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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.util.OptionHelper;
18  
19  public class RequestAttributeConverter extends AccessConverter {
20  
21      String key;
22  
23      @Override
24      public void start() {
25          key = getFirstOption();
26          if (OptionHelper.isEmpty(key)) {
27              addWarn("Missing key for the request attribute");
28          } else {
29              super.start();
30          }
31      }
32  
33      @Override
34      public String convert(IAccessEvent accessEvent) {
35          if (!isStarted()) {
36              return "INACTIVE_REQUEST_ATTRIB_CONV";
37          }
38  
39          return accessEvent.getAttribute(key);
40      }
41  
42  }