1 /* ===========================================================
2 * JFreeChart : a free chart library for the Java(tm) platform
3 * ===========================================================
4 *
5 * (C) Copyright 2000-2007, 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
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22 * USA.
23 *
24 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25 * in the United States and other countries.]
26 *
27 * ---------------
28 * XYZDataset.java
29 * ---------------
30 * (C) Copyright 2001-2007, by Object Refinery Limited.
31 *
32 * Original Author: David Gilbert (for Object Refinery Limited);
33 * Contributor(s): -;
34 *
35 * Changes
36 * -------
37 * 31-Oct-2001 : Initial version (DG);
38 * 05-May-2004 : Added getZ() method;
39 * 15-Jul-2004 : Switched getZ() and getZValue() methods (DG);
40 * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG);
41 *
42 */
43 package org.jfree.data.xy;
44
45
46 /**
47 * The interface through which JFreeChart obtains data in the form of (x, y, z)
48 * items - used for XY and XYZ plots.
49 */
50 public interface XYZDataset extends XYDataset {
51
52 /**
53 * Returns the z-value for the specified series and item.
54 *
55 * @param series the series index (zero-based).
56 * @param item the item index (zero-based).
57 *
58 * @return The z-value (possibly <code>null</code>).
59 */
60 public Number getZ(int series, int item);
61
62 /**
63 * Returns the z-value (as a double primitive) for an item within a series.
64 *
65 * @param series the series (zero-based index).
66 * @param item the item (zero-based index).
67 *
68 * @return The z-value.
69 */
70 public double getZValue(int series, int item);
71
72 }
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