if ( byOid.containsKey( attributeType.getOid() ) )
if ( byName.containsKey( name ) )
    public void register( MatchingRuleUse attributeType ) throws NamingException    {        if ( byOid.containsKey( attributeType.getOid() ) )        {            NamingException e = new NamingException( "attributeType w/ OID " +                attributeType.getOid() + " has already been registered!" );            monitor.registerFailed( attributeType, e );            throw e;        }        byOid.put( attributeType.getOid(), attributeType );        monitor.registered( attributeType );    }