1 /**
2 * Logback: the reliable, generic, fast and flexible logging framework.
3 * Copyright (C) 1999-2011, 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
22 /**
23 * Always returns an empty string.
24 * <p>
25 * This converter is useful to pretend that the converter chain for
26 * PatternLayout actually handles exceptions, when in fact it does not.
27 * By adding %nopex to the conversion pattern, the user can bypass
28 * the automatic addition of %ex conversion pattern for patterns
29 * which do not contain a converter handling exceptions.
30 *
31 * <p>Users can ignore the existence of this converter, unless they
32 * want to suppress the automatic printing of exceptions by
33 * {@link PatternLayout}.
34 *
35 * @author Ceki Gülcü
36 */
37 public class NopThrowableInformationConverter extends ThrowableHandlingConverter {
38
39 public String convert(ILoggingEvent event) {
40 return CoreConstants.EMPTY_STRING;
41 }
42
43 }