001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, 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 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025 * in the United States and other countries.]
026 *
027 * -----------------------
028 * XYToolTipGenerator.java
029 * -----------------------
030 * (C) Copyright 2001-2008, by Object Refinery Limited.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited);
033 * Contributor(s): -;
034 *
035 * Changes
036 * -------
037 * 15-Apr-2004 : Extracted the generateToolTip() method from the
038 * XYItemLabelGenerator interface and put it into this new
039 * interface (DG);
040 *
041 */
042
043 package org.jfree.chart.labels;
044
045 import org.jfree.data.xy.XYDataset;
046
047 /**
048 * Interface for a tooltip generator for plots that use data from an
049 * {@link XYDataset}.
050 */
051 public interface XYToolTipGenerator {
052
053 /**
054 * Generates the tooltip text for the specified item.
055 *
056 * @param dataset the dataset (<code>null</code> not permitted).
057 * @param series the series index (zero-based).
058 * @param item the item index (zero-based).
059 *
060 * @return The tooltip text (possibly <code>null</code>).
061 */
062 public String generateToolTip(XYDataset dataset, int series, int item);
063
064 }