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/*******************************************************************************
* Copyright (c) 2003, 2004, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-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;
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);
}
}
/**
* The Permission collection will unresolve the permissions in these packages.
*
* @param refreshedBundles A list of the bundles which have been refreshed
* as a result of a packageRefresh
*/
void unresolvePermissions(AbstractBundle[] refreshedBundles) {
if (assigned != null) {
assigned.unresolvePermissions(refreshedBundles);
}
if (implied != null) {
implied.unresolvePermissions(refreshedBundles);
}
if (conditional != null) {
conditional.unresolvePermissions(refreshedBundles);
}
if (restrictedPermissions != null) {
restrictedPermissions.unresolvePermissions(refreshedBundles);
}
}
/**
* 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() {
return new Enumeration() {
private int i = 0;
private Enumeration[] enums;
{
enums = new Enumeration[] {(assigned == null) ? null : assigned.elements(), (implied == null) ? null : implied.elements()};
}
/**
* Answers if this Enumeration has more elements.
*
* @return true if there are more elements, false otherwise
*
* @see #nextElement
*/
public boolean hasMoreElements() {
while (i < enums.length) {
Enumeration perms = enums[i];
if ((perms != null) && perms.hasMoreElements()) {
return true;
}
i++;
}
return false;
}
/**
* Answers the next element in this Enumeration.
*
* @return the next element in this Enumeration
*
* @exception NoSuchElementException when there are no more elements
*
* @see #hasMoreElements
*/
public Object nextElement() {
while (i < enums.length) {
try {
Enumeration perms = enums[i];
if (perms != null) {
return perms.nextElement();
}
} catch (NoSuchElementException e) {
}
i++;
}
throw new NoSuchElementException();
}
};
}
/**
* 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) && assigned.implies(permission))
return true;
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;
}
}
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