    001    /* ===========================================================
    002     * JFreeChart : a free chart library for the Java(tm) platform
    003     * ===========================================================
    004     *
    005     * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
    006     *
    007     * Project Info:  http://www.jfree.org/jfreechart/index.html
    008     *
    009     * This library is free software; you can redistribute it and/or modify it
    010     * under the terms of the GNU Lesser General Public License as published by
    011     * the Free Software Foundation; either version 2.1 of the License, or
    012     * (at your option) any later version.
    013     *
    014     * This library is distributed in the hope that it will be useful, but
    015     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    016     * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    017     * License for more details.
    018     *
    019     * You should have received a copy of the GNU Lesser General Public
    020     * License along with this library; if not, write to the Free Software
    021     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
    022     * USA.
    023     *
    024     * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
    025     * Other names may be trademarks of their respective owners.]
    026     *
    027     * ---------------
    028     * Annotation.java
    029     * ---------------
    030     * (C) Copyright 2009, 2011 by Object Refinery Limited and Contributors.
    031     *
    032     * Original Author:  Peter Kolb (see patch 2809117);
    033     * Contributor(s):   ;
    034     *
    035     * Changes:
    036     * --------
    037     * 20-Jun-2009 : Version 1 (PK);
    038     *
    039     */
    040
    041    package org.jfree.chart.annotations;
    042
    043    import org.jfree.chart.event.AnnotationChangeEvent;
    044    import org.jfree.chart.event.AnnotationChangeListener;
    045
    046    /**
    047     * The base interface for annotations.  All annotations should support the
    048     * {@link AnnotationChangeEvent} mechanism by allowing listeners to register
    049     * and receive notification of any changes to the annotation.
    050     */
    051    public interface Annotation {
    052
    053        /**
    054         * Registers an object for notification of changes to the annotation.
    055         *
    056         * @param listener  the object to register.
    057         */
    058        public void addChangeListener(AnnotationChangeListener listener);
    059
    060        /**
    061         * Deregisters an object for notification of changes to the annotation.
    062         *
    063         * @param listener  the object to deregister.
    064         */
    065        public void removeChangeListener(AnnotationChangeListener listener);
    066
    067    }