/* ===========================================================

 * 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.]

 *

 * ----------------------

 * AbstractXYDataset.java

 * ----------------------

 * (C) Copyright 2004, by Object Refinery Limited.

 *

 * Original Author:  David Gilbert (for Object Refinery Limited).

 * Contributor(s):   -;

 *

 * $Id: AbstractXYDataset.java,v 1.1 2004/08/31 15:36:12 mungady Exp $

 *

 * Changes

 * -------

 * 05-May-2004 : Version 1 (DG);

 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with getYValue() (DG);

 * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG);

 * 

 */



package org.jfree.data.xy;



import org.jfree.data.DomainOrder;

import org.jfree.data.general.AbstractSeriesDataset;



/**

 * An base class that you can use to create new implementations of the {@link XYDataset}

 * interface.

 */

public abstract class AbstractXYDataset extends AbstractSeriesDataset implements XYDataset {



    /**

     * Returns the order of the domain (X) values.

     * 

     * @return The domain order.

     */

    public DomainOrder getDomainOrder() {

        return DomainOrder.NONE;

    }

    

    /**

     * Returns the 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 value.

     */

    public double getXValue(int series, int item) {

        double result = Double.NaN;

        Number x = getX(series, item);

        if (x != null) {

            result = x.doubleValue();   

        }

        return result;   

    }



    /**

     * Returns the 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 value.

     */

    public double getYValue(int series, int item) {

        double result = Double.NaN;

        Number y = getY(series, item);

        if (y != null) {

            result = y.doubleValue();   

        }

        return result;   

    }



}

