);
return((IFormatter)Activator.CreateInstance(formatterType));
}
// If there were no custom formatters found, the type can format itself
if (canSelfFormat)
{
return((IFormatter)Activator.CreateInstance(typeof(SelfFormatterFormatter <>).MakeGenericType(type)));
}
// Delegates get special behaviour, as they're weird
if (typeof(Delegate).IsAssignableFrom(type))
{
return((IFormatter)Activator.CreateInstance(typeof(DelegateFormatter <>).MakeGenericType(type)));
}
// Types get special behaviour, as they are often instances of special runtime types like System.MonoType which cannot be addressed at compile time.
if (typeof(Type).IsAssignableFrom(type))
{
return(new TypeFormatter());
}
if (type.IsArray)
{
// Custom behaviour for all arrays that don't have specific custom formatters
if (type.GetArrayRank() == 1)
{
if (FormatterUtilities.IsPrimitiveArrayType(type.GetElementType()))
{
return((IFormatter)Activator.CreateInstance(typeof(PrimitiveArrayFormatter <>).MakeGenericType(type.GetElementType())));
}
else
{
return((IFormatter)Activator.CreateInstance(typeof(ArrayFormatter <>).MakeGenericType(type.GetElementType())));
}
}
else
{
return((IFormatter)Activator.CreateInstance(typeof(MultiDimensionalArrayFormatter <,>).MakeGenericType(type, type.GetElementType())));
}
}
// If the type implements ISerializable, use the SerializableFormatter
if (type.ImplementsOrInherits(typeof(ISerializable)))
{
return((IFormatter)Activator.CreateInstance(typeof(SerializableFormatter <>).MakeGenericType(type)));
}
// If the type can be treated as a generic collection, do that
{
Type elementType;
if (GenericCollectionFormatter.CanFormat(type, out elementType))
{
return((IFormatter)Activator.CreateInstance(typeof(GenericCollectionFormatter <,>).MakeGenericType(type, elementType)));
}
}
// If we can, emit a formatter to handle serialization of this object
{
if (EmitUtilities.CanEmit)
{
return(FormatterEmitter.GetEmittedFormatter(type, policy));
}
}
if (EmitUtilities.CanEmit)
{
Debug.LogWarning("Fallback to reflection for type " + type.Name + " when emit is possible on this platform.");
}
// Finally, we fall back to a reflection-based formatter if nothing else has been found
return((IFormatter)Activator.CreateInstance(typeof(ReflectionFormatter <>).MakeGenericType(type)));
}
