Equivalent of JsonDecoder for Ruby?

[Brandon Ballinger]

I'm currently using Avro to serialize/deserialize data in Java and
Ruby. In Java, I can use JsonDecoder to deserialize a JSON string as
an Avro buffer. What is the equivalent class in Ruby? I searched the
source repository at
https://github.com/apache/avro/tree/trunk/lang/ruby/lib/avro, but I
only see BinaryDecoder/BinaryEncoder, not the JSON equivalents.

Thanks,
Brandon