1. /* ===========================================================

  2.  * JFreeChart : a free chart library for the Java(tm) platform

  3.  * ===========================================================

  4.  *

  5.  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.

  6.  *

  7.  * Project Info:  http://www.jfree.org/jfreechart/index.html

  8.  *

  9.  * This library is free software; you can redistribute it and/or modify it 

  10.  * under the terms of the GNU Lesser General Public License as published by 

  11.  * the Free Software Foundation; either version 2.1 of the License, or 

  12.  * (at your option) any later version.

  13.  *

  14.  * This library is distributed in the hope that it will be useful, but 

  15.  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 

  16.  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 

  17.  * License for more details.

  18.  *

  19.  * You should have received a copy of the GNU Lesser General Public License 

  20.  * along with this library; if not, write to the Free Software Foundation, 

  21.  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

  22.  *

  23.  * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 

  24.  * in the United States and other countries.]

  25.  *

  26.  * ----------------------

  27.  * AbstractXYDataset.java

  28.  * ----------------------

  29.  * (C) Copyright 2004, 2005, by Object Refinery Limited.

  30.  *

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

  32.  * Contributor(s):   -;

  33.  *

  34.  * $Id: AbstractXYDataset.java,v 1.2 2005/01/28 14:10:03 mungady Exp $

  35.  *

  36.  * Changes

  37.  * -------

  38.  * 05-May-2004 : Version 1 (DG);

  39.  * 15-Jul-2004 : Switched getX() with getXValue() and getY() with 

  40.  *               getYValue() (DG);

  41.  * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG);

  42.  * 

  43.  */

  44. 

  45. package org.jfree.data.xy;

  46. 

  47. import org.jfree.data.DomainOrder;

  48. import org.jfree.data.general.AbstractSeriesDataset;

  49. 

  50. /**

  51.  * An base class that you can use to create new implementations of the 

  52.  * {@link XYDataset} interface.

  53.  */

  54. public abstract class AbstractXYDataset extends AbstractSeriesDataset 

  55.                                         implements XYDataset {

  56. 

  57.     /**

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

  59.      * 

  60.      * @return The domain order.

  61.      */

  62.     public DomainOrder getDomainOrder() {

  63.         return DomainOrder.NONE;

  64.     }

  65.     

  66.     /**

  67.      * Returns the x-value (as a double primitive) for an item within a series.

  68.      * 

  69.      * @param series  the series index (zero-based).

  70.      * @param item  the item index (zero-based).

  71.      * 

  72.      * @return The value.

  73.      */

  74.     public double getXValue(int series, int item) {

  75.         double result = Double.NaN;

  76.         Number x = getX(series, item);

  77.         if (x != null) {

  78.             result = x.doubleValue();   

  79.         }

  80.         return result;   

  81.     }

  82. 

  83.     /**

  84.      * Returns the y-value (as a double primitive) for an item within a series.

  85.      * 

  86.      * @param series  the series index (zero-based).

  87.      * @param item  the item index (zero-based).

  88.      * 

  89.      * @return The value.

  90.      */

  91.     public double getYValue(int series, int item) {

  92.         double result = Double.NaN;

  93.         Number y = getY(series, item);

  94.         if (y != null) {

  95.             result = y.doubleValue();   

  96.         }

  97.         return result;   

  98.     }

  99. 

  100. }