Here you can find the source of shortenPrefix(String prefix)
private static String shortenPrefix(String prefix)
//package com.java2s; /*/*from w w w. j a va 2 s . co m*/ Copyright (C) 2012 Rick Brown This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ public class Main { private static String shortenPrefix(String prefix) { String result = null; int idx = prefix.lastIndexOf('/'); if (idx > 0) { result = prefix.substring(0, idx); } return result; } }