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jfreechart example source code file (DefaultKeyedValueDataset.java)

This example jfreechart source code file (DefaultKeyedValueDataset.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

clonenotsupportedexception, comparable, comparable, datasetchangeevent, defaultkeyedvalue, defaultkeyedvaluedataset, defaultkeyedvaluedataset, io, keyedvaluedataset, keyedvaluedataset, number, number, object, runtimeexception, serializable

The jfreechart DefaultKeyedValueDataset.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.]
 *
 * -----------------------------
 * DefaultKeyedValueDataset.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);
 *
 */

package org.jfree.data.general;

import java.io.Serializable;

import org.jfree.data.DefaultKeyedValue;
import org.jfree.data.KeyedValue;
import org.jfree.util.ObjectUtilities;

/**
 * A default implementation of the {@link KeyedValueDataset} interface.
 */
public class DefaultKeyedValueDataset extends AbstractDataset
        implements KeyedValueDataset, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -8149484339560406750L;

    /** Storage for the data. */
    private KeyedValue data;

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

    /**
     * Creates a new dataset with the specified initial value.
     *
     * @param key  the key.
     * @param value  the value (<code>null permitted).
     */
    public DefaultKeyedValueDataset(Comparable key, Number value) {
        this(new DefaultKeyedValue(key, value));
    }

    /**
     * Creates a new dataset that uses the data from a {@link KeyedValue}
     * instance.
     *
     * @param data  the data (<code>null permitted).
     */
    public DefaultKeyedValueDataset(KeyedValue data) {
        this.data = data;
    }

    /**
     * Returns the key associated with the value, or <code>null if the
     * dataset has no data item.
     *
     * @return The key.
     */
    public Comparable getKey() {
        Comparable result = null;
        if (this.data != null) {
            result = this.data.getKey();
        }
        return result;
    }

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

    /**
     * Updates the value.
     *
     * @param value  the new value (<code>null permitted).
     */
    public void updateValue(Number value) {
        if (this.data == null) {
            throw new RuntimeException("updateValue: can't update null.");
        }
        setValue(this.data.getKey(), value);
    }

    /**
     * Sets the value for the dataset and sends a {@link DatasetChangeEvent} to
     * all registered listeners.
     *
     * @param key  the key.
     * @param value  the value (<code>null permitted).
     */
    public void setValue(Comparable key, Number value) {
        this.data = new DefaultKeyedValue(key, 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 KeyedValueDataset)) {
            return false;
        }
        KeyedValueDataset that = (KeyedValueDataset) obj;
        if (this.data == null) {
            if (that.getKey() != null || that.getValue() != null) {
                return false;
            }
            return true;
        }
        if (!ObjectUtilities.equal(this.data.getKey(), that.getKey())) {
            return false;
        }
        if (!ObjectUtilities.equal(this.data.getValue(), that.getValue())) {
            return false;
        }
        return true;
    }

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

    /**
     * Creates a clone of the dataset.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException This class will not throw this
     *         exception, but subclasses (if any) might.
     */
    public Object clone() throws CloneNotSupportedException {
        DefaultKeyedValueDataset clone
                = (DefaultKeyedValueDataset) super.clone();
        return clone;
    }

}

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