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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.filter;
15  
16  import ch.qos.logback.classic.Level;
17  import ch.qos.logback.classic.spi.ILoggingEvent;
18  import ch.qos.logback.core.filter.Filter;
19  import ch.qos.logback.core.spi.FilterReply;
20  
21  /**
22   * Filters events below the threshold level.
23   * 
24   * Events with a level below the specified
25   * level will be denied, while events with a level
26   * equal or above the specified level will trigger a
27   * FilterReply.NEUTRAL result, to allow the rest of the
28   * filter chain process the event.
29   * 
30   * For more information about filters, please refer to the online manual at
31   * http://logback.qos.ch/manual/filters.html#thresholdFilter
32   *
33   * @author Sébastien Pennec
34   */
35  public class ThresholdFilter extends Filter<ILoggingEvent> {
36  
37      Level level;
38  
39      @Override
40      public FilterReply decide(ILoggingEvent event) {
41          if (!isStarted()) {
42              return FilterReply.NEUTRAL;
43          }
44  
45          if (event.getLevel().isGreaterOrEqual(level)) {
46              return FilterReply.NEUTRAL;
47          } else {
48              return FilterReply.DENY;
49          }
50      }
51  
52      public void setLevel(String level) {
53          this.level = Level.toLevel(level);
54      }
55  
56      public void start() {
57          if (this.level != null) {
58              super.start();
59          }
60      }
61  }