001/*
002 * This library is part of OpenCms -
003 * the Open Source Content Management System
004 *
005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * For further information about Alkacon Software, please see the
018 * company website: http://www.alkacon.com
019 *
020 * For further information about OpenCms, please see the
021 * project website: http://www.opencms.org
022 *
023 * You should have received a copy of the GNU Lesser General Public
024 * License along with this library; if not, write to the Free Software
025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
026 */
027
028package org.opencms.acacia.client.widgets.serialdate;
029
030import org.opencms.acacia.shared.I_CmsSerialDateValue;
031
032/** Extension of {@link I_CmsSerialDateValue} that makes value changes observable. */
033public interface I_CmsObservableSerialDateValue extends I_CmsSerialDateValue {
034
035    /**
036     * Register an observer.
037     * @param obs the observer to register.
038     */
039    void registerValueChangeObserver(I_CmsSerialDateValueChangeObserver obs);
040
041    /**
042     * Unregister an observer.
043     * @param obs the observer to unregister.
044     */
045    void unregisterValueChangeObserver(I_CmsSerialDateValueChangeObserver obs);
046}