01: /* ===========================================================
02: * JFreeChart : a free chart library for the Java(tm) platform
03: * ===========================================================
04: *
05: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
06: *
07: * Project Info: http://www.jfree.org/jfreechart/index.html
08: *
09: * 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 2001-2004, by Object Refinery Limited.
31: *
32: * Original Author: David Gilbert (for Object Refinery Limited);
33: * Contributor(s): -;
34: *
35: * $Id: XYZDataset.java,v 1.2.2.1 2005/10/25 21:36:51 mungady Exp $
36: *
37: * Changes
38: * -------
39: * 31-Oct-2001 : Initial version (DG);
40: * 05-May-2004 : Added getZ() method;
41: * 15-Jul-2004 : Switched getZ() and getZValue() methods (DG);
42: * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG);
43: *
44: */
45: package org.jfree.data.xy;
46:
47: /**
48: * The interface through which JFreeChart obtains data in the form of (x, y, z)
49: * items - used for XY and XYZ plots.
50: */
51: public interface XYZDataset extends XYDataset {
52:
53: /**
54: * Returns the z-value for the specified series and item.
55: *
56: * @param series the series index (zero-based).
57: * @param item the item index (zero-based).
58: *
59: * @return The z-value (possibly <code>null</code>).
60: */
61: public Number getZ(int series, int item);
62:
63: /**
64: * Returns the z-value (as a double primitive) for an item within a series.
65: *
66: * @param series the series (zero-based index).
67: * @param item the item (zero-based index).
68: *
69: * @return The z-value.
70: */
71: public double getZValue(int series, int item);
72:
73: }
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