/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 java.security.acl;
import java.security.Principal;
/**
* The interface to manage owners of objects that require ownership.
*
* @see Acl
* @see Principal
*/
public interface Owner {
/**
* Adds a principal to the list of owners.
*
* @param caller
* the invoking principal.
* @param owner
* the owner to added.
* @return {@code true} if the owner was added, {@code false} if it was already an owner.
* @throws NotOwnerException
* if the invoking principal is not an owner.
*/
boolean addOwner(Principal caller, Principal owner)
throws NotOwnerException;
/**
* Removes a principal from the list of owners.
*
* @param caller
* the invoking principal.
* @param owner
* the owner to be removed.
* @return {@code true} if the owner was removed, {@code false} if it was not an owner.
* @throws NotOwnerException
* if the invoking principal is not an owner.
* @throws LastOwnerException
* if the owner to be removed is the last owner and hence removing it
* would make this object owner-less.
*/
boolean deleteOwner(Principal caller, Principal owner)
throws NotOwnerException, LastOwnerException;
/**
* Checks whether the specified principal is an owner of this object.
*
* @param owner
* the principal to check.
* @return {@code true} if the specified principal is an owner, otherwise {@code false}.
*/
boolean isOwner(Principal owner);
}