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jfreechart example source code file (KeyedValues.java)

This example jfreechart source code file (KeyedValues.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

comparable, comparable, keyedvalues, list, list, number, number, util, values, values

The jfreechart KeyedValues.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ----------------
 * KeyedValues.java
 * ----------------
 * (C) Copyright 2002-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 23-Oct-2002 : Version 1 (DG);
 * 12-Jan-2005 : Updated Javadocs to specify new behaviour when key
 *               is not recognised (DG);
 * ------------- JFREECHART 1.0.0 ---------------------------------------------
 * 02-May-2006 : Updated API docs (DG);
 *
 */

package org.jfree.data;

import java.util.List;

/**
 * An ordered list of (key, value) items where the keys are unique and
 * non-<code>null.
 *
 * @see Values
 * @see DefaultKeyedValues
 */
public interface KeyedValues extends Values {

    /**
     * Returns the key associated with the item at a given position.  Note
     * that some implementations allow re-ordering of the data items, so the
     * result may be transient.
     *
     * @param index  the item index (in the range <code>0 to
     *     <code>getItemCount() - 1).
     *
     * @return The key (never <code>null).
     *
     * @throws IndexOutOfBoundsException if <code>index is not in the
     *     specified range.
     */
    public Comparable getKey(int index);

    /**
     * Returns the index for a given key.
     *
     * @param key  the key (<code>null not permitted).
     *
     * @return The index, or <code>-1 if the key is unrecognised.
     *
     * @throws IllegalArgumentException if <code>key is
     *     <code>null.
     */
    public int getIndex(Comparable key);

    /**
     * Returns the keys for the values in the collection.  Note that you can
     * access the values in this collection by key or by index.  For this
     * reason, the key order is important - this method should return the keys
     * in order.  The returned list may be unmodifiable.
     *
     * @return The keys (never <code>null).
     */
    public List getKeys();

    /**
     * Returns the value for a given key.
     *
     * @param key  the key.
     *
     * @return The value (possibly <code>null).
     *
     * @throws UnknownKeyException if the key is not recognised.
     */
    public Number getValue(Comparable key);

}

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