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     * AbstractIntervalXYDataset.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: AbstractIntervalXYDataset.java,v 1.3.2.1 2005/10/25 21:36:51 mungady Exp $
036     *
037     * Changes
038     * -------
039     * 05-May-2004 : Version 1 (DG);
040     * 15-Jul-2004 : Switched getStartX() and getStartXValue() methods and 
041     *               others (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    
049    /**
050     * An base class that you can use to create new implementations of the 
051     * {@link IntervalXYDataset} interface.
052     */
053    public abstract class AbstractIntervalXYDataset extends AbstractXYDataset 
054                                                    implements IntervalXYDataset {
055    
056        /**
057         * Returns the start x-value (as a double primitive) for an item within a 
058         * series.
059         * 
060         * @param series  the series index (zero-based).
061         * @param item  the item index (zero-based).
062         * 
063         * @return The value.
064         */
065        public double getStartXValue(int series, int item) {
066            double result = Double.NaN;
067            Number x = getStartX(series, item);
068            if (x != null) {
069                result = x.doubleValue();   
070            }
071            return result;   
072        }
073    
074        /**
075         * Returns the end x-value (as a double primitive) for an item within a 
076         * series.
077         * 
078         * @param series  the series index (zero-based).
079         * @param item  the item index (zero-based).
080         * 
081         * @return The value.
082         */
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        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        public double getEndYValue(int series, int item) {
120            double result = Double.NaN;
121            Number y = getEndY(series, item);
122            if (y != null) {
123                result = y.doubleValue();   
124            }
125            return result;   
126        }
127    
128    }