001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2022, by David Gilbert 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 2004-2022, by David Gilbert.
031 *
032 * Original Author:  David Gilbert.
033 * Contributor(s):   -;
034 *
035 */
036
037package org.jfree.data.xy;
038
039
040/**
041 * An base class that you can use to create new implementations of the
042 * {@link IntervalXYDataset} interface.
043 */
044public abstract class AbstractIntervalXYDataset<S extends Comparable<S>> 
045        extends AbstractXYDataset<S>
046        implements IntervalXYDataset<S> {
047
048    /**
049     * Returns the start x-value (as a double primitive) for an item within a
050     * series.
051     *
052     * @param series  the series index (zero-based).
053     * @param item  the item index (zero-based).
054     *
055     * @return The value.
056     */
057    @Override
058    public double getStartXValue(int series, int item) {
059        double result = Double.NaN;
060        Number x = getStartX(series, item);
061        if (x != null) {
062            result = x.doubleValue();
063        }
064        return result;
065    }
066
067    /**
068     * Returns the end x-value (as a double primitive) for an item within a
069     * series.
070     *
071     * @param series  the series index (zero-based).
072     * @param item  the item index (zero-based).
073     *
074     * @return The value.
075     */
076    @Override
077    public double getEndXValue(int series, int item) {
078        double result = Double.NaN;
079        Number x = getEndX(series, item);
080        if (x != null) {
081            result = x.doubleValue();
082        }
083        return result;
084    }
085
086    /**
087     * Returns the start y-value (as a double primitive) for an item within a
088     * series.
089     *
090     * @param series  the series index (zero-based).
091     * @param item  the item index (zero-based).
092     *
093     * @return The value.
094     */
095    @Override
096    public double getStartYValue(int series, int item) {
097        double result = Double.NaN;
098        Number y = getStartY(series, item);
099        if (y != null) {
100            result = y.doubleValue();
101        }
102        return result;
103    }
104
105    /**
106     * Returns the end y-value (as a double primitive) for an item within a
107     * series.
108     *
109     * @param series  the series (zero-based index).
110     * @param item  the item (zero-based index).
111     *
112     * @return The value.
113     */
114    @Override
115    public double getEndYValue(int series, int item) {
116        double result = Double.NaN;
117        Number y = getEndY(series, item);
118        if (y != null) {
119            result = y.doubleValue();
120        }
121        return result;
122    }
123
124}