private static Document createDocument(String string, Position[] positions) throws IllegalArgumentException {
Document doc= new Document(string);
try {
if (positions != null) {
doc.addPositionCategory(POS_CATEGORY);
doc.addPositionUpdater(new DefaultPositionUpdater(POS_CATEGORY) {
protected boolean notDeleted() {
if (fOffset < fPosition.offset && (fPosition.offset + fPosition.length < fOffset + fLength)) {
fPosition.offset= fOffset + fLength; // deleted positions: set to end of remove
return false;