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.classic.pattern; 015 016import ch.qos.logback.classic.PatternLayout; 017import ch.qos.logback.classic.spi.ILoggingEvent; 018import ch.qos.logback.core.CoreConstants; 019 020/** 021 * Always returns an empty string. 022 * <p> 023 * This converter is useful to pretend that the converter chain for 024 * PatternLayout actually handles exceptions, when in fact it does not. By 025 * adding %nopex to the conversion pattern, the user can bypass the automatic 026 * addition of %ex conversion pattern for patterns which do not contain a 027 * converter handling exceptions. 028 * 029 * <p> 030 * Users can ignore the existence of this converter, unless they want to 031 * suppress the automatic printing of exceptions by {@link PatternLayout}. 032 * 033 * @author Ceki Gülcü 034 */ 035public class NopThrowableInformationConverter extends ThrowableHandlingConverter { 036 037 public String convert(ILoggingEvent event) { 038 return CoreConstants.EMPTY_STRING; 039 } 040 041}