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jfreechart example source code file (KeyedObject.java)

This example jfreechart source code file (KeyedObject.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

cloneable, clonenotsupportedexception, comparable, comparable, io, keyedobject, keyedobject, object, object, publiccloneable, publiccloneable, serializable

The jfreechart KeyedObject.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.]
 *
 * ----------------
 * KeyedObject.java
 * ----------------
 * (C) Copyright 2003-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 05-Feb-2003 : Version 1 (DG);
 * 27-Jan-2003 : Implemented Cloneable and Serializable, and added an equals()
 *               method (DG);
 *
 */

package org.jfree.data;

import java.io.Serializable;

import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A (key, object) pair.
 */
public class KeyedObject implements Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 2677930479256885863L;

    /** The key. */
    private Comparable key;

    /** The object. */
    private Object object;

    /**
     * Creates a new (key, object) pair.
     *
     * @param key  the key.
     * @param object  the object (<code>null permitted).
     */
    public KeyedObject(Comparable key, Object object) {
        this.key = key;
        this.object = object;
    }

    /**
     * Returns the key.
     *
     * @return The key.
     */
    public Comparable getKey() {
        return this.key;
    }

    /**
     * Returns the object.
     *
     * @return The object (possibly <code>null).
     */
    public Object getObject() {
        return this.object;
    }

    /**
     * Sets the object.
     *
     * @param object  the object (<code>null permitted).
     */
    public void setObject(Object object) {
        this.object = object;
    }

    /**
     * Returns a clone of this object.  It is assumed that the key is an
     * immutable object, so it is not deep-cloned.  The object is deep-cloned
     * if it implements {@link PublicCloneable}, otherwise a shallow clone is
     * made.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException if there is a problem cloning.
     */
    public Object clone() throws CloneNotSupportedException {
        KeyedObject clone = (KeyedObject) super.clone();
        if (this.object instanceof PublicCloneable) {
            PublicCloneable pc = (PublicCloneable) this.object;
            clone.object = pc.clone();
        }
        return clone;
    }

    /**
     * Tests if this object is equal to another.
     *
     * @param obj  the other object.
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {

        if (obj == this) {
            return true;
        }

        if (!(obj instanceof KeyedObject)) {
            return false;
        }
        KeyedObject that = (KeyedObject) obj;
        if (!ObjectUtilities.equal(this.key, that.key)) {
            return false;
        }

        if (!ObjectUtilities.equal(this.object, that.object)) {
            return false;
        }

        return true;
    }

}

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