/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * ------------------------
 * XYZToolTipGenerator.java
 * ------------------------
 * (C) Copyright 2003-2007, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 03-Feb-2003 : Version 1 (DG);
 * 25-Feb-2004 : Renamed XYZToolTipGenerator --> XYZItemLabelGenerator (DG);
 * 11-May-2004 : Reverted to XYZToolTipGenerator (DG);
 *
 */

package org.jfree.chart.labels;

import org.jfree.data.xy.XYZDataset;

/**
 * Interface for a tooltip generator for plots that use data from an 
 * {@link XYZDataset}.
 */
public interface XYZToolTipGenerator extends XYToolTipGenerator {

    /**
     * Generates a tool tip text item for a particular item within a series.
     *
     * @param dataset  the dataset (<code>null</code> not permitted).
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The tooltip text (possibly <code>null</code>).
     */
    public String generateToolTip(XYZDataset dataset, int series, int item);

}
