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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D APIs, it currently supports bar charts, pie charts, line charts, XY-plots and time series plots.

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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2013, 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.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 * ---------------------------
 * XYSeriesLabelGenerator.java
 * ---------------------------
 * (C) Copyright 2004-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 16-Nov-2004 : Version 1 (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 24-Nov-2006 : Updated API docs (DG);
 *
 */

package org.jfree.chart.labels;

import org.jfree.data.xy.XYDataset;

/**
 * A generator that creates labels for the series in an {@link XYDataset}.
 * 
 * Classes that implement this interface should be either (a) immutable, or
 * (b) cloneable via the PublicCloneable interface (defined in
 * the JCommon class library).  This provides a mechanism for the referring
 * renderer to clone the generator if necessary.
 */
public interface XYSeriesLabelGenerator {

    /**
     * Generates a label for the specified series.  This label will be
     * used for the chart legend.
     *
     * @param dataset  the dataset (null not permitted).
     * @param series  the series.
     *
     * @return A series label.
     */
    public String generateLabel(XYDataset dataset, int series);

}