AbstractDocument doc = (AbstractDocument) context.getDocument();
doc.readLock();
try {
TokenHierarchy th = TokenHierarchy.get(doc);
TokenSequence ts = th.tokenSequence();
//System.out.println("--------------------");
ret = findPaar(ts, context.getSearchOffset(), originToken, matchToken, searchForward);
} finally {
((AbstractDocument) context.getDocument()).readUnlock();
}