Map<ProtoMember, Object> canonicalizeOption(
Linker linker, ProtoType extensionType, OptionElement option) {
Type type = linker.get(extensionType);
if (!(type instanceof MessageType)) {
return null; // No known extensions for the given extension type.
}
MessageType messageType = (MessageType) type;
String[] path;
Field field = messageType.field(option.name());
if (field != null) {
// This is an option declared by descriptor.proto.
path = new String[] {option.name()};
} else {
// This is an option declared by an extension.
Map<String, Field> extensionsForType = messageType.extensionFieldsMap();
path = resolveFieldPath(option.name(), extensionsForType.keySet());
String packageName = linker.packageName();
if (path == null && packageName != null) {
// If the path couldn't be resolved, attempt again by prefixing it with the package name.
path = resolveFieldPath(packageName + "." + option.name(), extensionsForType.keySet());
}
if (path == null) {
return null; // Unable to find the root of this field path.
}
field = extensionsForType.get(path[0]);
}
Map<ProtoMember, Object> result = new LinkedHashMap<>();
Map<ProtoMember, Object> last = result;
ProtoType lastProtoType = messageType.type();
for (int i = 1; i < path.length; i++) {
Map<ProtoMember, Object> nested = new LinkedHashMap<>();
last.put(ProtoMember.get(lastProtoType, field), nested);
lastProtoType = field.type();
last = nested;
field = linker.dereference(field, path[i]);
if (field == null) {
return null; // Unable to dereference this path segment.
}
}
last.put(
ProtoMember.get(lastProtoType, field), canonicalizeValue(linker, field, option.value()));
return result;
}
private Object canonicalizeValue(Linker linker, Field context, Object value) {
if (value instanceof OptionElement) {
ImmutableMap.Builder<ProtoMember, Object> result = ImmutableMap.builder();
OptionElement option = (OptionElement) value;
Field field = linker.dereference(context, option.name());
if (field == null) {
linker.addError("unable to resolve option %s on %s", option.name(), context.type());
} else {
ProtoMember protoMember = ProtoMember.get(context.type(), field);
result.put(protoMember, canonicalizeValue(linker, field, option.value()));
}
return coerceValueForField(context, result.build());
}
if (value instanceof Map) {
ImmutableMap.Builder<ProtoMember, Object> result = ImmutableMap.builder();
for (Map.Entry<?, ?> entry : ((Map<?, ?>) value).entrySet()) {
String name = (String) entry.getKey();
Field field = linker.dereference(context, name);
if (field == null) {
linker.addError("unable to resolve option %s on %s", name, context.type());
} else {
ProtoMember protoMember = ProtoMember.get(context.type(), field);
result.put(protoMember, canonicalizeValue(linker, field, entry.getValue()));
}
}
return coerceValueForField(context, result.build());
}
if (value instanceof List) {
ImmutableList.Builder<Object> result = ImmutableList.builder();
for (Object element : (List<?>) value) {
result.addAll((List) canonicalizeValue(linker, context, element));
}
return coerceValueForField(context, result.build());
}
if (value instanceof String) {
return coerceValueForField(context, value);
}
throw new IllegalArgumentException("Unexpected option value: " + value);
}