public OptionGroup findOptionGroup(String subKey) {
int pos = subKey.indexOf('.');
if (pos == -1) {
// check if the key specifies a group or a key: if the group is not known, assume its an
// option key
if (subGroups.containsKey(subKey)) {
return subGroups.get(subKey);
} else {
return this;
}
}
OptionGroup group = subGroups.get(subKey.substring(0, pos));
if (group == null) {
// no subgroup by that key, return this group
return this;
}
return group.findOptionGroup(subKey.substring(pos + 1));
}
