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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 2000-2020, 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.]
 *
 * ------------------
 * SeriesDataset.java
 * ------------------
 * (C) Copyright 2000-2020, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 */

package org.jfree.data.general;

import org.jfree.data.category.CategoryDataset;
import org.jfree.data.xy.IntervalXYDataset;
import org.jfree.data.xy.IntervalXYZDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYZDataset;

/**
 * The interface for a dataset consisting of one or many series of data.
 *
 * @see CategoryDataset
 * @see IntervalXYDataset
 * @see IntervalXYZDataset
 * @see XYDataset
 * @see XYZDataset
 */
public interface SeriesDataset extends Dataset {

    /**
     * Returns the number of series in the dataset.
     *
     * @return The series count.
     */
    public int getSeriesCount();

    /**
     * Returns the key for a series.
     *
     * @param series  the series index (in the range {@code 0} to
     *     {@code getSeriesCount() - 1}).
     *
     * @return The key for the series.
     */
    public Comparable getSeriesKey(int series);

    /**
     * Returns the index of the series with the specified key, or -1 if there
     * is no such series in the dataset.
     *
     * @param seriesKey  the series key ({@code null} permitted).
     *
     * @return The index, or -1.
     */
    public int indexOf(Comparable seriesKey);

}