1 /*
   2  * Copyright (c) 2003, 2008, 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 java.util.logging;
  27 
  28 import java.util.Enumeration;
  29 import java.util.List;
  30 import java.util.ArrayList;
  31 
  32 /**
  33  * Logging is the implementation class of LoggingMXBean.
  34  *
  35  * The <tt>LoggingMXBean</tt> interface provides a standard
  36  * method for management access to the individual
  37  * java.util.Logger objects available at runtime.
  38  *
  39  * @author Ron Mann
  40  * @author Mandy Chung
  41  * @since 1.5
  42  *
  43  * @see javax.management
  44  * @see java.util.Logger
  45  * @see java.util.LogManager
  46  */
  47 class Logging implements LoggingMXBean {
  48 
  49     private static LogManager logManager = LogManager.getLogManager();
  50 
  51     /** Constructor of Logging which is the implementation class
  52      *  of LoggingMXBean.
  53      */
  54     Logging() {
  55     }
  56 
  57     public List<String> getLoggerNames() {
  58         Enumeration loggers = logManager.getLoggerNames();
  59         ArrayList<String> array = new ArrayList<>();
  60 
  61         for (; loggers.hasMoreElements();) {
  62             array.add((String) loggers.nextElement());
  63         }
  64         return array;
  65     }
  66 
  67     private static String EMPTY_STRING = "";
  68     public String getLoggerLevel(String loggerName) {
  69         Logger l = logManager.getLogger(loggerName);
  70         if (l == null) {
  71             return null;
  72         }
  73 
  74         Level level = l.getLevel();
  75         if (level == null) {
  76             return EMPTY_STRING;
  77         } else {
  78             return level.getName();
  79         }
  80     }
  81 
  82     public void setLoggerLevel(String loggerName, String levelName) {
  83         if (loggerName == null) {
  84             throw new NullPointerException("loggerName is null");
  85         }
  86 
  87         Logger logger = logManager.getLogger(loggerName);
  88 
  89         if (logger == null) {
  90             throw new IllegalArgumentException("Logger " + loggerName +
  91                 "does not exist");
  92         }
  93 
  94         Level level = null;
  95         if (levelName != null) {
  96             // parse will throw IAE if logLevel is invalid
  97             level = Level.parse(levelName);
  98         }
  99 
 100         logger.setLevel(level);
 101     }
 102 
 103     public String getParentLoggerName( String loggerName ) {
 104         Logger l = logManager.getLogger( loggerName );
 105         if (l == null) {
 106             return null;
 107         }
 108 
 109         Logger p = l.getParent();
 110         if (p == null) {
 111             // root logger
 112             return EMPTY_STRING;
 113         } else {
 114             return p.getName();
 115         }
 116     }
 117 }