org.jfree.chart3d.data.KeyedValue Maven / Gradle / Ivy

/* ===========================================================
 * Orson Charts : a 3D chart library for the Java(tm) platform
 * ===========================================================
 * 
 * (C)opyright 2013-2020, by Object Refinery Limited.  All rights reserved.
 * 
 * https://github.com/jfree/orson-charts
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 * 
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 * 
 * If you do not wish to be bound by the terms of the GPL, an alternative
 * commercial license can be purchased.  For details, please see visit the
 * Orson Charts home page:
 * 
 * http://www.object-refinery.com/orsoncharts/index.html
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 */

package org.jfree.chart3d.data;

/**
 * A {@code (key, value)} pair that is used as a building block for some
 * data structures for the charts.
 * 
 * @param   The key type.
 * @param   The value type.
 */
public interface KeyedValue, T> {
  
    /**
     * Returns the key (by design, this key is required to be 
     * non-{@code null}).
     * 
     * @return The key (never {@code null}). 
     */
    public K getKey();
  
    /**
     * Returns the value.
     * 
     * @return The value (possibly {@code null}). 
     */
    public T getValue();
  
}