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  package ch.qos.logback.core.joran.conditional;
15  
16  /**
17   * <p>A condition evaluated during Joran conditional processing.</p>
18   *
19   * <p>Implementations of this interface encapsulate a boolean test that
20   * determines whether a conditional block in a Joran configuration should
21   * be processed.</p>
22   *
23   * <p>Typical implementations evaluate configuration state, environment
24   * variables, or other runtime properties.</p>
25   *
26   * @since 0.9.20
27   * @author Ceki G&uuml;lc&uuml;
28   */
29  public interface Condition {
30  
31      /**
32       * Evaluate the condition.
33       *
34       * @return {@code true} if the condition is satisfied and the associated
35       *         conditional block should be activated; {@code false} otherwise
36       */
37      boolean evaluate();
38  }