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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.joran.action;
15  
16  import ch.qos.logback.classic.spi.LoggerContextListener;
17  import ch.qos.logback.core.spi.ContextAware;
18  import ch.qos.logback.core.spi.LifeCycle;
19  import org.xml.sax.Attributes;
20  
21  import ch.qos.logback.classic.LoggerContext;
22  import ch.qos.logback.core.joran.action.Action;
23  import ch.qos.logback.core.joran.spi.ActionException;
24  import ch.qos.logback.core.joran.spi.InterpretationContext;
25  import ch.qos.logback.core.util.OptionHelper;
26  
27  public class LoggerContextListenerAction extends Action {
28      boolean inError = false;
29      LoggerContextListener lcl;
30  
31      @Override
32      public void begin(InterpretationContext ec, String name, Attributes attributes) throws ActionException {
33  
34          inError = false;
35  
36          String className = attributes.getValue(CLASS_ATTRIBUTE);
37          if (OptionHelper.isEmpty(className)) {
38              addError("Mandatory \"" + CLASS_ATTRIBUTE + "\" attribute not set for <loggerContextListener> element");
39              inError = true;
40              return;
41          }
42  
43          try {
44              lcl = (LoggerContextListener) OptionHelper.instantiateByClassName(className, LoggerContextListener.class, context);
45  
46              if (lcl instanceof ContextAware) {
47                  ((ContextAware) lcl).setContext(context);
48              }
49  
50              ec.pushObject(lcl);
51              addInfo("Adding LoggerContextListener of type [" + className + "] to the object stack");
52  
53          } catch (Exception oops) {
54              inError = true;
55              addError("Could not create LoggerContextListener of type " + className + "].", oops);
56          }
57      }
58  
59      @Override
60      public void end(InterpretationContext ec, String name) throws ActionException {
61          if (inError) {
62              return;
63          }
64          Object o = ec.peekObject();
65  
66          if (o != lcl) {
67              addWarn("The object on the top the of the stack is not the LoggerContextListener pushed earlier.");
68          } else {
69              if (lcl instanceof LifeCycle) {
70                  ((LifeCycle) lcl).start();
71                  addInfo("Starting LoggerContextListener");
72              }
73              ((LoggerContext) context).addListener(lcl);
74              ec.popObject();
75          }
76      }
77  
78  }