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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   * 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
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  package java.security.acl;
  
  import java.security.Principal;
  
  /**
   * Interface for managing owners of Access Control Lists (ACLs) or ACL
   * configurations. (Note that the Acl interface in the
   * {@code  java.security.acl} package extends this Owner
   * interface.) The initial owner Principal should be specified as an
   * argument to the constructor of the class implementing this interface.
   *
   * @see Acl
   *
   */
  public interface 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;
  
      /**
       * 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 the owner is removed, false if the owner is not part
       * of the list of owners.
       *
       * @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;
  
      /**
       * 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 passed principal is in the list of owners, false
       * if not.
       */
      public boolean isOwner(Principal owner);
  
  }
  