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

public class FileOpenDialog extends JFileChooser implements ActionListener {

    WorkSpace workSpace;
    DrawingCanvas canvas;

    public FileOpenDialog (WorkSpace workSpace, DrawingCanvas canvas) {
        this.workSpace = workSpace;
        this.canvas = canvas;
    }

    public void actionPerformed(ActionEvent e) {
        File path = null;
	try {
	    showOpenDialog(null);
	    path = getSelectedFile();
	    FileInputStream inFile = new FileInputStream(path);
	    ObjectInputStream inObj = new ObjectInputStream(inFile);
	    workSpace.setShapes((WorkSpace) inObj.readObject());
	    canvas.repaint();
	}
	catch (NullPointerException npe) {
	    // Just ignore this; it means the user didn't select a file.
	}	
	catch (FileNotFoundException fnfe) {
	    new JOptionPane().
		showMessageDialog(null, "File " + path + " not found.", "",
		    JOptionPane.ERROR_MESSAGE);
	}
	catch (IOException ioe) {
	    new JOptionPane().
		showMessageDialog(null, "I/o exception:" + ioe, "",
		    JOptionPane.ERROR_MESSAGE);
	}
	catch (ClassNotFoundException cnfe) {
	    new JOptionPane().
		showMessageDialog(null, "Class not found:" + cnfe, "",
		    JOptionPane.ERROR_MESSAGE);
	}
    }

}