Convert Protocol Buffers to JSON

Twister pairs nicely with Jackson’s ObjectMapper since they both use POJOs.

Encode Protocol Buffer Messages to a JSON String

Person person = Person.newBuilder()
        .setId(1)
        .setName("John Doe")
        .setAge(30)
        .setCity("New York")
        .build();

Map<String, Object> personMap = new ProtoMapper().wrap(person);
String json = new ObjectMapper().writeValueAsString(personMap);

Convert Protocol Buffer Bytes to a JSON String

Descriptor personDescriptor = Person.getDescriptor();
ByteBuffer personProtoBytes = ...;
Map<String, Object> personMap = ProtoReader.read(personProtoBytes, personDescriptor);
String json = new ObjectMapper().writeValueAsString(personMap);