1 /*
   2  * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.security.util;
  27 
  28 /**
  29  * This class implements an event model with services for reporter and listener.
  30  * Reporter uses report() method to generate an event.
  31  * Listener uses setReportListener() to register for listening to an event,
  32  * and uses clearReportListener() to unregister a listening session.
  33  * Listener should implement the event handling of the Reporter interface.
  34  */
  35 public final class Event {
  36     private Event() {}
  37 
  38     public enum ReporterCategory {
  39         CRLCHECK(),
  40         POSIXPERMS();
  41 
  42         private Reporter reporter;
  43     }
  44 
  45     public interface Reporter {
  46         public void handle(String type, Object... args);
  47     }
  48 
  49     public static void setReportListener(ReporterCategory cat, Reporter re) {
  50         cat.reporter = re;
  51     }
  52 
  53     public static void clearReportListener(ReporterCategory cat) {
  54         cat.reporter = null;
  55     }
  56 
  57     public static void report(ReporterCategory cat, String type, Object... args) {
  58         Reporter currentReporter = cat.reporter;
  59 
  60         if (currentReporter != null) {
  61             currentReporter.handle(type, args);
  62         }
  63     }
  64 }