001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-present, by David Gilbert 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 * PieToolTipGenerator.java
029 * ------------------------
030 * (C) Copyright 2001-present, by David Gilbert.
031 *
032 * Original Author:  David Gilbert;
033 * Contributor(s):   -;
034 *
035 */
036
037package org.jfree.chart.labels;
038
039import org.jfree.data.general.PieDataset;
040
041/**
042 * A tool tip generator that is used by the
043 * {@link org.jfree.chart.plot.PiePlot} class.
044 */
045public interface PieToolTipGenerator {
046
047    /**
048     * Generates a tool tip text item for the specified item in the dataset.
049     * This method can return {@code null} to indicate that no tool tip
050     * should be displayed for an item.
051     *
052     * @param dataset  the dataset ({@code null} not permitted).
053     * @param key  the section key ({@code null} not permitted).
054     *
055     * @return The tool tip text (possibly {@code null}).
056     */
057    String generateToolTip(PieDataset dataset, Comparable key);
058
059}