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1   /**
2    * Logback: the reliable, generic, fast and flexible logging framework.
3    * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
4    *
5    * This program and the accompanying materials are dual-licensed under
6    * either the terms of the Eclipse Public License v1.0 as published by
7    * the Eclipse Foundation
8    *
9    *   or (per the licensee's choosing)
10   *
11   * under the terms of the GNU Lesser General Public License version 2.1
12   * as published by the Free Software Foundation.
13   */
14  package ch.qos.logback.core.pattern.util;
15  
16  /**
17   * This implementation is intended for use in PatternLayout.
18   *
19   * @author Ceki Gülcü
20   */
21  public class RestrictedEscapeUtil implements IEscapeUtil {
22  
23      public void escape(String escapeChars, StringBuffer buf, char next, int pointer) {
24          if (escapeChars.indexOf(next) >= 0) {
25              buf.append(next);
26          } else {
27              // restitute the escape char (because it was consumed
28              // before this method was called).
29              buf.append("\\");
30              // restitute the next character
31              buf.append(next);
32          }
33      }
34  
35  }