import java.io.*;
import javax.swing.*;
/**
* The class Serialization provides methods for
* saving objects to files and loading objects from files.
* The implementation is based on code from <I>Java Examples in a nutshell</I>.
* <BR><B>Examples of use:</B><BR>
* <PRE>
* try {
* Serializable o = ...;
* Serialization.save( o, "object.ser" );
* ...
* Serializable u = Serialization.load( "object.ser" );
* ...
* Serializable v = Serialization.load( Serialization.loadFile() ); // interactive loading
* ...
* Serializable copy = Serialization.deepclone( u ); // bit for bit copy of u
* }
* catch ( IOException ioe ) {} // load and save may throw IOExceptions.
* <PRE>
* @author Carsten Knudsen
* @version 1.0
**/
public class Serialization {
/**
* The class Serialization only has a private constructor
* to prevent instantiation.
* Use the class through its static methods.
**/
private Serialization() {
} // constructor
/**
* Saves the serializable object o to the named file.
**/
public static void save( Serializable o, String name ) throws IOException {
save( o, new File( name ) );
} // save
/**
* Saves the serializable object o to the File object.
**/
public static void save( Serializable o, File file ) throws IOException {
ObjectOutputStream out = new ObjectOutputStream( new FileOutputStream( file ) );
out.writeObject( o );
out.close();
} // save
/**
* Loads a serializable object from the named file.
**/
public static Serializable load( String name ) throws IOException, ClassNotFoundException {
return load( new File( name ) );
} // save
/**
* Loads a serializable object from the File object.
**/
public static Serializable load( File file ) throws IOException, ClassNotFoundException {
ObjectInputStream in = new ObjectInputStream( new FileInputStream( file ) );
Serializable o = (Serializable)in.readObject();
in.close();
return o;
} // load
/**
* The method makes a deep clone of the serializable object o by
* sending it through piped streams.
**/
public static Serializable deepclone( final Serializable o )
throws IOException, ClassNotFoundException {
final PipedOutputStream pipeout = new PipedOutputStream();
PipedInputStream pipein = new PipedInputStream( pipeout );
Thread writer = new Thread() {
public void run() {
ObjectOutputStream out = null;
try {
out = new ObjectOutputStream( pipeout );
out.writeObject( o );
} // try
catch( IOException e ) {
} // catch
finally {
try {
out.close();
} // try
catch( Exception e ) {
} // catch
} // finally
} // run
};
writer.start();
ObjectInputStream in = new ObjectInputStream( pipein );
Serializable a = (Serializable)in.readObject();
in.close();
return a;
} // deepclone
/**
*
**/
public static File loadFile() {
final String ext = "ser";
JFileChooser fileChooser = new JFileChooser( new File( System.getProperty( "user.dir" ) ) );
fileChooser.setApproveButtonText( "Load" );
fileChooser.setFileFilter( new javax.swing.filechooser.FileFilter () {
public boolean accept( File file ) {
String fileName = file.getName();
if ( fileName.endsWith( "." + ext ) ) return true;
else return false;
} // accept
public String getDescription() {
return "Serialized. (*.ser)";
} // getDescription
});
int result = fileChooser.showOpenDialog( null );
if ( result == JFileChooser.APPROVE_OPTION ) {
return fileChooser.getSelectedFile();
} // if
else {
return null;
} // else
} // loadFile
/**
*
**/
public static File saveFile() {
final String ext = "ser";
JFileChooser fileChooser = new JFileChooser( new File( System.getProperty( "user.dir" ) ) );
fileChooser.setApproveButtonText( "Save" );
fileChooser.setFileFilter( new javax.swing.filechooser.FileFilter () {
public boolean accept( File file ) {
String fileName = file.getName();
if ( fileName.endsWith( "." + ext ) ) return true;
else return false;
} // accept
public String getDescription() {
return "Serialized. (*.ser)";
} // getDescription
});
int result = fileChooser.showSaveDialog( null );
if ( result == JFileChooser.APPROVE_OPTION ) {
return fileChooser.getSelectedFile();
} // if
else {
return null;
} // else
} // saveFile
} // Serialization
