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.classic.pattern;
15
16 import ch.qos.logback.classic.PatternLayout;
17 import ch.qos.logback.classic.spi.ILoggingEvent;
18 import ch.qos.logback.core.CoreConstants;
19
20 /**
21 * Always returns an empty string.
22 * <p>
23 * This converter is useful to pretend that the converter chain for
24 * PatternLayout actually handles exceptions, when in fact it does not. By
25 * adding %nopex to the conversion pattern, the user can bypass the automatic
26 * addition of %ex conversion pattern for patterns which do not contain a
27 * converter handling exceptions.
28 *
29 * <p>
30 * Users can ignore the existence of this converter, unless they want to
31 * suppress the automatic printing of exceptions by {@link PatternLayout}.
32 *
33 * @author Ceki Gülcü
34 */
35 public class NopThrowableInformationConverter extends ThrowableHandlingConverter {
36
37 public String convert(ILoggingEvent event) {
38 return CoreConstants.EMPTY_STRING;
39 }
40
41 }