// A program from Chapter 13 of Sams Teach Yourself Java in 24 Hours
// by Rogers Cadenhead, http://www.java24hours.com/

package com.java24hours;
 
import java.io.IOException;
import java.nio.file.*;
import javax.swing.*;
  
public class FreeSpacePanel extends JPanel {
    JLabel spaceLabel = new JLabel("Disk space: ");
    JLabel space = new JLabel();
         
    public FreeSpacePanel() {
        super();
        add(spaceLabel);
        add(space);
        try {
            setValue();
        } catch (IOException ioe) {
            space.setText("Error");
        }
    }
     
    private final void setValue() throws IOException {
        // get the current file storage pool
        Path current = Paths.get("");
        FileStore store = Files.getFileStore(current);
        // find the free storage space
        long totalSpace = store.getTotalSpace();
        long freeSpace = store.getUsableSpace();
        // get this as a percentage (with two digits)
        double percent = (double)freeSpace / (double)totalSpace * 100;
        percent = (int)(percent * 100) / (double)100;
        // set the label's text
        space.setText(freeSpace + " free out of " + totalSpace + " ("
            + percent + "%)");
         
    }
}