/**
 * 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.core.pattern;

import ch.qos.logback.core.pattern.DynamicConverter;

public class ExceptionalConverter extends DynamicConverter {

    public String convert(Object event) {
        if (!isStarted()) {
            throw new IllegalStateException("this converter must be started before use");
        }
        return "";
    }

}
