001    /* ManagementPermission.java - Permissions for system management.
002       Copyright (C) 2006 Free Software Foundation
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    package java.lang.management;
039    
040    import java.security.BasicPermission;
041    
042    /**
043     * <p>
044     * Represents the permission to view or modify the data
045     * which forms part of the system management interfaces.
046     * Calls to methods of the system management beans,
047     * provided by the {@link ManagementFactory}, may perform
048     * checks against the current {@link java.lang.SecurityManager}
049     * (if any) before allowing the operation to proceed.
050     * Instances of this object are supplied to the
051     * {@link java.lang.SecurityManager} in order to perform
052     * these checks.  It is not normal for instances of this
053     * class to be created outside the use of the
054     * {@link java.lang.SecurityManager}.
055     * </p>
056     * <p>
057     * This object can represent two types of management
058     * permission:
059     * </p>
060     * <ul>
061     * <li><strong>monitor</strong> &mdash; this allows access
062     * to information such as the arguments supplied to the
063     * virtual machine, the currently loaded classes and the
064     * stack traces of running threads.  Malicious code may
065     * use this to obtain information about the system and
066     * exploit any vulnerabilities found.</li>
067     * <li><strong>control</strong> &mdash; this allows the
068     * information stored by the management beans to be altered.
069     * For example, additional debugging information (such
070     * as class loading traces) may be turned on or memory
071     * usage limits changed.  Malicious code could use
072     * this to alter the behaviour of the system.</li>
073     * </ul>
074     *
075     * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
076     * @since 1.5
077     */
078    public final class ManagementPermission
079      extends BasicPermission
080    {
081    
082      /**
083       * Compatible with JDK 1.5
084       */
085      private static final long serialVersionUID = 1897496590799378737L;
086    
087      /**
088       * Constructs a new <code>ManagementPermission</code>
089       * for one of the two permission targets, "monitor"
090       * and "control".
091       *
092       * @param name the name of the permission this instance
093       *             should represent; either "monitor" or
094       *             "control".
095       * @throws IllegalArgumentException if the name is not
096       *                                  either "monitor"
097       *                                  or "control".
098       */
099      public ManagementPermission(String name)
100      {
101        super(name);
102        if (!(name.equals("monitor") || name.equals("control")))
103          throw new IllegalArgumentException("Invalid permission.");
104      }
105    
106      /**
107       * Constructs a new <code>ManagementPermission</code>
108       * for one of the two permission targets, "monitor"
109       * and "control".  Actions are not supported, so
110       * this value should be either <code>null</code>
111       * or the empty string.
112       *
113       * @param name the name of the permission this instance
114       *             should represent; either "monitor" or
115       *             "control".
116       * @param actions either <code>null</code> or the
117       *                empty string.
118       * @throws IllegalArgumentException if the name is not
119       *                                  either "monitor"
120       *                                  or "control", or
121       *                                  a value for actions
122       *                                  is specified.
123       */
124      public ManagementPermission(String name, String actions)
125      {
126        this(name);
127        if (!(actions == null || actions.equals("")))
128          throw new IllegalArgumentException("Invalid actions.");
129      }
130    
131    }