private void errorStateChange(final FragmentState current, final FragmentState target) {
final String msg = "%s: Invalid state transition %s --> %s";
throw new StateTransitionException(
String.format(msg, fragmentName, current.name(), target.name()));
}
private void warnStateChange(final FragmentState current, final FragmentState target) {
logger.warn(
fragmentName + ": Ignoring unexpected state transition {} --> {}",
current.name(),
target.name());
}