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jfreechart example source code file (Series.java)

This example jfreechart source code file (Series.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

bean, clonenotsupportedexception, comparable, comparable, event, eventlistenerlist, gui, illegalargumentexception, io, javabean, null, object, object, propertychangesupport, serializable, series, series, string, string, swing

The jfreechart Series.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.]
 *
 * -----------
 * Series.java
 * -----------
 * (C) Copyright 2001-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 15-Nov-2001 : Version 1 (DG);
 * 29-Nov-2001 : Added cloning and property change support (DG);
 * 30-Jan-2002 : Added a description attribute and changed the constructors to
 *               protected (DG);
 * 07-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 13-Mar-2003 : Implemented Serializable (DG);
 * 01-May-2003 : Added equals() method (DG);
 * 26-Jun-2003 : Changed listener list to use EventListenerList - see bug
 *               757027 (DG);
 * 15-Oct-2003 : Added a flag to control whether or not change events are sent
 *               to registered listeners (DG);
 * 19-May-2005 : Made abstract (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 04-May-2006 : Updated API docs (DG);
 * 26-Sep-2007 : Added isEmpty() and getItemCount() methods (DG);
 *
 */

package org.jfree.data.general;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.Serializable;

import javax.swing.event.EventListenerList;

import org.jfree.util.ObjectUtilities;

/**
 * Base class representing a data series.  Subclasses are left to implement the
 * actual data structures.
 * <P>
 * The series has two properties ("Key" and "Description") for which you can
 * register a <code>PropertyChangeListener.
 * <P>
 * You can also register a {@link SeriesChangeListener} to receive notification
 * of changes to the series data.
 */
public abstract class Series implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -6906561437538683581L;

    /** The key for the series. */
    private Comparable key;

    /** A description of the series. */
    private String description;

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

    /** Object to support property change notification. */
    private PropertyChangeSupport propertyChangeSupport;

    /** A flag that controls whether or not changes are notified. */
    private boolean notify;

    /**
     * Creates a new series with the specified key.
     *
     * @param key  the series key (<code>null not permitted).
     */
    protected Series(Comparable key) {
        this(key, null);
    }

    /**
     * Creates a new series with the specified key and description.
     *
     * @param key  the series key (<code>null NOT permitted).
     * @param description  the series description (<code>null permitted).
     */
    protected Series(Comparable key, String description) {
        if (key == null) {
            throw new IllegalArgumentException("Null 'key' argument.");
        }
        this.key = key;
        this.description = description;
        this.listeners = new EventListenerList();
        this.propertyChangeSupport = new PropertyChangeSupport(this);
        this.notify = true;
    }

    /**
     * Returns the key for the series.
     *
     * @return The series key (never <code>null).
     *
     * @see #setKey(Comparable)
     */
    public Comparable getKey() {
        return this.key;
    }

    /**
     * Sets the key for the series and sends a <code>PropertyChangeEvent
     * (with the property name "Key") to all registered listeners.
     *
     * @param key  the key (<code>null not permitted).
     *
     * @see #getKey()
     */
    public void setKey(Comparable key) {
        if (key == null) {
            throw new IllegalArgumentException("Null 'key' argument.");
        }
        Comparable old = this.key;
        this.key = key;
        this.propertyChangeSupport.firePropertyChange("Key", old, key);
    }

    /**
     * Returns a description of the series.
     *
     * @return The series description (possibly <code>null).
     *
     * @see #setDescription(String)
     */
    public String getDescription() {
        return this.description;
    }

    /**
     * Sets the description of the series and sends a
     * <code>PropertyChangeEvent to all registered listeners.
     *
     * @param description  the description (<code>null permitted).
     *
     * @see #getDescription()
     */
    public void setDescription(String description) {
        String old = this.description;
        this.description = description;
        this.propertyChangeSupport.firePropertyChange("Description", old,
                description);
    }

