The Java SqlCursor Class

 
    public  class SqlCursor implements Iterator<SqlTuple>, java.io.Closeable
    {
        /**
        * Check if there is a next tuple.
        */
        public boolean hasNext() 
        {
            return hasNext(id);
        }
 
        /**
        * Get next tuple
        */
        public SqlTuple next() 
        {
            return new SqlTuple(rs, next(id));
        }
         
        public void remove() 
        {
            throw new UnsupportedOperationException("SqlCursor.remove");
        }
 
        /**
        * Close the iterator
        */
        public void close() 
        {
            if (id != 0) 
            {
                rs.detachCursor(this);
                close(id);
                id = 0;
            }
        }
 
        protected void finalize() 
        {
            close();
        }
 
        SqlCursor(SqlResultSet resultSet, long cursor) 
        {
            rs = resultSet;
            id = cursor;
        }
         
        private SqlResultSet rs;
        private long id;
        private native boolean hasNext(long id);
        private native long next(long id);
        private native void close(long id);
    };