/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2004, 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., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * ----------------------
 * IntervalXYDataset.java
 * ----------------------
 * (C) Copyright 2001-2004, by Object Refinery Limited and Contributors.
 *
 * Original Author:  Mark Watson (www.markwatson.com);
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: IntervalXYDataset.java,v 1.1 2004/08/31 15:36:12 mungady Exp $
 *
 * Changes
 * -------
 * 18-Oct-2001 : Version 1, thanks to Mark Watson (DG);
 * 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc (DG);
 * 06-May-2004 : Added methods that return double primitives (DG);
 *
 */

package org.jfree.data.xy;


/**
 * An extension of the {@link XYDataset} interface that allows a range of data to be
 * defined for the X values, the Y values, or both the X and Y values.  This interface is 
 * used to support (among other things) bar plots against numerical axes.
 */
public interface IntervalXYDataset extends XYDataset {

    /**
     * Returns the starting X value for the specified series and item.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    public Number getStartX(int series, int item);

    /**
     * Returns the start x-value (as a double primitive) for an item within a series.
     * 
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     * 
     * @return The start x-value.
     */
    public double getStartXValue(int series, int item);

    /**
     * Returns the ending X value for the specified series and item.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    public Number getEndX(int series, int item);

    /**
     * Returns the end x-value (as a double primitive) for an item within a series.
     * 
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     * 
     * @return The end x-value.
     */
    public double getEndXValue(int series, int item);

    /**
     * Returns the starting Y value for the specified series and item.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    public Number getStartY(int series, int item);

    /**
     * Returns the start y-value (as a double primitive) for an item within a series.
     * 
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     * 
     * @return The start y-value.
     */
    public double getStartYValue(int series, int item);

    /**
     * Returns the ending Y value for the specified series and item.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    public Number getEndY(int series, int item);

    /**
     * Returns the end y-value (as a double primitive) for an item within a series.
     * 
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     * 
     * @return The end y-value.
     */
    public double getEndYValue(int series, int item);

}