    /**
     * Returns the flag that controls whether or not change events are sent to
     * registered listeners.
     *
     * @return A boolean.
     *
     * @see #setNotify(boolean)
     */
    public boolean getNotify() {
        return this.notify;
    }

    /**
     * Sets the flag that controls whether or not change events are sent to
     * registered listeners.
     *
     * @param notify  the new value of the flag.
     *
     * @see #getNotify()
     */
    public void setNotify(boolean notify) {
        if (this.notify != notify) {
            this.notify = notify;
            fireSeriesChanged();
        }
    }

    /**
     * Returns <code>true if the series contains no data items, and
     * <code>false otherwise.
     *
     * @return A boolean.
     *
     * @since 1.0.7
     */
    public boolean isEmpty() {
        return (getItemCount() == 0);
    }

    /**
     * Returns the number of data items in the series.
     *
     * @return The number of data items in the series.
     */
    public abstract int getItemCount();

    /**
     * Returns a clone of the series.
     * <P>
     * Notes:
     * <ul>
     * <li>No need to clone the name or description, since String object is
     * immutable.</li>
     * <li>We set the listener list to empty, since the listeners did not
     * register with the clone.</li>
     * <li>Same applies to the PropertyChangeSupport instance.
     * </ul>
     *
     * @return A clone of the series.
     *
     * @throws CloneNotSupportedException  not thrown by this class, but
     *         subclasses may differ.
     */
    public Object clone() throws CloneNotSupportedException {

        Series clone = (Series) super.clone();
        clone.listeners = new EventListenerList();
        clone.propertyChangeSupport = new PropertyChangeSupport(clone);
        return clone;

    }

    /**
     * Tests the series for equality with another object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return <code>true or false.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof Series)) {
            return false;
        }
        Series that = (Series) obj;
        if (!getKey().equals(that.getKey())) {
            return false;
        }
        if (!ObjectUtilities.equal(getDescription(), that.getDescription())) {
            return false;
        }
        return true;
    }

    /**
     * Returns a hash code.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result;
        result = this.key.hashCode();
        result = 29 * result + (this.description != null
                ? this.description.hashCode() : 0);
        return result;
    }

    /**
     * Registers an object with this series, to receive notification whenever
     * the series changes.
     * <P>
     * Objects being registered must implement the {@link SeriesChangeListener}
     * interface.
     *
     * @param listener  the listener to register.
     */
    public void addChangeListener(SeriesChangeListener listener) {
        this.listeners.add(SeriesChangeListener.class, listener);
    }

    /**
     * Deregisters an object, so that it not longer receives notification
     * whenever the series changes.
     *
     * @param listener  the listener to deregister.
     */
    public void removeChangeListener(SeriesChangeListener listener) {
        this.listeners.remove(SeriesChangeListener.class, listener);
    }

    /**
     * General method for signalling to registered listeners that the series
     * has been changed.
     */
    public void fireSeriesChanged() {
        if (this.notify) {
            notifyListeners(new SeriesChangeEvent(this));
        }
    }

    /**
     * Sends a change event to all registered listeners.
     *
     * @param event  contains information about the event that triggered the
     *               notification.
     */
    protected void notifyListeners(SeriesChangeEvent event) {

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

    }

    /**
     * Adds a property change listener to the series.
     *
     * @param listener  the listener.
     */
    public void addPropertyChangeListener(PropertyChangeListener listener) {
        this.propertyChangeSupport.addPropertyChangeListener(listener);
    }

    /**
     * Removes a property change listener from the series.
     *
     * @param listener The listener.
     */
    public void removePropertyChangeListener(PropertyChangeListener listener) {
        this.propertyChangeSupport.removePropertyChangeListener(listener);
    }

    /**
     * Fires a property change event.
     *
     * @param property  the property key.
     * @param oldValue  the old value.
     * @param newValue  the new value.
     */
    protected void firePropertyChange(String property, Object oldValue,
            Object newValue) {
        this.propertyChangeSupport.firePropertyChange(property, oldValue,
                newValue);
    }

}

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