allpermission.java

来自「gcc3.2.1源代码」· Java 代码 · 共 135 行

/* AllPermission.java -- Permission to do anything
   Copyright (C) 1998, 2001 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */

package java.security;

/**
 * This class is a permission that implies all other permissions.  Granting
 * this permission effectively grants all others.  Extreme caution should
 * be exercised in granting this permission.
 *
 * @version 0.0
 *
 * @author Aaron M. Renn ([e-mail])
 */
public final class AllPermission extends Permission
{
  /**
   * This method initializes a new instance of <code>AllPermission</code>.  It
   * performs no actions.
   */
  public AllPermission()
  {
    super("all");
  }

  /**
   * This method initializes a new instance of <code>AllPermission</code>.  The
   * arguments passed to this method are used to set internal field for the
   * permission name.  However, these are not used in 
   * determining the actual permissions granted.  This class always will
   * return <code>true</code> in its implies method.
   *
   * @param name The name of this permission.
   * @param actions The action list for this permission - ignored in this class.
   */
  public AllPermission(String name, String actions)
  {
    super(name);
  }

  /**
   * This method always returns <code>true</code> to indicate that this
   * permission always implies that any other permission is also granted.
   *
   * @param perm The <code>Permission</code> to test against - ignored in this class.
   *
   * @return Always returns <code>true</code>
   */
  public boolean implies(Permission perm)
  {
    return (true);
  }

  /**
   * This method tests this class for equality against another <code>Object</code>.
   * This will return <code>true</code> if and only if the specified 
   * <code>Object</code> is an instance of <code>AllPermission</code>.
   *
   * @param obj The <code>Object</code> to test for equality to this object
   */
  public boolean equals(Object obj)
  {
    if (obj instanceof AllPermission)
      return (true);

    return (false);
  }

  /**
   * This method returns a hash code for this object.
   *
   * @return A hash value for this object.
   */
  public int hashCode()
  {
    return (System.identityHashCode(this));
  }

  /**
   * This method returns the list of actions associated with this object.
   * This will always be the empty string ("") for this class.
   *
   * @return The action list.
   */
  public String getActions()
  {
    return ("");
  }

  /**
   * This method returns a new instance of <code>PermissionCollection</code>
   * suitable for holding instance of <code>AllPermission</code>.
   *
   * @return A new <code>PermissionCollection</code>.
   */
  public PermissionCollection newPermissionCollection()
  {
    return (null);
  }
}