1   /*
2    * Logback: the reliable, generic, fast and flexible logging framework.
3    * Copyright (C) 1999-2026, 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 v2.0 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  
15  package ch.qos.logback.core.boolex;
16  
17  public class IsPropertyNullCondition  extends PropertyConditionBase {
18  
19      String key;
20  
21      public void start() {
22          if (key == null) {
23              addError("In IsPropertyNullCondition 'key' parameter cannot be null");
24              return;
25          }
26          super.start();
27      }
28  
29  
30      public String getKey() {
31          return key;
32      }
33  
34      public void setKey(String key) {
35          this.key = key;
36      }
37  
38      @Override
39      public boolean evaluate() {
40          return isNull(key);
41      }
42  }