001/**
002 * Logback: the reliable, generic, fast and flexible logging framework.
003 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
004 *
005 * This program and the accompanying materials are dual-licensed under
006 * either the terms of the Eclipse Public License v1.0 as published by
007 * the Eclipse Foundation
008 *
009 *   or (per the licensee's choosing)
010 *
011 * under the terms of the GNU Lesser General Public License version 2.1
012 * as published by the Free Software Foundation.
013 */
014package ch.qos.logback.core.pattern.util;
015
016/**
017 * This implementation is intended for use in PatternLayout.
018 *
019 * @author Ceki Gülcü
020 */
021public class RestrictedEscapeUtil implements IEscapeUtil {
022
023    public void escape(String escapeChars, StringBuffer buf, char next, int pointer) {
024        if (escapeChars.indexOf(next) >= 0) {
025            buf.append(next);
026        } else {
027            // restitute the escape char (because it was consumed
028            // before this method was called).
029            buf.append("\\");
030            // restitute the next character
031            buf.append(next);
032        }
033    }
034
035}