public <SerializationT extends Serialization> boolean hasParserForParameters(
      SerializationT serializedParameters) {
    ParserIndex index =
        new ParserIndex(
            serializedParameters.getClass(), serializedParameters.getObjectIdentifier());
    return parametersParserMap.containsKey(index);
  }
Returns true if a parser for this {@code serializedKey} has been registered.
java_src/src/main/java/com/google/crypto/tink/internal/SerializationRegistry.java