/**
* Recursively checks whether the specified class uses any Protocol Buffers fields that cannot be
* deterministically encoded.
*
* @throws NonDeterministicException if the object cannot be encoded deterministically.
*/
static void verifyDeterministic(ProtoCoder<?> coder) throws NonDeterministicException {
Class<? extends Message> message = coder.getMessageType();
ExtensionRegistry registry = coder.getExtensionRegistry();
Set<Descriptor> descriptors = getRecursiveDescriptorsForClass(message, registry);
for (Descriptor d : descriptors) {
for (FieldDescriptor fd : d.getFields()) {
// If there is a transitively reachable Protocol Buffers map field, then this object cannot
// be encoded deterministically.
if (fd.isMapField()) {
String reason =
String.format(
"Protocol Buffers message %s transitively includes Map field %s (from file %s)."
+ " Maps cannot be deterministically encoded.",
message.getName(), fd.getFullName(), fd.getFile().getFullName());
throw new NonDeterministicException(coder, reason);
}
}
}
}
