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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.classic.pattern;
15  
16  import java.util.Map;
17  
18  import ch.qos.logback.classic.spi.ILoggingEvent;
19  import ch.qos.logback.classic.spi.LoggerContextVO;
20  
21  public final class PropertyConverter extends ClassicConverter {
22  
23      String key;
24  
25      public void start() {
26          String optStr = getFirstOption();
27          if (optStr != null) {
28              key = optStr;
29              super.start();
30          }
31      }
32  
33      public String convert(ILoggingEvent event) {
34          if (key == null) {
35              return "Property_HAS_NO_KEY";
36          } else {
37              LoggerContextVO lcvo = event.getLoggerContextVO();
38              Map<String, String> map = lcvo.getPropertyMap();
39              String val = map.get(key);
40              if (val != null) {
41                  return val;
42              } else {
43                  return System.getProperty(key);
44              }
45          }
46      }
47  }