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.core.pattern;
15  
16  /**
17   * Testing purposes only
18   */
19  public class ExceptionalConverter extends DynamicConverter<Object> {
20  
21      public String convert(Object event) {
22          if (!isStarted()) {
23              throw new IllegalStateException("this converter must be started before use");
24          }
25          return "";
26      }
27  }