public static boolean isStopWord(String word) {
if (word == null) {
return false;
}
if (searchTree == null) {
initSearchTree();
}
return searchTree.getValueForExactKey(word.toLowerCase()) != null;
}
private static void initSearchTree() {
searchTree = new ConcurrentRadixTree<Boolean>(new DefaultCharArrayNodeFactory());
for (String s : STOP_WORDS) {
searchTree.put(s, Boolean.TRUE);
}
}