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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
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package sun.security.acl;
import java.util.*;
import java.security.*;
import java.security.acl.*;
/**
* Class implementing the Owner interface. The
* initial owner principal is configured as
* part of the constructor.
* @author Satish Dharmaraj
*/
public class OwnerImpl implements Owner {
private Group ownerGroup;
public OwnerImpl(Principal owner) {
ownerGroup = new GroupImpl("AclOwners");
ownerGroup.addMember(owner);
}
/**
* Adds an owner. Owners can modify ACL contents and can disassociate
* ACLs from the objects they protect in the AclConfig interface.
* The caller principal must be a part of the owners list of the ACL in
* order to invoke this method. The initial owner is configured
* at ACL construction time.
* @param caller the principal who is invoking this method.
* @param owner The owner that should be added to the owners list.
* @return true if success, false if already an owner.
* @exception NotOwnerException if the caller principal is not on
* the owners list of the Acl.
*/
public synchronized boolean addOwner(Principal caller, Principal owner)
throws NotOwnerException
{
if (!isOwner(caller))
throw new NotOwnerException();
ownerGroup.addMember(owner);
return false;
}
/**
* Delete owner. If this is the last owner in the ACL, an exception is
* raised.
* The caller principal must be a part of the owners list of the ACL in
* order to invoke this method.
* @param caller the principal who is invoking this method.
* @param owner The owner to be removed from the owners list.
* @return true if the owner is removed, false if the owner is not part
* of the owners list.
* @exception NotOwnerException if the caller principal is not on
* the owners list of the Acl.
* @exception LastOwnerException if there is only one owner left in the group, then
* deleteOwner would leave the ACL owner-less. This exception is raised in such a case.
*/
public synchronized boolean deleteOwner(Principal caller, Principal owner)
throws NotOwnerException, LastOwnerException
{
if (!isOwner(caller))
throw new NotOwnerException();
Enumeration<? extends Principal> e = ownerGroup.members();
//
// check if there is atleast 2 members left.
//
Object o = e.nextElement();
if (e.hasMoreElements())
return ownerGroup.removeMember(owner);
else
throw new LastOwnerException();
}
/**
* returns if the given principal belongs to the owner list.
* @param owner The owner to check if part of the owners list
* @return true if the passed principal is in the owner list, false if not.
*/
public synchronized boolean isOwner(Principal owner) {
return ownerGroup.isMember(owner);
}
}