167 lines
5.4 KiB
Java
167 lines
5.4 KiB
Java
/* PropertyPermissionCollection.java -- a collection of PropertyPermissions
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Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.util;
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import java.security.Permission;
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import java.security.PermissionCollection;
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/**
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* This class provides the implementation for
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* <code>PropertyPermission.newPermissionCollection()</code>. It only accepts
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* PropertyPermissions, and correctly implements <code>implies</code>. It
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* is synchronized, as specified in the superclass.
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*
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* @author Eric Blake (ebb9@email.byu.edu)
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* @status an undocumented class, but this matches Sun's serialization
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*/
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class PropertyPermissionCollection extends PermissionCollection
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{
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/**
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* Compatible with JDK 1.4.
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*/
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private static final long serialVersionUID = 7015263904581634791L;
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/**
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* The permissions.
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*
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* @serial the table of permissions in the collection
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*/
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private final Hashtable permissions = new Hashtable();
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/**
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* A flag to detect if "*" is in the collection.
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*
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* @serial true if "*" is in the collection
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*/
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private boolean all_allowed;
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/**
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* Adds a PropertyPermission to this collection.
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*
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* @param permission the permission to add
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* @throws IllegalArgumentException if permission is not a PropertyPermission
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* @throws SecurityException if collection is read-only
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*/
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public void add(Permission permission)
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{
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if (isReadOnly())
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throw new SecurityException("readonly");
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if (! (permission instanceof PropertyPermission))
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throw new IllegalArgumentException();
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PropertyPermission pp = (PropertyPermission) permission;
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String name = pp.getName();
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if (name.equals("*"))
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all_allowed = true;
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PropertyPermission old = (PropertyPermission) permissions.get(name);
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if (old != null)
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{
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if ((pp.actions | old.actions) == old.actions)
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pp = old; // Old implies pp.
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else if ((pp.actions | old.actions) != pp.actions)
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// Here pp doesn't imply old; the only case left is both actions.
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pp = new PropertyPermission(name, "read,write");
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}
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permissions.put(name, pp);
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}
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/**
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* Returns true if this collection implies the given permission. This even
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* returns true for this case:
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*
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* <pre>
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* collection.add(new PropertyPermission("a.*", "read"));
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* collection.add(new PropertyPermission("a.b.*", "write"));
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* collection.implies(new PropertyPermission("a.b.c", "read,write"));
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* </pre>
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*
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* @param permission the permission to check
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* @return true if it is implied by this
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*/
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public boolean implies(Permission permission)
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{
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if (! (permission instanceof PropertyPermission))
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return false;
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PropertyPermission toImply = (PropertyPermission) permission;
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int actions = toImply.actions;
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if (all_allowed)
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{
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int all_actions = ((PropertyPermission) permissions.get("*")).actions;
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actions &= ~all_actions;
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if (actions == 0)
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return true;
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}
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String name = toImply.getName();
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if (name.equals("*"))
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return false;
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int prefixLength = name.length();
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if (name.endsWith("*"))
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prefixLength -= 2;
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while (true)
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{
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PropertyPermission forName =
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(PropertyPermission) permissions.get(name);
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if (forName != null)
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{
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actions &= ~forName.actions;
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if (actions == 0)
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return true;
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}
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prefixLength = name.lastIndexOf('.', prefixLength - 1);
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if (prefixLength < 0)
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return false;
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name = name.substring(0, prefixLength + 1) + '*';
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}
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}
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/**
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* Enumerate over the collection.
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*
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* @return an enumeration of the collection contents
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*/
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public Enumeration elements()
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{
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return permissions.elements();
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}
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}
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