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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 java.util.Arrays;
17  
18  import ch.qos.logback.access.spi.IAccessEvent;
19  import ch.qos.logback.core.util.OptionHelper;
20  
21  public class RequestParameterConverter extends AccessConverter {
22  
23      String key;
24  
25      @Override
26      public void start() {
27          key = getFirstOption();
28          if (OptionHelper.isEmpty(key)) {
29              addWarn("Missing key for the request parameter");
30          } else {
31              super.start();
32          }
33      }
34  
35      @Override
36      public String convert(IAccessEvent accessEvent) {
37          if (!isStarted()) {
38              return "INACTIVE_REQUEST_PARAM_CONV";
39          }
40  
41          String[] paramArray = accessEvent.getRequestParameter(key);
42          if (paramArray.length == 1) {
43              return paramArray[0];
44          } else {
45              // for an array string {"a", "b"} named 'sa', Array.toString(sa) returns the string
46              // "[a, b]".
47              return Arrays.toString(paramArray);
48          }
49      }
50  
51  }