SerialTransferTest.java Source code

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Here is the source code for SerialTransferTest.java

Source

/*
   This program is a part of the companion code for Core Java 8th ed.
   (http://horstmann.com/corejava)
    
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
    
   This program 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 General Public License for more details.
    
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.Serializable;

import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

/**
 * This program demonstrates the transfer of serialized objects between virtual machines.
 * @version 1.02 2007-08-16
 * @author Cay Horstmann
 */
public class SerialTransferTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                JFrame frame = new SerialTransferFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}

/**
 * This frame contains a color chooser, and copy and paste buttons.
 */
class SerialTransferFrame extends JFrame {
    public SerialTransferFrame() {
        setTitle("SerialTransferTest");

        chooser = new JColorChooser();
        add(chooser, BorderLayout.CENTER);
        JPanel panel = new JPanel();

        JButton copyButton = new JButton("Copy");
        panel.add(copyButton);
        copyButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                copy();
            }
        });

        JButton pasteButton = new JButton("Paste");
        panel.add(pasteButton);
        pasteButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                paste();
            }
        });

        add(panel, BorderLayout.SOUTH);
        pack();
    }

    /**
     * Copies the chooser's color into the system clipboard.
     */
    private void copy() {
        Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
        Color color = chooser.getColor();
        SerialTransferable selection = new SerialTransferable(color);
        clipboard.setContents(selection, null);
    }

    /**
     * Pastes the color from the system clipboard into the chooser.
     */
    private void paste() {
        Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
        try {
            DataFlavor flavor = new DataFlavor("application/x-java-serialized-object;class=java.awt.Color");
            if (clipboard.isDataFlavorAvailable(flavor)) {
                Color color = (Color) clipboard.getData(flavor);
                chooser.setColor(color);
            }
        } catch (ClassNotFoundException e) {
            JOptionPane.showMessageDialog(this, e);
        } catch (UnsupportedFlavorException e) {
            JOptionPane.showMessageDialog(this, e);
        } catch (IOException e) {
            JOptionPane.showMessageDialog(this, e);
        }
    }

    private JColorChooser chooser;
}

/**
 * This class is a wrapper for the data transfer of serialized objects.
 */
class SerialTransferable implements Transferable {
    /**
     * Constructs the selection.
     * @param o any serializable object
     */
    SerialTransferable(Serializable o) {
        obj = o;
    }

    public DataFlavor[] getTransferDataFlavors() {
        DataFlavor[] flavors = new DataFlavor[2];
        Class<?> type = obj.getClass();
        String mimeType = "application/x-java-serialized-object;class=" + type.getName();
        try {
            flavors[0] = new DataFlavor(mimeType);
            flavors[1] = DataFlavor.stringFlavor;
            return flavors;
        } catch (ClassNotFoundException e) {
            return new DataFlavor[0];
        }
    }

    public boolean isDataFlavorSupported(DataFlavor flavor) {
        return DataFlavor.stringFlavor.equals(flavor) || "application".equals(flavor.getPrimaryType())
                && "x-java-serialized-object".equals(flavor.getSubType())
                && flavor.getRepresentationClass().isAssignableFrom(obj.getClass());
    }

    public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException {
        if (!isDataFlavorSupported(flavor))
            throw new UnsupportedFlavorException(flavor);

        if (DataFlavor.stringFlavor.equals(flavor))
            return obj.toString();

        return obj;
    }

    private Serializable obj;
}