001    /* ===========================================================
002     * JFreeChart : a free chart library for the Java(tm) platform
003     * ===========================================================
004     *
005     * (C) Copyright 2000-2007, 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     * IntervalCategoryDataset.java
029     * ----------------------------
030     * (C) Copyright 2002-2007, by Eduard Martinescu and Contributors.
031     *
032     * Original Author:  Eduard Martinescu;
033     * Contributor(s):   David Gilbert (for Object Refinery Limited);
034     *
035     * Changes
036     * -------
037     * 19-Mar-2002 : Version 1 contributed by Eduard Martinescu.  The interface 
038     *               name and method names have been renamed to be consistent with 
039     *               existing interfaces (DG);
040     * 06-Jun-2002 : Updated Javadoc comments (DG);
041     * 24-Oct-2002 : Categories and series are now indexed by int or Comparable, 
042     *               following changes made to the CategoryDataset interface (DG);
043     *
044     */
045    
046    package org.jfree.data.category;
047    
048    
049    /**
050     * A category dataset that defines a value range for each series/category 
051     * combination.
052     */
053    public interface IntervalCategoryDataset extends CategoryDataset {
054    
055        /**
056         * Returns the start value for the interval for a given series and category.
057         *
058         * @param series  the series (zero-based index).
059         * @param category  the category (zero-based index).
060         *
061         * @return The start value (possibly <code>null</code>).
062         */
063        public Number getStartValue(int series, int category);
064    
065        /**
066         * Returns the start value for the interval for a given series and category.
067         *
068         * @param series  the series key.
069         * @param category  the category key.
070         *
071         * @return The start value (possibly <code>null</code>).
072         */
073        public Number getStartValue(Comparable series, Comparable category);
074    
075        /**
076         * Returns the end value for the interval for a given series and category.
077         *
078         * @param series  the series (zero-based index).
079         * @param category  the category (zero-based index).
080         *
081         * @return The end value (possibly <code>null</code>).
082         */
083        public Number getEndValue(int series, int category);
084    
085        /**
086         * Returns the end value for the interval for a given series and category.
087         *
088         * @param series  the series key.
089         * @param category  the category key.
090         *
091         * @return The end value (possibly <code>null</code>).
092         */
093        public Number getEndValue(Comparable series, Comparable category);
094    
095    }