| /******************************************************************************* |
| * Copyright (c) 2003, 2005 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.osgi.framework.internal.core; |
| |
| import java.security.Permission; |
| import java.util.*; |
| |
| /** |
| * A combination of two BundlePermissionCollection classes. |
| * |
| */ |
| final class BundleCombinedPermissions extends BundlePermissionCollection { |
| private static final long serialVersionUID = 4049357526208360496L; |
| // Note that this forces the Enumeration inner class to be loaded as soon as possible (see bug 119069) |
| private static final Enumeration EMPTY_ENUMERATION = new Enumeration() { |
| public boolean hasMoreElements() { |
| return false; |
| } |
| public Object nextElement() { |
| throw new NoSuchElementException(); |
| } |
| }; |
| private BundlePermissionCollection assigned; |
| private BundlePermissionCollection implied; |
| private ConditionalPermissions conditional; |
| private ConditionalPermissionSet restrictedPermissions; |
| private boolean isDefault; |
| |
| /** |
| * Create a permission combiner class. |
| * |
| * @param implied The permissions a bundle always has. |
| */ |
| BundleCombinedPermissions(BundlePermissionCollection implied) { |
| this.implied = implied; |
| |
| setReadOnly(); /* this doesn't really mean anything */ |
| } |
| |
| /** |
| * Assign the administrator defined permissions. |
| * |
| * @param assigned The permissions assigned by the administrator. |
| * @param isDefault If true, the assigned permissions are the default permissions. |
| */ |
| void setAssignedPermissions(BundlePermissionCollection assigned, boolean isDefault) { |
| this.assigned = assigned; |
| this.isDefault = isDefault; |
| } |
| |
| /** |
| * Assign the conditional permissions |
| * |
| * @param conditional The conditional permissions assigned by the administrator |
| */ |
| void setConditionalPermissions(ConditionalPermissions conditional) { |
| this.conditional = conditional; |
| } |
| |
| void checkConditionalPermissionInfo(ConditionalPermissionInfoImpl cpi) { |
| if (conditional != null) { |
| conditional.checkConditionalPermissionInfo(cpi); |
| } |
| } |
| |
| void unresolvePermissions() { |
| if (assigned != null) |
| assigned.unresolvePermissions(); |
| if (implied != null) |
| implied.unresolvePermissions(); |
| if (conditional != null) |
| conditional.unresolvePermissions(); |
| if (restrictedPermissions != null) |
| restrictedPermissions.unresolvePermissions(); |
| } |
| |
| /** |
| * Adds the argument to the collection. |
| * |
| * @param permission java.security.Permission |
| * the permission to add to the collection. |
| * @exception SecurityException |
| * if the collection is read only. |
| */ |
| public void add(Permission permission) { |
| throw new SecurityException(); |
| } |
| |
| /** |
| * Answers an enumeration of the permissions |
| * in the receiver. |
| * |
| * @return Enumeration |
| * the permissions in the receiver. |
| */ |
| public Enumeration elements() { |
| // TODO return an empty enumeration for now; |
| // It does not seem possible to do this properly with multiple exports and conditional permissions. |
| // When looking to fix this be sure the Enumeration class is loaded as soon as possible (see bug 119069) |
| return EMPTY_ENUMERATION; |
| } |
| |
| /** |
| * Indicates whether the argument permission is implied |
| * by the permissions contained in the receiver. |
| * |
| * @return boolean |
| * <code>true</code> if the argument permission |
| * is implied by the permissions in the receiver, |
| * and <code>false</code> if it is not. |
| * @param permission java.security.Permission |
| * the permission to check |
| */ |
| public boolean implies(Permission permission) { |
| if ((implied != null) && implied.implies(permission)) |
| return true; |
| |
| /* We must be allowed by the restricted permissions to have any hope of |
| * passing the check */ |
| if ((restrictedPermissions != null) && !restrictedPermissions.implies(permission)) { |
| return false; |
| } |
| |
| /* If we aren't using the default permissions, then the assigned |
| * permission are the exact permissions the bundle has. */ |
| if (!isDefault && assigned != null) |
| return assigned.implies(permission); |
| if (conditional != null) { |
| boolean conditionalImplies = conditional.implies(permission); |
| if (!conditional.isEmpty()) { |
| return conditionalImplies; |
| } |
| } |
| /* If there aren't any conditional permissions that apply, we use |
| * the default. */ |
| return assigned.implies(permission); |
| } |
| |
| /** |
| * Sets the restricted Permissions of the Bundle. This set of Permissions limit the |
| * Permissions available to the Bundle. |
| * |
| * @param restrictedPermissions the maximum set of permissions allowed to the Bundle |
| * irrespective of the actual permissions assigned to it. |
| */ |
| public void setRestrictedPermissions(ConditionalPermissionSet restrictedPermissions) { |
| this.restrictedPermissions = restrictedPermissions; |
| } |
| } |