001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2013, 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 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
025 * Other names may be trademarks of their respective owners.]
026 *
027 * ------------------------------
028 * AbstractIntervalXYDataset.java
029 * ------------------------------
030 * (C) Copyright 2004-2008, by Object Refinery Limited.
031 *
032 * Original Author:  David Gilbert (for Object Refinery Limited).
033 * Contributor(s):   -;
034 *
035 * Changes
036 * -------
037 * 05-May-2004 : Version 1 (DG);
038 * 15-Jul-2004 : Switched getStartX() and getStartXValue() methods and
039 *               others (DG);
040 * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG);
041 *
042 */
043
044package org.jfree.data.xy;
045
046
047/**
048 * An base class that you can use to create new implementations of the
049 * {@link IntervalXYDataset} interface.
050 */
051public abstract class AbstractIntervalXYDataset extends AbstractXYDataset
052        implements IntervalXYDataset {
053
054    /**
055     * Returns the start x-value (as a double primitive) for an item within a
056     * series.
057     *
058     * @param series  the series index (zero-based).
059     * @param item  the item index (zero-based).
060     *
061     * @return The value.
062     */
063    @Override
064    public double getStartXValue(int series, int item) {
065        double result = Double.NaN;
066        Number x = getStartX(series, item);
067        if (x != null) {
068            result = x.doubleValue();
069        }
070        return result;
071    }
072
073    /**
074     * Returns the end x-value (as a double primitive) for an item within a
075     * series.
076     *
077     * @param series  the series index (zero-based).
078     * @param item  the item index (zero-based).
079     *
080     * @return The value.
081     */
082    @Override
083    public double getEndXValue(int series, int item) {
084        double result = Double.NaN;
085        Number x = getEndX(series, item);
086        if (x != null) {
087            result = x.doubleValue();
088        }
089        return result;
090    }
091
092    /**
093     * Returns the start y-value (as a double primitive) for an item within a
094     * series.
095     *
096     * @param series  the series index (zero-based).
097     * @param item  the item index (zero-based).
098     *
099     * @return The value.
100     */
101    @Override
102    public double getStartYValue(int series, int item) {
103        double result = Double.NaN;
104        Number y = getStartY(series, item);
105        if (y != null) {
106            result = y.doubleValue();
107        }
108        return result;
109    }
110
111    /**
112     * Returns the end y-value (as a double primitive) for an item within a
113     * series.
114     *
115     * @param series  the series (zero-based index).
116     * @param item  the item (zero-based index).
117     *
118     * @return The value.
119     */
120    @Override
121    public double getEndYValue(int series, int item) {
122        double result = Double.NaN;
123        Number y = getEndY(series, item);
124        if (y != null) {
125            result = y.doubleValue();
126        }
127        return result;
128    }
129
130}