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

public class FileSaveDialog extends JFileChooser implements ActionListener {

    WorkSpace workSpace;
    DrawingCanvas canvas;

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

    public void actionPerformed(ActionEvent e) {
	File path = null;
	try {
	    showSaveDialog(null);
	    path = getSelectedFile();
	    FileOutputStream outFile = new FileOutputStream(path);
	    ObjectOutputStream outObj = new ObjectOutputStream(outFile);
	    /*
	     * It appears that there may be some problem with saving with a
	     * shape selected, so we'll toggle it off then back on when
	     * saving.  This is a bit tricky for 102 students, but we won't
	     * hold then too it.
	     */
	    Shape selection = workSpace.getSelection();
	    workSpace.setSelection(null);
	    outObj.writeObject(workSpace);
	    workSpace.setSelection(selection);
	}
	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);
	}
    }

}