public static int getFieldTag(Class<? extends Message> protoClass, String fieldName) {
if (protoClass == null) {
throw new RuntimeException("protoClass should not be null");
}
try {
Field field = protoClass.getField(fieldName);
ProtoField protoField = field.getAnnotation(ProtoField.class);
if (protoField == null) {
throw new RuntimeException(
"the field do not have ProtoField annotation, " + "field name=" + fieldName);
}
return protoField.tag();
} catch (NoSuchFieldException e) {
throw new RuntimeException(e);
}
}
