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jfreechart example source code file (ChartTransferable.java)

This example jfreechart source code file (ChartTransferable.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

awt, charttransferable, charttransferable, clonenotsupportedexception, dataflavor, dataflavor, datatransfer, image, io, ioexception, jfreechart, jfreechart, object, transferable, unsupportedflavorexception, unsupportedflavorexception

The jfreechart ChartTransferable.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2009, 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.]
 *
 * -------------------
 * ChartSelection.java
 * -------------------
 * (C) Copyright 2009, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 08-Apr-2009 : Version 1, with inspiration from patch 1460845 (DG);
 *
 */

package org.jfree.chart;

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;

/**
 * A class used to represent a chart on the clipboard.
 *
 * @since 1.0.13
 */
public class ChartTransferable implements Transferable {

    /** The data flavor. */
    final DataFlavor imageFlavor = new DataFlavor(
            "image/x-java-image; class=java.awt.Image", "Image");    
    
    /** The chart. */
    private JFreeChart chart;

    /** The width of the chart on the clipboard. */
    private int width;

    /** The height of the chart on the clipboard. */
    private int height;

    /**
     * Creates a new chart selection.
     *
     * @param chart  the chart.
     * @param width  the chart width.
     * @param height  the chart height.
     */
    public ChartTransferable(JFreeChart chart, int width, int height) {
        this(chart, width, height, true);
    }

    /**
     * Creates a new chart selection.
     *
     * @param chart  the chart.
     * @param width  the chart width.
     * @param height  the chart height.
     * @param cloneData  clone the dataset(s)?
     */
    public ChartTransferable(JFreeChart chart, int width, int height,
            boolean cloneData) {

        // we clone the chart because presumably there can be some delay
        // between putting this instance on the system clipboard and
        // actually having the getTransferData() method called...
        try {
            this.chart = (JFreeChart) chart.clone();
        }
        catch (CloneNotSupportedException e) {
            this.chart = chart;
        }
        this.width = width;
        this.height = height;
        // FIXME: we've cloned the chart, but the dataset(s) aren't cloned
        // and we should do that
    }

    /**
     * Returns the data flavors supported.
     * 
     * @return The data flavors supported.
     */
    public DataFlavor[] getTransferDataFlavors() {
        return new DataFlavor[] {this.imageFlavor};
    }

    /**
     * Returns <code>true if the specified flavor is supported.
     *
     * @param flavor  the flavor.
     *
     * @return A boolean.
     */
    public boolean isDataFlavorSupported(DataFlavor flavor) {
        return this.imageFlavor.equals(flavor);
    }

    /**
     * Returns the content for the requested flavor, if it is supported.
     *
     * @param flavor  the requested flavor.
     *
     * @return The content.
     *
     * @throws java.awt.datatransfer.UnsupportedFlavorException
     * @throws java.io.IOException
     */
    public Object getTransferData(DataFlavor flavor)
            throws UnsupportedFlavorException, IOException {
        
        if (this.imageFlavor.equals(flavor)) {
            return this.chart.createBufferedImage(width, height);
        }
        else {
            throw new UnsupportedFlavorException(flavor);
        }
    }

}

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