001: /* ===========================================================
002: * JFreeChart : a free chart library for the Java(tm) platform
003: * ===========================================================
004: *
005: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006: *
007: * Project Info: http://www.jfree.org/jfreechart/index.html
008: *
009: * This library is free software; you can redistribute it and/or modify it
010: * under the terms of the GNU Lesser General Public License as published by
011: * the Free Software Foundation; either version 2.1 of the License, or
012: * (at your option) any later version.
013: *
014: * This library is distributed in the hope that it will be useful, but
015: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017: * License for more details.
018: *
019: * You should have received a copy of the GNU Lesser General Public
020: * License along with this library; if not, write to the Free Software
021: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022: * USA.
023: *
024: * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025: * in the United States and other countries.]
026: *
027: * ----------------------
028: * AbstractXYDataset.java
029: * ----------------------
030: * (C) Copyright 2004, 2005, by Object Refinery Limited.
031: *
032: * Original Author: David Gilbert (for Object Refinery Limited).
033: * Contributor(s): -;
034: *
035: * $Id: AbstractXYDataset.java,v 1.2.2.1 2005/10/25 21:36:51 mungady Exp $
036: *
037: * Changes
038: * -------
039: * 05-May-2004 : Version 1 (DG);
040: * 15-Jul-2004 : Switched getX() with getXValue() and getY() with
041: * getYValue() (DG);
042: * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG);
043: *
044: */
045:
046: package org.jfree.data.xy;
047:
048: import org.jfree.data.DomainOrder;
049: import org.jfree.data.general.AbstractSeriesDataset;
050:
051: /**
052: * An base class that you can use to create new implementations of the
053: * {@link XYDataset} interface.
054: */
055: public abstract class AbstractXYDataset extends AbstractSeriesDataset
056: implements XYDataset {
057:
058: /**
059: * Returns the order of the domain (X) values.
060: *
061: * @return The domain order.
062: */
063: public DomainOrder getDomainOrder() {
064: return DomainOrder.NONE;
065: }
066:
067: /**
068: * Returns the x-value (as a double primitive) for an item within a series.
069: *
070: * @param series the series index (zero-based).
071: * @param item the item index (zero-based).
072: *
073: * @return The value.
074: */
075: public double getXValue(int series, int item) {
076: double result = Double.NaN;
077: Number x = getX(series, item);
078: if (x != null) {
079: result = x.doubleValue();
080: }
081: return result;
082: }
083:
084: /**
085: * Returns the y-value (as a double primitive) for an item within a series.
086: *
087: * @param series the series index (zero-based).
088: * @param item the item index (zero-based).
089: *
090: * @return The value.
091: */
092: public double getYValue(int series, int item) {
093: double result = Double.NaN;
094: Number y = getY(series, item);
095: if (y != null) {
096: result = y.doubleValue();
097: }
098: return result;
099: }
100:
101: }
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