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jfreechart example source code file (DefaultValueDataset.java)

This example jfreechart source code file (DefaultValueDataset.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

abstractdataset, cloneable, datasetchangeevent, defaultvaluedataset, defaultvaluedataset, double, io, number, number, publiccloneable, publiccloneable, serializable, valuedataset, valuedataset

The jfreechart DefaultValueDataset.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.]
 *
 * ------------------------
 * DefaultValueDataset.java
 * ------------------------
 * (C) Copyright 2003-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 27-Mar-2003 : Version 1 (DG);
 * 18-Aug-2003 : Implemented Cloneable (DG);
 * 03-Mar-2005 : Implemented PublicCloneable (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 30-Jan-2007 : Added explicit super() call in constructor (for clarity) (DG);
 *
 */

package org.jfree.data.general;

import java.io.Serializable;

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

/**
 * A dataset that stores a single value (that is possibly <code>null).
 * This class provides a default implementation of the {@link ValueDataset}
 * interface.
 */
public class DefaultValueDataset extends AbstractDataset
        implements ValueDataset, Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 8137521217249294891L;

    /** The value. */
    private Number value;

    /**
     * Constructs a new dataset, initially empty.
     */
    public DefaultValueDataset() {
        this(null);
    }

    /**
     * Creates a new dataset with the specified value.
     *
     * @param value  the value.
     */
    public DefaultValueDataset(double value) {
        this(new Double(value));
    }

    /**
     * Creates a new dataset with the specified value.
     *
     * @param value  the initial value (<code>null permitted).
     */
    public DefaultValueDataset(Number value) {
        super();
        this.value = value;
    }

    /**
     * Returns the value.
     *
     * @return The value (possibly <code>null).
     */
    public Number getValue() {
        return this.value;
    }

    /**
     * Sets the value and sends a {@link DatasetChangeEvent} to all registered
     * listeners.
     *
     * @param value  the new value (<code>null permitted).
     */
    public void setValue(Number value) {
        this.value = value;
        notifyListeners(new DatasetChangeEvent(this, this));
    }

    /**
     * Tests this dataset for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (obj instanceof ValueDataset) {
            ValueDataset vd = (ValueDataset) obj;
            return ObjectUtilities.equal(this.value, vd.getValue());
        }
        return false;
    }

    /**
     * Returns a hash code.
     *
     * @return A hash code.
     */
    public int hashCode() {
        return (this.value != null ? this.value.hashCode() : 0);
    }

}

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