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