This program demonstrates the transfer of serialized objects between virtual machines : Serialization « File Input Output « Java





This program demonstrates the transfer of serialized objects between virtual machines

   

/*
   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;
}

   
    
    
  










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