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.label; 034 035import org.jfree.chart3d.data.PieDataset3D; 036 037/** 038 * A label generator for pie charts. A default implementation 039 * ({@link StandardPieLabelGenerator}) is provided. 040 */ 041public interface PieLabelGenerator { 042 043 /** 044 * Returns a label for one data item in a pie chart. 045 * 046 * @param dataset the dataset ({@code null} not permitted). 047 * @param key the key ({@code null} not permitted). 048 * 049 * @return The label (possibly {@code null}). 050 */ 051 String generateLabel(PieDataset3D dataset, Comparable<?> key); 052 053}