/** Given an input string, level, and optionally a tag length, find a matching prefix. */
private PrefixMatch findPrefixMatch(
String input, TagLengthList tagLength, LevelTypeList level_type) {
List<PrefixMatch> match_list = new ArrayList<PrefixMatch>();
PrefixTree<PrefixMatch> tree = prefix_tree_map.get(level_type);
assert tree != null;
List<PrefixMatch> list = tree.search(input);
if (!list.isEmpty()) {
if (tagLength == null) match_list.addAll(list);
else {
for (PrefixMatch match : list)
if (match.getScheme().getTagLength() == tagLength) match_list.add(match);
}
}
if (match_list.isEmpty())
throw new TDTException("No schemes or levels matched the input value");
else if (match_list.size() > 1)
throw new TDTException("More than one scheme/level matched the input value");
else return match_list.get(0);
}
/** initialise various indices */
private void initFromTDT(EpcTagDataTranslation tdt) {
Scheme[] scheme = tdt.getScheme();
for (Scheme ss : scheme) {
// create an index so that we can find a scheme based on tag length
for (Level level : ss.getLevel()) {
String s = level.getPrefixMatch();
if (s != null) {
// insert into prefix tree according to level type.
PrefixTree<PrefixMatch> prefix_tree = prefix_tree_map.get(level.getType());
if (prefix_tree == null) {
prefix_tree = new PrefixTree<PrefixMatch>();
prefix_tree_map.put(level.getType(), prefix_tree);
}
prefix_tree.insert(s, new PrefixMatch(ss, level));
}
}
}
}