/*
* @(#)file OwnerImpl.java
* @(#)author Sun Microsystems, Inc.
* @(#)version 4.10
* @(#)date 09/10/11
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*/
package com.sun.jmx.snmp.IPAcl;
import java.util.Vector;
import java.io.Serializable;
import java.security.Principal;
import java.security.acl.Owner;
import java.security.acl.LastOwnerException;
import java.security.acl.NotOwnerException;
/**
* Owner of Access Control Lists (ACLs).
* The initial owner Principal should be specified as an
* argument to the constructor of the class AclImpl.
*
* @see java.security.acl.Owner
* @version 4.10 11/17/05
* @author Sun Microsystems, Inc
*/
class OwnerImpl implements Owner, Serializable {
private Vector ownerList = null;
/**
* Constructs an empty list of owner.
*/
public OwnerImpl (){
ownerList = new Vector();
}
/**
* Constructs a list of owner with the specified principal as first element.
*
* @param owner the principal added to the owner list.
*/
public OwnerImpl (PrincipalImpl owner){
ownerList = new Vector();
ownerList.addElement(owner);
}
/**
* Adds an owner. Only owners can modify ACL contents. The caller principal
* must be an owner of the ACL in order to invoke this method. That is, only
* an owner can add another owner. The initial owner is configured at
* ACL construction time.
*
* @param caller the principal invoking this method.
* It must be an owner of the ACL.
* @param owner the owner that should be added to the list of owners.
* @return true if successful, false if owner is already an owner.
* @exception NotOwnerException if the caller principal is not an owner
* of the ACL.
*/
public boolean addOwner(Principal caller, Principal owner)
throws NotOwnerException {
if (!ownerList.contains(caller))
throw new NotOwnerException();
if (ownerList.contains(owner)) {
return false;
} else {
ownerList.addElement(owner);
return true;
}
}
/**
* Deletes an owner. If this is the last owner in the ACL, an exception is raised.
*<P>
* The caller principal must be an owner of the ACL in order to invoke this method.
*
* @param caller the principal invoking this method. It must be an owner
* of the ACL.
* @param owner the owner to be removed from the list of owners.
* @return true if successful, false if owner is already an owner.
* @exception NotOwnerException if the caller principal is not an owner
* of the ACL.
* @exception LastOwnerException if there is only one owner left, so that
* deleteOwner would leave the ACL owner-less.
*/
public boolean deleteOwner(Principal caller, Principal owner)
throws NotOwnerException,LastOwnerException {
if (!ownerList.contains(caller))
throw new NotOwnerException();
if (!ownerList.contains(owner)){
return false;
} else {
if (ownerList.size() == 1)
throw new LastOwnerException();
ownerList.removeElement(owner);
return true;
}
}
/**
* Returns true if the given principal is an owner of the ACL.
*
* @param owner the principal to be checked to determine whether or
* not it is an owner.
* @return true if the given principal is an owner of the ACL.
*/
public boolean isOwner(Principal owner){
return ownerList.contains(owner);
}
}