001/* ===========================================================
002 * Orson Charts : a 3D chart library for the Java(tm) platform
003 * ===========================================================
004 * 
005 * (C)opyright 2013-2022, by David Gilbert.  All rights reserved.
006 * 
007 * https://github.com/jfree/orson-charts
008 * 
009 * This program is free software: you can redistribute it and/or modify
010 * it under the terms of the GNU General Public License as published by
011 * the Free Software Foundation, either version 3 of the License, or
012 * (at your option) any later version.
013 *
014 * This program is distributed in the hope that it will be useful,
015 * but WITHOUT ANY WARRANTY; without even the implied warranty of
016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017 * GNU General Public License for more details.
018 *
019 * You should have received a copy of the GNU General Public License
020 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
021 * 
022 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
023 * Other names may be trademarks of their respective owners.]
024 * 
025 * If you do not wish to be bound by the terms of the GPL, an alternative
026 * commercial license can be purchased.  For details, please see visit the
027 * Orson Charts home page:
028 * 
029 * http://www.object-refinery.com/orsoncharts/index.html
030 * 
031 */
032
033package org.jfree.chart3d.data;
034
035/**
036 * A generic representation of a one dimensional list of data values.
037 * 
038 * @param <T> The value type.
039 */
040public interface Values<T> {
041    
042    /**
043     * Returns the number of items in the dataset.
044     *
045     * @return The number of items in the dataset.
046     */
047    int getItemCount();
048
049    /**
050     * Returns the value for the specified item.
051     *
052     * @param item  the item index.
053     *
054     * @return The value for the specified item (possibly {@code null}).
055     */
056    T getValue(int item);
057  
058    /**
059     * Returns the value for the specified item as a double primitive, provided
060     * that the data type is a subclass of {@code Number}.  Where
061     * the {@link #getValue(int)} method returns {@code null}, this method
062     * returns {@code Double.NaN}.
063     * 
064     * @param item  the item index.
065     * 
066     * @return The value for the specified item. 
067     */
068    double getDoubleValue(int item);
069
070}