home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

jfreechart example source code file (AbstractDialLayer.java)

This example jfreechart source code file (AbstractDialLayer.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

abstractdiallayer, abstractdiallayer, classnotfoundexception, clonenotsupportedexception, clonenotsupportedexception, diallayer, diallayerchangeevent, diallayerchangelistener, event, eventlistenerlist, eventlistenerlist, gui, io, ioexception, list, object, object, swing, util

The jfreechart AbstractDialLayer.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.]
 *
 * ----------------------
 * AbstractDialLayer.java
 * ----------------------
 * (C) Copyright 2006-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 06-Nov-2006 : Version 1 (DG);
 * 17-Nov-2006 : Added visible flag (DG);
 * 16-Oct-2007 : Implemented equals() and clone() (DG);
 *
 */

package org.jfree.chart.plot.dial;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.Arrays;
import java.util.EventListener;
import java.util.List;

import javax.swing.event.EventListenerList;

import org.jfree.chart.HashUtilities;

/**
 * A base class that can be used to implement a {@link DialLayer}.  It includes
 * an event notification mechanism.
 *
 * @since 1.0.7
 */
public abstract class AbstractDialLayer implements DialLayer {

    /** A flag that controls whether or not the layer is visible. */
    private boolean visible;

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

    /**
     * Creates a new instance.
     */
    protected AbstractDialLayer() {
        this.visible = true;
        this.listenerList = new EventListenerList();
    }

    /**
     * Returns <code>true if this layer is visible (should be displayed),
     * and <code>false otherwise.
     *
     * @return A boolean.
     *
     * @see #setVisible(boolean)
     */
    public boolean isVisible() {
        return this.visible;
    }

    /**
     * Sets the flag that determines whether or not this layer is drawn by
     * the plot, and sends a {@link DialLayerChangeEvent} to all registered
     * listeners.
     *
     * @param visible  the flag.
     *
     * @see #isVisible()
     */
    public void setVisible(boolean visible) {
        this.visible = visible;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Tests this instance 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 AbstractDialLayer)) {
            return false;
        }
        AbstractDialLayer that = (AbstractDialLayer) obj;
        return this.visible == that.visible;
    }

    /**
     * Returns a hash code for this instance.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result = 23;
        result = HashUtilities.hashCode(result, this.visible);
        return result;
    }

    /**
     * Returns a clone of this instance.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException if there is a problem cloning this
     *     instance.
     */
    public Object clone() throws CloneNotSupportedException {
        AbstractDialLayer clone = (AbstractDialLayer) super.clone();
        // we don't clone the listeners
        clone.listenerList = new EventListenerList();
        return clone;
    }

    /**
     * Registers an object for notification of changes to the dial layer.
     *
     * @param listener  the object that is being registered.
     *
     * @see #removeChangeListener(DialLayerChangeListener)
     */
    public void addChangeListener(DialLayerChangeListener listener) {
        this.listenerList.add(DialLayerChangeListener.class, listener);
    }

    /**
     * Deregisters an object for notification of changes to the dial layer.
     *
     * @param listener  the object to deregister.
     *
     * @see #addChangeListener(DialLayerChangeListener)
     */
    public void removeChangeListener(DialLayerChangeListener listener) {
        this.listenerList.remove(DialLayerChangeListener.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.
     */
    public boolean hasListener(EventListener listener) {
        List list = Arrays.asList(this.listenerList.getListenerList());
        return list.contains(listener);
    }

    /**
     * Notifies all registered listeners that the dial layer has changed.
     * The {@link DialLayerChangeEvent} provides information about the change.
     *
     * @param event  information about the change to the axis.
     */
    protected void notifyListeners(DialLayerChangeEvent event) {
        Object[] listeners = this.listenerList.getListenerList();
        for (int i = listeners.length - 2; i >= 0; i -= 2) {
            if (listeners[i] == DialLayerChangeListener.class) {
                ((DialLayerChangeListener) listeners[i + 1]).dialLayerChanged(
                        event);
            }
        }
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the input stream.
     *
     * @throws IOException  if there is an I/O error.
     * @throws ClassNotFoundException  if there is a classpath problem.
     */
    private void readObject(ObjectInputStream stream)
        throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        this.listenerList = new EventListenerList();
    }

}

Other jfreechart examples (source code examples)

Here is a short list of links related to this jfreechart AbstractDialLayer.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.