001/* =========================================================== 002 * Orson Charts : a 3D chart library for the Java(tm) platform 003 * =========================================================== 004 * 005 * (C)opyright 2013-2022, by David Gilbert. All rights reserved. 006 * 007 * https://github.com/jfree/orson-charts 008 * 009 * This program is free software: you can redistribute it and/or modify 010 * it under the terms of the GNU General Public License as published by 011 * the Free Software Foundation, either version 3 of the License, or 012 * (at your option) any later version. 013 * 014 * This program is distributed in the hope that it will be useful, 015 * but WITHOUT ANY WARRANTY; without even the implied warranty of 016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 017 * GNU General Public License for more details. 018 * 019 * You should have received a copy of the GNU General Public License 020 * along with this program. If not, see <http://www.gnu.org/licenses/>. 021 * 022 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 023 * Other names may be trademarks of their respective owners.] 024 * 025 * If you do not wish to be bound by the terms of the GPL, an alternative 026 * commercial license can be purchased. For details, please see visit the 027 * Orson Charts home page: 028 * 029 * http://www.object-refinery.com/orsoncharts/index.html 030 * 031 */ 032 033package org.jfree.chart3d.data; 034 035import java.util.EventListener; 036 037/** 038 * The base interface for datasets in Orson Charts. All datasets must support 039 * the change event notification mechanism. The idea is that when a dataset 040 * is changed, an event is passed to the plot. The plot can react to this 041 * event, then pass on the change event to the chart. The chart in turn will 042 * pass on the event and this can result in the chart being repainted (for 043 * example, if the chart is displayed in a 044 * {@link org.jfree.chart3d.Chart3DPanel}). 045 */ 046public interface Dataset3D { 047 048 /** 049 * Registers a change listener to receive notification of changes to the 050 * dataset. 051 * 052 * @param listener the listener ({@code null} not permitted). 053 */ 054 void addChangeListener(Dataset3DChangeListener listener); 055 056 /** 057 * De-registers a change listener so that it no longer receives notification 058 * of changes to the dataset. 059 * 060 * @param listener the listener ({@code null} not permitted). 061 */ 062 void removeChangeListener(Dataset3DChangeListener listener); 063 064 /** 065 * Returns {@code true} if the specified listener is registered with 066 * the dataset, and {@code false} otherwise. This method is used 067 * for unit testing to confirm that listeners are removed correctly 068 * following dataset switches. 069 * 070 * @param listener the listener. 071 * 072 * @return A boolean. 073 */ 074 boolean hasListener(EventListener listener); 075}