content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2008, 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.]
   *
   * -----------------------
   * XYToolTipGenerator.java
   * -----------------------
   * (C) Copyright 2001-2008, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 15-Apr-2004 : Extracted the generateToolTip() method from the
   *               XYItemLabelGenerator interface and put it into this new
   *               interface (DG);
   *
   */
  
  package org.jfree.chart.labels;
  
  import org.jfree.data.xy.XYDataset;
  
  /**
   * Interface for a tooltip generator for plots that use data from an
   * {@link XYDataset}.
   */
  public interface XYToolTipGenerator {
  
      /**
       * Generates the tooltip text for the specified item.
       *
       * @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(XYDataset dataset, int series, int item);
  
  }
  