+++ /dev/null
-/* Permissions.java -- A collection of permission collections
- 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;
-
-import java.io.Serializable;
-import java.util.Hashtable;
-import java.util.Enumeration;
-import java.util.NoSuchElementException;
-
-/**
- * This class is a heterogeneous collection of permissions. It is
- * organized as a collection of <code>PermissionCollection</code>'s stored
- * in a hashtable. Each individual <code>PermissionCollection</code>
- * contains permissions of a single type. If a specific type of
- * <code>Permission</code> does not provide a collection type to use
- * via its <code>newPermissionCollection</code> method, then a default
- * collection type which stores its permissions in a hash table will be
- * used.
- *
- * @version 0.0
- *
- * @author Aaron M. Renn (arenn@urbanophile.com)
- */
-public final class Permissions
- extends PermissionCollection
- implements Serializable
-{
- /**
- * Holds instances of <code>AllPermission</code>.
- */
- private PermissionCollection allPermission;
-
- /**
- * This is the <code>Hashtable</code> that contains our collections.
- */
- Hashtable perms = new Hashtable();
-
- /**
- * This method initializes a new instance of <code>Permissions</code>.
- */
- public Permissions()
- {
- }
-
- /**
- * This method adds a new <code>Permission</code> to this collection. It
- * will be stored in a <code>PermissionCollection</code> of the appropriate
- * type, as determined by calling <code>newPermissionCollection</code> on
- * the specified permission (if an appropriate collection does not already
- * exist). If this object does not specify a particular type of collection,
- * a default collection which stores in permissions in a hash table will
- * be used.
- *
- * @param perm The <code>Permission</code> object to be added to this collection.
- *
- * @exception SecurityException If this collection is marked as read only.
- * @exception IllegalArgumentException If the specified <code>Permission</code> cannot be added to this collection
- */
- public void add(Permission perm)
- throws SecurityException, IllegalArgumentException
- {
- if (isReadOnly())
- throw new SecurityException("PermissionCollection is read only");
-
- if (perm instanceof AllPermission)
- {
- if (allPermission == null)
- {
- allPermission = new
- DefaultPermissionCollection("java.security.AllPermission");
-
- perms.put("java.security.AllPermission", allPermission);
- }
- }
- else
- {
- Object obj = perms.get(perm.getClass().getName());
- if (obj != null)
- {
- if (!(obj instanceof PermissionCollection))
- throw new RuntimeException("Internal error in Permissions");
-
- ((PermissionCollection) obj).add(perm);
- }
- else
- {
- PermissionCollection pc = perm.newPermissionCollection();
- if (pc == null)
- pc = new DefaultPermissionCollection(perm.getClass().getName());
-
- pc.add(perm);
-
- perms.put(perm.getClass().getName(), pc);
- }
- }
- }
-
- /**
- * This method tests whether or not the specified <code>Permission</code>
- * is implied by this <code>PermissionCollection</code>.
- *
- * @param perm The <code>Permission</code> to test.
- *
- * @return <code>true</code> if the specified permission is implied by this <code>PermissionCollection</code>, or <code>false</code> otherwise.
- */
- public boolean implies(Permission perm)
- {
- if (allPermission != null)
- return (true);
-
- Object obj = perms.get(perm.getClass().getName());
- if (obj == null)
- return (false);
-
- if (!(obj instanceof PermissionCollection))
- return (false);
-
- return (((PermissionCollection) obj).implies(perm));
- }
-
- /**
- * This method returns an <code>Enumeration</code> which contains a
- * list of all <code>Permission</code> objects contained in this
- * collection.
- *
- * @return An <code>Enumeration</code> of this collection's elements.
- */
- public Enumeration elements()
- {
- return new Enumeration()
- {
- Enumeration main_enum = perms.elements();
- Enumeration sub_enum;
-
- public boolean hasMoreElements()
- {
- if (sub_enum == null)
- if (main_enum == null)
- return (false);
- else
- {
- if (!main_enum.hasMoreElements())
- return (false);
- else
- {
- try
- {
- PermissionCollection pc =
- (PermissionCollection) main_enum.nextElement();
- sub_enum = pc.elements();
- }
- catch (NoSuchElementException e)
- {
- return (false);
- }
- }
- }
- else if (!sub_enum.hasMoreElements())
- {
- sub_enum = null;
- return (hasMoreElements());
- }
-
- return (true);
- }
-
- public Object nextElement() throws NoSuchElementException
- {
- if (!hasMoreElements())
- throw new NoSuchElementException();
-
- return (sub_enum.nextElement());
- }
- };
- }
-
- static class DefaultPermissionCollection extends PermissionCollection
- implements Serializable
- {
-
- // Type of Permission we can store
- private Class permcls;
-
- // Hashtable where we store permissions.
- private Hashtable perms = new Hashtable();
-
- DefaultPermissionCollection(String permtype) throws IllegalArgumentException
- {
- try
- {
- permcls = Class.forName(permtype);
- }
- catch(ClassNotFoundException e)
- {
- throw new IllegalArgumentException(e.getMessage());
- }
- }
-
- public void add(Permission perm)
- throws SecurityException, IllegalArgumentException
- {
- if (isReadOnly())
- throw new SecurityException("PermissionCollection is read only");
-
- if (!permcls.isInstance(perm))
- throw new IllegalArgumentException("Wrong permission type: " +
- perm.getClass().getName());
-
- if (perms.get(perm.getName()) != null)
- throw new IllegalArgumentException("Duplicate permission: " +
- perm.getName());
-
- perms.put(perm.getName(), perm);
- }
-
- public boolean implies(Permission perm)
- {
- Object obj = perms.get(perm.getName());
- if (obj == null)
- return(false);
-
- if (!(obj instanceof Permission))
- return(false);
-
- Permission p = (Permission)obj;
-
- return(p.implies(perm));
- }
-
- public Enumeration elements()
- {
- return(perms.elements());
- }
- }
-}
projects / msp430-gcc.git / blobdiff