driver.java~

designpatterns for aop

package designpatterns.decorator.java;

import java.awt.event.*;
import java.io.*;

import javax.swing.*;

import worker.SwingWorker;


public class Driver extends JPanel {
	private JTextField name = new JTextField("Enter a File name");
	private JButton readButton;
	private JLabel bytesReadLabel = new JLabel("Nothing read");
	private int bytesRead;
	
	public Driver(){
		readButton = buildReadButton();
		
		add(name);
		add(readButton);
		add(bytesReadLabel);
	}
	
	
	
	private JButton buildReadButton() {
		JButton readButton = new JButton("Go!");
		readButton.addActionListener(new ActionListener(){
			public void actionPerformed(java.awt.event.ActionEvent ae){
				readFile();
			}
		});
		return readButton;
	}



	protected void readFile() {
		//SwingWorker necessary so that a time-consuming file-read
		//can happen in its own thread and allow GUI updates to keep
		//happening. This can be automated in AspectJ
		//with the worker-object pattern.
		SwingWorker worker = new SwingWorker(){
			public Object construct(){
				actuallyReadFile();
				return null;
			}
		};
		worker.start();
	}



	private void actuallyReadFile() {
		try {

			InputStream in = createInputStream();
			byte[] b =new byte[1000];
			while (in.read(b) != -1) {
				//do whatever here
				bytesRead+=1000;
			}
			bytesReadLabel.setText("Read " +  (bytesRead/1000) + "k");
			bytesRead = 0;
			in.close();
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}



	private InputStream createInputStream() throws FileNotFoundException {
		FileInputStream stream = new FileInputStream(name.getText());
//		ProgressMonitorInputStream pmStream = new ProgressMonitorInputStream(
//				this, "This is gonna take a while", stream);
		BufferedInputStream buff = new BufferedInputStream(stream);
		return buff;
	}



	public static void main(String[] args)
	{
		JFrame frame = new JFrame("Decorator Example");
		frame.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {System.exit(0);}
		});  
		
		frame.getContentPane().add(new Driver());
		
		frame.pack();
		frame.setVisible(true);
	}
}