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jfreechart example source code file (AbstractDataset.java)

This example jfreechart source code file (AbstractDataset.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, abstractdataset, classnotfoundexception, clonenotsupportedexception, datasetchangeevent, datasetgroup, datasetgroup, event, eventlistenerlist, eventlistenerlist, gui, io, ioexception, object, object, objectinputvalidation, serializable, swing, util

The jfreechart AbstractDataset.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.]
 *
 * --------------------
 * AbstractDataset.java
 * --------------------
 * (C)opyright 2000-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Nicolas Brodu (for Astrium and EADS Corporate Research
 *                   Center);
 *
 * Changes (from 21-Aug-2001)
 * --------------------------
 * 21-Aug-2001 : Added standard header. Fixed DOS encoding problem (DG);
 * 18-Sep-2001 : Updated e-mail address in header (DG);
 * 15-Oct-2001 : Moved to new package (com.jrefinery.data.*) (DG);
 * 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc. (DG);
 * 17-Nov-2001 : Changed constructor from public to protected, created new
 *               AbstractSeriesDataset class and transferred series-related
 *               methods, updated Javadoc comments (DG);
 * 04-Mar-2002 : Updated import statements (DG);
 * 11-Jun-2002 : Updated for change in the event constructor (DG);
 * 07-Aug-2002 : Changed listener list to use
 *               javax.swing.event.EventListenerList (DG);
 * 04-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 27-Mar-2003 : Implemented Serializable (DG);
 * 18-Aug-2003 : Implemented Cloneable (DG);
 * 08-Sep-2003 : Serialization fixes (NB);
 * 11-Sep-2003 : Cloning Fixes (NB);
 * 01-Jun-2005 : Added hasListener() method for unit testing (DG);
 *
 */

package org.jfree.data.general;

import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.ObjectInputValidation;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Arrays;
import java.util.EventListener;
import java.util.List;

import javax.swing.event.EventListenerList;

/**
 * An abstract implementation of the {@link Dataset} interface, containing a
 * mechanism for registering change listeners.
 */
public abstract class AbstractDataset implements Dataset, Cloneable,
        Serializable, ObjectInputValidation {

    /** For serialization. */
    private static final long serialVersionUID = 1918768939869230744L;

    /** The group that the dataset belongs to. */
    private DatasetGroup group;

    /** Storage for registered change listeners. */
    private transient EventListenerList listenerList;

    /**
     * Constructs a dataset. By default, the dataset is assigned to its own
     * group.
     */
    protected AbstractDataset() {
        this.group = new DatasetGroup();
        this.listenerList = new EventListenerList();
    }

    /**
     * Returns the dataset group for the dataset.
     *
     * @return The group (never <code>null).
     *
     * @see #setGroup(DatasetGroup)
     */
    public DatasetGroup getGroup() {
        return this.group;
    }

    /**
     * Sets the dataset group for the dataset.
     *
     * @param group  the group (<code>null not permitted).
     *
     * @see #getGroup()
     */
    public void setGroup(DatasetGroup group) {
        if (group == null) {
            throw new IllegalArgumentException("Null 'group' argument.");
        }
        this.group = group;
    }

    /**
     * Registers an object to receive notification of changes to the dataset.
     *
     * @param listener  the object to register.
     *
     * @see #removeChangeListener(DatasetChangeListener)
     */
    public void addChangeListener(DatasetChangeListener listener) {
        this.listenerList.add(DatasetChangeListener.class, listener);
    }

    /**
     * Deregisters an object so that it no longer receives notification of
     * changes to the dataset.
     *
     * @param listener  the object to deregister.
     *
     * @see #addChangeListener(DatasetChangeListener)
     */
    public void removeChangeListener(DatasetChangeListener listener) {
        this.listenerList.remove(DatasetChangeListener.class, listener);
    }

    /**
     * Returns <code>true if the specified object is registered with
     * the dataset as a listener.  Most applications won't need to call this
     * method, it exists mainly for use by unit testing code.
     *
     * @param listener  the listener.
     *
     * @return A boolean.
     *
     * @see #addChangeListener(DatasetChangeListener)
     * @see #removeChangeListener(DatasetChangeListener)
     */
    public boolean hasListener(EventListener listener) {
        List list = Arrays.asList(this.listenerList.getListenerList());
        return list.contains(listener);
    }

    /**
     * Notifies all registered listeners that the dataset has changed.
     *
     * @see #addChangeListener(DatasetChangeListener)
     */
    protected void fireDatasetChanged() {
        notifyListeners(new DatasetChangeEvent(this, this));
    }

    /**
     * Notifies all registered listeners that the dataset has changed.
     *
     * @param event  contains information about the event that triggered the
     *               notification.
     *
     * @see #addChangeListener(DatasetChangeListener)
     * @see #removeChangeListener(DatasetChangeListener)
     */
    protected void notifyListeners(DatasetChangeEvent event) {

        Object[] listeners = this.listenerList.getListenerList();
        for (int i = listeners.length - 2; i >= 0; i -= 2) {
            if (listeners[i] == DatasetChangeListener.class) {
                ((DatasetChangeListener) listeners[i + 1]).datasetChanged(
                        event);
            }
        }

    }

    /**
     * Returns a clone of the dataset. The cloned dataset will NOT include the
     * {@link DatasetChangeListener} references that have been registered with
     * this dataset.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException  if the dataset does not support
     *                                     cloning.
     */
    public Object clone() throws CloneNotSupportedException {
        AbstractDataset clone = (AbstractDataset) super.clone();
        clone.listenerList = new EventListenerList();
        return clone;
    }

    /**
     * Handles serialization.
     *
     * @param stream  the output stream.
     *
     * @throws IOException if there is an I/O problem.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
    }

    /**
     * Restores a serialized object.
     *
     * @param stream  the input stream.
     *
     * @throws IOException if there is an I/O problem.
     * @throws ClassNotFoundException if there is a problem loading a class.
     */
    private void readObject(ObjectInputStream stream)
        throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        this.listenerList = new EventListenerList();
        stream.registerValidation(this, 10);  // see comments about priority of
                                              // 10 in validateObject()
    }

    /**
     * Validates the object. We use this opportunity to call listeners who have
     * registered during the deserialization process, as listeners are not
     * serialized. This method is called by the serialization system after the
     * entire graph is read.
     *
     * This object has registered itself to the system with a priority of 10.
     * Other callbacks may register with a higher priority number to be called
     * before this object, or with a lower priority number to be called after
     * the listeners were notified.
     *
     * All listeners are supposed to have register by now, either in their
     * readObject or validateObject methods. Notify them that this dataset has
     * changed.
     *
     * @exception InvalidObjectException If the object cannot validate itself.
     */
    public void validateObject() throws InvalidObjectException {
        fireDatasetChanged();
    }

}

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