private void MergeAny(IMessage message, JsonTokenizer tokenizer)
{
// Record the token stream until we see the @type property. At that point, we can take the value, consult
// the type registry for the relevant message, and replay the stream, omitting the @type property.
var tokens = new List <JsonToken>();
var token = tokenizer.Next();
if (token.Type != JsonToken.TokenType.StartObject)
{
throw new InvalidProtocolBufferException("Expected object value for Any");
}
int typeUrlObjectDepth = tokenizer.ObjectDepth;
// The check for the property depth protects us from nested Any values which occur before the type URL
// for *this* Any.
while (token.Type != JsonToken.TokenType.Name ||
token.StringValue != JsonFormatter.AnyTypeUrlField ||
tokenizer.ObjectDepth != typeUrlObjectDepth)
{
tokens.Add(token);
token = tokenizer.Next();
if (tokenizer.ObjectDepth < typeUrlObjectDepth)
{
throw new InvalidProtocolBufferException("Any message with no @type");
}
}
// Don't add the @type property or its value to the recorded token list
token = tokenizer.Next();
if (token.Type != JsonToken.TokenType.StringValue)
{
throw new InvalidProtocolBufferException("Expected string value for Any.@type");
}
string typeUrl = token.StringValue;
string typeName = Any.GetTypeName(typeUrl);
MessageDescriptor descriptor = settings.TypeRegistry.Find(typeName);
if (descriptor == null)
{
throw new InvalidOperationException($"Type registry has no descriptor for type name '{typeName}'");
}
// Now replay the token stream we've already read and anything that remains of the object, just parsing it
// as normal. Our original tokenizer should end up at the end of the object.
var replay = JsonTokenizer.FromReplayedTokens(tokens, tokenizer);
var body = descriptor.Parser.CreateTemplate();
if (descriptor.IsWellKnownType)
{
MergeWellKnownTypeAnyBody(body, replay);
}
else
{
Merge(body, replay);
}
var data = body.ToByteString();
// Now that we have the message data, we can pack it into an Any (the message received as a parameter).
message.Descriptor.Fields[Any.TypeUrlFieldNumber].Accessor.SetValue(message, typeUrl);
message.Descriptor.Fields[Any.ValueFieldNumber].Accessor.SetValue(message, data);
}