001/* ======================================================
002 * JFreeChart : a chart library for the Java(tm) platform
003 * ======================================================
004 *
005 * (C) Copyright 2000-present, by David Gilbert and Contributors.
006 *
007 * Project Info:  https://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-present, by David Gilbert.
031 *
032 * Original Author:  David Gilbert.
033 * Contributor(s):   -;
034 *
035 */
036
037package org.jfree.data.xy;
038
039/**
040 * An base class that you can use to create new implementations of the
041 * {@link IntervalXYDataset} interface.
042 */
043public abstract class AbstractIntervalXYDataset extends AbstractXYDataset
044        implements IntervalXYDataset {
045
046    /**
047     * Creates a new empty dataset.
048     */
049    protected AbstractIntervalXYDataset() {
050        super();
051    }
052
053    /**
054     * Returns the start x-value (as a double primitive) for an item within a
055     * series.
056     *
057     * @param series  the series index (zero-based).
058     * @param item  the item index (zero-based).
059     *
060     * @return The value.
061     */
062    @Override
063    public double getStartXValue(int series, int item) {
064        double result = Double.NaN;
065        Number x = getStartX(series, item);
066        if (x != null) {
067            result = x.doubleValue();
068        }
069        return result;
070    }
071
072    /**
073     * Returns the end x-value (as a double primitive) for an item within a
074     * series.
075     *
076     * @param series  the series index (zero-based).
077     * @param item  the item index (zero-based).
078     *
079     * @return The value.
080     */
081    @Override
082    public double getEndXValue(int series, int item) {
083        double result = Double.NaN;
084        Number x = getEndX(series, item);
085        if (x != null) {
086            result = x.doubleValue();
087        }
088        return result;
089    }
090
091    /**
092     * Returns the start y-value (as a double primitive) for an item within a
093     * series.
094     *
095     * @param series  the series index (zero-based).
096     * @param item  the item index (zero-based).
097     *
098     * @return The value.
099     */
100    @Override
101    public double getStartYValue(int series, int item) {
102        double result = Double.NaN;
103        Number y = getStartY(series, item);
104        if (y != null) {
105            result = y.doubleValue();
106        }
107        return result;
108    }
109
110    /**
111     * Returns the end y-value (as a double primitive) for an item within a
112     * series.
113     *
114     * @param series  the series (zero-based index).
115     * @param item  the item (zero-based index).
116     *
117     * @return The value.
118     */
119    @Override
120    public double getEndYValue(int series, int item) {
121        double result = Double.NaN;
122        Number y = getEndY(series, item);
123        if (y != null) {
124            result = y.doubleValue();
125        }
126        return result;
127    }
128
129}