code: @Override
      public IPermission[] getPermissionsForOwner(String owner, String activity, String target)
              throws AuthorizationException {
          return primRetrievePermissions(owner, null, activity, target);
      }
docs: Returns the <code>IPermissions</code> owner has granted for the specified activity and
  target. Null parameters will be ignored, that is, all <code>IPermissions</code> matching the
  non-null parameters are retrieved.
  
  @return org.apereo.portal.security.IPermission[]
  @param owner java.lang.String
  @param activity java.lang.String
  @param target java.lang.String
  @exception AuthorizationException indicates authorization information could not be retrieved.