private static ObjectActivator DictionaryActivator(Type expectedType)
{
var genericArgs = expectedType.GetGenericArguments();
if (genericArgs.Length != 2)
{
throw new DeserializationException(
$"Unexpected number of Dictionary generic arguments: {genericArgs.Length}");
}
ConstructorInfo constructor;
if (expectedType.IsInterface)
{
var dictType = typeof(Dictionary <,>).MakeGenericType(genericArgs);
ReflectionUtil.CheckType(expectedType, dictType);
constructor = dictType.GetConstructor(new[] { typeof(int) });
}
else
{
ReflectionUtil.CheckType(typeof(IDictionary), expectedType);
constructor = expectedType.GetConstructor(Type.EmptyTypes);
if (constructor == null)
{
throw new DeserializationException($"Unable to find default constructor for {expectedType}");
}
}
var activator = ReflectionUtil.CreateActivator(constructor);
return(activator);
}
private static ObjectActivator ListActivator(Type expectedType)
{
var genericArgs = expectedType.GetGenericArguments();
var argType = genericArgs.Length switch
{
0 => typeof(object),
1 => genericArgs[0],
_ => throw new DeserializationException(
$"Unexpected number of generic arguments for list: {genericArgs.Length}"),
};
ConstructorInfo constructor;
var interfaceType = typeof(ICollection <>).MakeGenericType(argType);
var listType = typeof(List <>).MakeGenericType(argType);
if (expectedType.IsAssignableFrom(listType))
{
constructor = listType.GetConstructor(new[] { typeof(int) });
}
else
{
ReflectionUtil.CheckType(interfaceType, expectedType);
constructor = expectedType.GetConstructor(Type.EmptyTypes);
if (constructor == null)
{
throw new DeserializationException($"Unable to find default constructor for {expectedType}");
}
}
var activator = ReflectionUtil.CreateActivator(constructor);
return(activator);
}
private static TypeActivator ClassActivator(Type expectedType)
{
var constructors =
expectedType.GetConstructors(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
.Where(c => c.IsDefined(typeof(ConstructorAttribute), true))
.ToList();
if (constructors.Count == 0)
{
throw new DeserializationException(
$"No constructors found for {expectedType} found with MaxMind.Db.Constructor attribute");
}
if (constructors.Count > 1)
{
throw new DeserializationException(
$"More than one constructor found for {expectedType} found with MaxMind.Db/Constructor attribute");
}
var constructor = constructors[0];
var parameters = constructor.GetParameters();
var paramNameTypes = new Dictionary <byte[], ParameterInfo>(new ByteArrayEqualityComparer());
var injectables = new Dictionary <string, ParameterInfo>();
var networkParams = new List <ParameterInfo>();
var alwaysCreated = new List <ParameterInfo>();
foreach (var param in parameters)
{
var injectableAttribute = param.GetCustomAttributes <InjectAttribute>().FirstOrDefault();
if (injectableAttribute != null)
{
injectables.Add(injectableAttribute.ParameterName, param);
}
var networkAttribute = param.GetCustomAttributes <NetworkAttribute>().FirstOrDefault();
if (networkAttribute != null)
{
networkParams.Add(param);
}
var paramAttribute = param.GetCustomAttributes <ParameterAttribute>().FirstOrDefault();
string name;
if (paramAttribute != null)
{
name = paramAttribute.ParameterName;
if (paramAttribute.AlwaysCreate)
{
alwaysCreated.Add(param);
}
}
else
{
name = param.Name;
}
paramNameTypes.Add(Encoding.UTF8.GetBytes(name), param);
}
var activator = ReflectionUtil.CreateActivator(constructor);
var clsConstructor = new TypeActivator(activator, paramNameTypes, injectables, networkParams, alwaysCreated);
return(clsConstructor);
}