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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D APIs, it currently supports bar charts, pie charts, line charts, XY-plots and time series plots.
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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2013, 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.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 * ------------------
 * ContourEntity.java
 * ------------------
 * (C) Copyright 2002-2008, by David M. O'Donnell and Contributors.
 *
 * Original Author:  David M. O'Donnell;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 26-Nov-2002 : Version 1 contributed by David M. O'Donnell (DG);
 * 20-May-2004 : Added equals() and clone() methods and implemented
 *               Serializable (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
 *
 */

package org.jfree.chart.entity;

import java.awt.Shape;
import java.io.Serializable;

import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYBlockRenderer;

/**
 * Represents an item on a contour chart.
 *
 * @deprecated This class is no longer supported (as of version 1.0.4).  If
 *     you are creating contour plots, please try to use {@link XYPlot} and
 *     {@link XYBlockRenderer}.
 */
public class ContourEntity extends ChartEntity
                           implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 1249570520505992847L;

    /** Holds the index into the dataset for this entity. */
    private int index = -1;

    /**
     * Constructor for ContourEntity.
     *
     * @param area  the area.
     * @param toolTipText  the tooltip text.
     */
    public ContourEntity(Shape area, String toolTipText) {
        super(area, toolTipText);
    }

    /**
     * Constructor for ContourEntity.
     *
     * @param area  the area.
     * @param toolTipText  the tooltip text.
     * @param urlText  the URL text.
     */
    public ContourEntity(Shape area, String toolTipText, String urlText) {
        super(area, toolTipText, urlText);
    }

    /**
     * Returns the index.
     *
     * @return The index.
     */
    public int getIndex() {
        return this.index;
    }

    /**
     * Sets the index.
     *
     * @param index  the index.
     */
    public void setIndex(int index) {
        this.index = index;
    }

    /**
     * Tests the entity for equality with an arbitrary object.
     *
     * @param obj  the object (null permitted).
     *
     * @return A boolean.
     */
    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (obj instanceof ContourEntity && super.equals(obj)) {
            ContourEntity ce = (ContourEntity) obj;
            if (this.index != ce.index) {
                return false;
            }
            return true;
        }
        return false;
    }

    /**
     * Returns a clone of the entity.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException if cloning is not supported.
     */
    @Override
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

}