public Extensions create() {
        Extensions extension = null;
        if (!has()) {
            extension = rTree.create(featureDao.getTable());
            if (progress != null) {
                progress.addProgress(count());
            }
        }
        return extension;
    }
public Extensions create() {
        Extensions extension = null;
        if (!has()) {
            extension = rTree.create(featureDao.getTable());
            if (progress != null) {
                progress.addProgress(count());
            }
        }
        return extension;
    }
public Extensions create ( ) { Extensions extension = null ; if ( ! has ( ) ) { extension = rTree . create ( featureDao . getTable ( ) ) ; if ( progress != null ) { progress . addProgress ( count ( ) ) ; } } return extension ; }
Create the RTree extension for the feature table

@return extension
Create the RTree extension for the feature table