001/* ManagementPermission.java - Permissions for system management.
002   Copyright (C) 2006 Free Software Foundation
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038package java.lang.management;
039
040import 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 */
078public 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}
132