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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.access.pattern;
15  
16  import ch.qos.logback.access.spi.IAccessEvent;
17  import ch.qos.logback.core.Context;
18  import ch.qos.logback.core.pattern.Converter;
19  import ch.qos.logback.core.pattern.ConverterUtil;
20  import ch.qos.logback.core.pattern.PostCompileProcessor;
21  
22  public class EnsureLineSeparation implements PostCompileProcessor<IAccessEvent> {
23  
24      /**
25       * Add a line separator converter so that access event appears on a separate
26       * line.
27       */
28      @Override
29      public void process(Context context, Converter<IAccessEvent> head) {
30          if (head == null)
31              throw new IllegalArgumentException("Empty converter chain");
32  
33          // if head != null, then tail != null as well
34          Converter<IAccessEvent> tail = ConverterUtil.findTail(head);
35          Converter<IAccessEvent> newLineConverter = new LineSeparatorConverter();
36          if (!(tail instanceof LineSeparatorConverter)) {
37              tail.setNext(newLineConverter);
38          }
39      }
40  }