| /* AllPermission.java -- Permission to do anything |
| Copyright (C) 1998, 2001, 2002, 2004, 2005 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; |
| |
| import gnu.java.util.EmptyEnumeration; |
| |
| import java.util.Collections; |
| import java.util.Enumeration; |
| |
| /** |
| * 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. |
| * |
| * @author Aaron M. Renn (arenn@urbanophile.com) |
| * @author Eric Blake (ebb9@email.byu.edu) |
| * @see AccessController |
| * @see Permissions |
| * @see SecurityManager |
| * @since 1.1 |
| * @status updated to 1.4 |
| */ |
| public final class AllPermission extends Permission |
| { |
| /** |
| * Compatible with JDK 1.1+. |
| */ |
| private static final long serialVersionUID = -2916474571451318075L; |
| |
| /** |
| * Create a new AllPermission object. |
| */ |
| public AllPermission() |
| { |
| super("*"); |
| } |
| |
| /** |
| * Create a new AllPermission object. The parameters are ignored, as all |
| * permission implies ALL PERMISSION. |
| * |
| * @param name ignored |
| * @param actions ignored |
| */ |
| public AllPermission(String name, String actions) |
| { |
| super("*"); |
| } |
| |
| /** |
| * This method always returns <code>true</code> to indicate that this |
| * permission always implies that any other permission is also granted. |
| * |
| * @param perm ignored |
| * @return true, the permission is implied |
| */ |
| public boolean implies(Permission perm) |
| { |
| return true; |
| } |
| |
| /** |
| * Checks an object for equality. All AllPermissions are equal. |
| * |
| * @param obj the <code>Object</code> to test for equality |
| */ |
| public boolean equals(Object obj) |
| { |
| return obj instanceof AllPermission; |
| } |
| |
| /** |
| * This method returns a hash code for this object. This returns 1. |
| * |
| * @return a hash value for this object |
| */ |
| public int hashCode() |
| { |
| return 1; |
| } |
| |
| /** |
| * 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 ""; |
| } |
| |
| /** |
| * Returns a PermissionCollection which can hold AllPermission. |
| * |
| * @return a permission collection |
| */ |
| public PermissionCollection newPermissionCollection() |
| { |
| return new AllPermissionCollection(); |
| } |
| |
| /** |
| * Implements AllPermission.newPermissionCollection, and obeys serialization |
| * of JDK. |
| * |
| * @author Eric Blake (ebb9@email.byu.edu) |
| */ |
| private static final class AllPermissionCollection extends PermissionCollection |
| { |
| /** |
| * Compatible with JDK 1.1+. |
| */ |
| private static final long serialVersionUID = -4023755556366636806L; |
| |
| /** |
| * Whether an AllPermission has been added to the collection. |
| * |
| * @serial if all permission is in the collection yet |
| */ |
| private boolean all_allowed; |
| |
| /** |
| * Add an AllPermission. |
| * |
| * @param perm the permission to add |
| * @throws IllegalArgumentException if perm is not an AllPermission |
| * @throws SecurityException if the collection is read-only |
| */ |
| public void add(Permission perm) |
| { |
| if (isReadOnly()) |
| throw new SecurityException(); |
| if (! (perm instanceof AllPermission)) |
| throw new IllegalArgumentException(); |
| all_allowed = true; |
| } |
| |
| /** |
| * Returns true if this collection implies a permission. |
| * |
| * @param perm the permission to check |
| * @return true if this collection contains an AllPermission |
| */ |
| public boolean implies(Permission perm) |
| { |
| return all_allowed; |
| } |
| |
| /** |
| * Returns an enumeration of the elements in the collection. |
| * |
| * @return the elements in the collection |
| */ |
| public Enumeration elements() |
| { |
| return all_allowed |
| ? Collections.enumeration(Collections.singleton(new AllPermission())) |
| : EmptyEnumeration.getInstance(); |
| } |
| } // class AllPermissionCollection |
| } // class AllPermission |