/*
* Copyright 2001-2004 Fraunhofer Gesellschaft, Munich, Germany, for its
* Fraunhofer Institute Computer Architecture and Software Technology
* (FIRST), Berlin, Germany
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package gabriel.acl;
import gabriel.Permission;
import gabriel.Principal;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* AclEntry which maps a principal to permissions. Entries can
* be negative which will cancel the permission for a principal.
*
* @author Stephan J. Schmidt
* @version $Id: AclEntry.java,v 1.2 2004/06/24 07:26:21 stephan Exp $
*/
public class AclEntry {
private List permissions;
private Principal principal;
private boolean negative;
/**
* Creates a new AclEntry from a principal.
*
* @param principal Principal which this AclEntry is about
*/
public AclEntry(Principal principal) {
this.principal = principal;
this.permissions = new ArrayList();
negative = false;
}
/**
* Set principal of the entry.
*
* @param principal New principal
*/
public void setPrincipal(Principal principal) {
this.principal = principal;
}
/**
* Get principal from entry.
*
* @return Principal which is assigned to permission
*/
public Principal getPrincipal() {
return principal;
}
/**
* Permissions in this entry are negative.
*/
public void setNegativePermissions() {
negative = true;
}
/**
* Check if the permissions in this entry are negative.
*
* @return true if the permissions are negative
*/
public boolean isNegative() {
return negative;
}
/**
* Add a permission to the entry.
* Shouldn't this also check for an owner?
*
* @param permission Permission to add
* @return true if permission was added
*/
public boolean addPermission(Permission permission) {
if (!permissions.contains(permission)) {
return permissions.add(permission);
}
return true;
}
/**
* Remove permission from the entry.
*
* @param permission Permission to remove
* @return true if permission was removed
*/
public boolean removePermission(Permission permission) {
return permissions.remove(permission);
}
/**
* Check if the AclEntry has the permission.
*
* @param checkPermission Permission to check
* @return true if AclEntry has the permission
*/
public boolean checkPermission(Permission checkPermission) {
boolean hasPermission = false;
Iterator iterator = permissions.iterator();
while (iterator.hasNext()) {
Permission permission = (Permission) iterator.next();
if (permission.implies(checkPermission)) {
hasPermission = true;
}
}
return hasPermission;
}
/**
* Return all permission for this entry.
*
* @return List with permissions assigned to this entry
*/
public List permissions() {
return permissions;
}
}