public static object ReadObject(
JsonElement obj,
IOpenApiType itemType,
Type itemClrType,
IOpenApiTypeHandler typeHandler,
bool objectAsDelta = false)
{
if (itemType == null)
{
throw new SerializationException("Cannot deserialize unknown type.");
}
var properties = obj.EnumerateObject().ToDictionary(p => p.Name, p => p.Value);
if (properties.TryGetValue("@odata.type", out var type) && type.ValueKind == JsonValueKind.String)
{
var typeName = type.GetString();
var actualType = typeHandler.ResolveType(typeName);
if (actualType == null)
{
throw new SerializationException($"No type with identifier '{typeName}' found");
}
if (!itemClrType.IsAssignableFrom(actualType.ClrType))
{
throw new SerializationException($"Type '{typeName}' is not assignable to '{itemType.JsonName}'");
}
itemType = actualType;
itemClrType = actualType.ClrType;
}
var instance = objectAsDelta
? Activator.CreateInstance(typeof(Delta <>).MakeGenericType(itemClrType))
: Activator.CreateInstance(itemClrType);
foreach (var member in properties)
{
if (itemType.TryGetProperty(member.Key, out var property))
{
var propertyType = typeHandler.ResolveType(property.ClrProperty.PropertyType);
var value = ReadValue(member.Value,
propertyType,
property.ClrProperty.PropertyType,
typeHandler,
objectAsDelta);
// TODO: check for components in the model binding area which help us here
// many conversions (string -> enum,date,timespan) etc. do not work like this.
property.SetValue(instance, value);
}
else
{
// TODO: how do we want to treat unknown props? fail or ignore?
}
}
return(instance);
}
private object ReadObject(
ref Utf8JsonReader reader,
IOpenApiType itemType,
Type itemClrType,
JsonSerializerOptions options)
{
if (itemType == null)
{
throw new JsonException($"Cannot deserialize unknown type.");
}
// TODO: better object creation, and polymorphism handling!
var instance = Activator.CreateInstance(itemClrType);
while (reader.Read())
{
if (reader.TokenType == JsonTokenType.EndObject)
{
return(instance);
}
if (reader.TokenType != JsonTokenType.PropertyName)
{
throw new JsonException($"Unexpected JSON Token {reader.TokenType}.");
}
var propertyName = reader.GetString();
if (itemType.TryGetProperty(propertyName, out var property))
{
var propertyType = _typeHandler.ResolveType(property.ClrProperty.PropertyType);
var value = ReadValue(ref reader, propertyType, property.ClrProperty.PropertyType, options);
property.SetValue(instance, value);
}
else
{
throw new JsonException($"Unexpected property {propertyName}.");
}
}
throw new JsonException($"Unexpected end of stream.");
}