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 041package org.jfree.chart.annotations; 042 043import org.jfree.chart.event.AnnotationChangeEvent; 044import 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 */ 051public 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}