Logback: the reliable, generic, fast and flexible logging framework.
Copyright (C) 1999-2015, QOS.ch. All rights reserved.
This program and the accompanying materials are dual-licensed under
either the terms of the Eclipse Public License v1.0 as published by
the Eclipse Foundation
  or (per the licensee's choosing)
under the terms of the GNU Lesser General Public License version 2.1
as published by the Free Software Foundation.
/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.pattern;

import ch.qos.logback.classic.PatternLayout;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.CoreConstants;

Always returns an empty string.

This converter is useful to pretend that the converter chain for
PatternLayout actually handles exceptions, when in fact it does not.
By adding %nopex to the conversion pattern, the user can bypass
the automatic addition of %ex conversion pattern for patterns 
which do not contain a converter handling exceptions.
Users can ignore the existence of this converter, unless they want to suppress the automatic printing of exceptions by PatternLayout. 
Author:
Ceki Gülcü/**
 * Always returns an empty string.
 * <p>
 * This converter is useful to pretend that the converter chain for
 * PatternLayout actually handles exceptions, when in fact it does not.
 * By adding %nopex to the conversion pattern, the user can bypass
 * the automatic addition of %ex conversion pattern for patterns 
 * which do not contain a converter handling exceptions.
 * 
 * <p>Users can ignore the existence of this converter, unless they
 * want to suppress the automatic printing of exceptions by 
 * {@link PatternLayout}.
 * 
 * @author Ceki G&uuml;lc&uuml;
 */
public class NopThrowableInformationConverter extends ThrowableHandlingConverter {

    public String convert(ILoggingEvent event) {
        return CoreConstants.EMPTY_STRING;
    }

}