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

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

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

  4.  *

  5.  * (C) Copyright 2000-2004, 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 under the terms

  10.  * of the GNU Lesser General Public License as published by the Free Software Foundation;

  11.  * either version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;

  14.  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

  15.  * See the GNU Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public License along with this

  18.  * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,

  19.  * Boston, MA 02111-1307, USA.

  20.  *

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

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

  23.  *

  24.  * -----------------------

  25.  * AbstractXYZDataset.java

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

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

  28.  *

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

  30.  * Contributor(s):   -;

  31.  *

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

  33.  *

  34.  * Changes

  35.  * -------

  36.  * 05-May-2004 : Version 1 (DG);

  37.  * 15-Jul-2004 : Switched getZ() and getZValue() (DG);

  38.  *

  39.  */

  40. 

  41. package org.jfree.data.xy;

  42. 

  43. 

  44. /**

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

  46.  * interface.

  47.  */

  48. public abstract class AbstractXYZDataset extends AbstractXYDataset implements XYZDataset {

  49. 

  50.     /**

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

  52.      * 

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

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

  55.      * 

  56.      * @return The z-value.

  57.      */

  58.     public double getZValue(int series, int item) {

  59.         double result = Double.NaN;

  60.         Number z = getZ(series, item);

  61.         if (z != null) {

  62.             result = z.doubleValue();   

  63.         }

  64.         return result;   

  65.     }

  66. 

  67. }