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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.]
 *
 * -------------------
 * TableXYDataset.java
 * -------------------
 * (C) Copyright 2000-2008, by Richard Atkinson and Contributors.
 *
 * Original Author:  Richard Atkinson;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 22-Sep-2003 : Changed to be an interface.  Previous functionality moved to
 *               DefaultTableXYDataset;
 * 16-Feb-2004 : Updated Javadocs (DG);
 *
 */

package org.jfree.data.xy;


/**
 * A dataset containing one or more data series containing (x, y) data items,
 * where all series in the dataset share the same set of x-values.  This is a
 * restricted form of the {@link XYDataset} interface (which allows independent
 * x-values between series). This is used primarily by the
 * {@link org.jfree.chart.renderer.xy.StackedXYAreaRenderer}.
 */
public interface TableXYDataset extends XYDataset {

    /**
     * Returns the number of items every series.
     *
     * @return The item count.
     */
    public int getItemCount();

}