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/**
* @version 1.00 1999-07-17
* @author Cay Horstmann
*/
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
public class ProgressMonitorInputStreamTest {
public static void main(String[] args)
{ JFrame frame = new TextFrame();
frame.show();
}
}
class TextFrame extends JFrame
implements ActionListener
{ public TextFrame()
{ setTitle("ProgressMonitorInputStreamTest");
setSize(300, 200);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
} );
Container contentPane = getContentPane();
// this text area contains line counts and error messages
textArea = new JTextArea();
contentPane.add(new JScrollPane(textArea), "Center");
// set up menu
JMenuBar menuBar = new JMenuBar();
setJMenuBar(menuBar);
JMenu fileMenu = new JMenu("File");
menuBar.add(fileMenu);
openItem = new JMenuItem("Open");
openItem.addActionListener(this);
fileMenu.add(openItem);
exitItem = new JMenuItem("Exit");
exitItem.addActionListener(this);
fileMenu.add(exitItem);
}
public void actionPerformed(ActionEvent evt)
{ Object source = evt.getSource();
if (source == openItem)
{ // have user select file
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new File("."));
chooser.setFileFilter(
new javax.swing.filechooser.FileFilter()
{ public boolean accept(File f)
{ String fname = f.getName().toLowerCase();
return fname.endsWith(".txt")
|| f.isDirectory();
}
public String getDescription()
{ return "Text Files"; }
});
int r = chooser.showOpenDialog(this);
if (r == JFileChooser.APPROVE_OPTION)
readFile(chooser.getSelectedFile());
}
else if (source == exitItem)
System.exit(0);
}
public void readFile(final File f)
{ /* important: the monitored activity must be in a new
thread. We define a thread class on the fly; the thread
action is in the run method
*/
Thread readThread = new Thread()
{ public void run()
{ try
{ // set up stream and reader filter sequence
FileInputStream fileIn = new FileInputStream(f);
ProgressMonitorInputStream progressIn
= new ProgressMonitorInputStream(TextFrame.this,
"Reading " + f.getName(), fileIn);
InputStreamReader inReader
= new InputStreamReader(progressIn);
BufferedReader in = new BufferedReader(inReader);
// read file and count lines
int count = 0;
String line;
while ((line = in.readLine()) != null)
count++;
textArea.append(f + ": " + count + " lines\n");
fileIn.close();
}
catch(IOException e)
{ textArea.append("Error " + e + "\n");
}
}
};
readThread.start();
}
private JTextArea textArea;
private JMenuItem openItem;
private JMenuItem exitItem;
}
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