001 // This file is part of the Attempto Java Packages. 002 // Copyright 2008-2009, Attempto Group, University of Zurich (see http://attempto.ifi.uzh.ch). 003 // 004 // The Attempto Java Packages is free software: you can redistribute it and/or modify it under the 005 // terms of the GNU Lesser General Public License as published by the Free Software Foundation, 006 // either version 3 of the License, or (at your option) any later version. 007 // 008 // The Attempto Java Packages is distributed in the hope that it will be useful, but WITHOUT ANY 009 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 // PURPOSE. See the GNU Lesser General Public License for more details. 011 // 012 // You should have received a copy of the GNU Lesser General Public License along with the Attempto 013 // Java Packages. If not, see http://www.gnu.org/licenses/. 014 015 package ch.uzh.ifi.attempto.ape; 016 017 /** 018 * This class contains Prolog-related utility methods. 019 * 020 * @author Tobias Kuhn 021 */ 022 public class PrologUtils { 023 024 private PrologUtils() {} // no instances allowed 025 026 /** 027 * Escapes the string according to Prolog escaping rules and puts it into single quotes. 028 * 029 * @param s The string to be escaped. 030 * @return The escaped string. 031 */ 032 public static String escape(String s) { 033 if (s == null) { 034 return "''"; 035 } 036 return "'" + s.replace("\\", "\\\\").replace("'", "\\'") + "'"; 037 } 038 039 }