// can I call my Delete from another Java class?
// (not an applet --- they are normally not permitted
// to delete files, etc.!)
//
// last modified: 10-27-00

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

public class UseDelete
{
        public static void main(String args[])
        {
                UseDeleteFrame thisFrame = new UseDeleteFrame();

		thisFrame.setSize(600, 400);
        
		thisFrame.setTitle("Using Our Delete Class");
		thisFrame.show();
        }
}

class UseDeleteFrame extends JFrame implements ActionListener
{	
	JLabel			title, fileToDeleteLabel;
	JTextArea		filesList;
	JScrollPane		filesListPane;
	JTextField 		fileToDeleteField;

	String			currentDirectory;
	File			currDirFile; 

	public UseDeleteFrame()
        {
		Container	myContentPane;

		myContentPane = getContentPane();
		myContentPane.setLayout(new FlowLayout());
                
		// gracefully handle a window closing event                      
                addWindowListener(new WindowAdapter()
                        {
                                public void windowClosing(WindowEvent e)
                                {
					System.exit(0);
                                }
                        });

		// this text area will hold names of files in current
		// directory 
		filesList = new JTextArea(10, 20);
		// if I put this JTextArea into a JScrollPane
		// in this way, then
		// the scroll pane will add scroll bars when
		// needed...!
		filesListPane = new JScrollPane(filesList);
		myContentPane.add(filesListPane);

		// here's how you can get the name of
		// the current working directory!
		currentDirectory = System.getProperty("user.dir");
		System.out.println("currentDirectory: " + currentDirectory);

		// get File object for current directory
		currDirFile = new File(currentDirectory);

		// this local method gets the files in currDirFile and
		// displays them in a JTextArea one
		// file name per line
		fillFilesList(currDirFile, filesList);
				
		fileToDeleteLabel = new JLabel("type file to delete: ");				
		myContentPane.add(fileToDeleteLabel);

		fileToDeleteField = new JTextField(20);
		fileToDeleteField.addActionListener(this);
		myContentPane.add(fileToDeleteField);
        }

	//-----
	// display the names of files in the directory corresponding
	// to currDir in the text area currFilesList
	//-----
	private void fillFilesList(File currDir, JTextArea currFilesList)
	{
		String		fileNamesToPrint;
		String[] 	filesInCurrDir;

		// what are the names of the files in
		// the current directory, at this point?
		filesInCurrDir = currDir.list(); 
		
		// put each in a string, each followed by a
		// newline character
		fileNamesToPrint = "";
		for (int i = 0; i < filesInCurrDir.length; i++)
		{
			fileNamesToPrint += filesInCurrDir[i] + "\n";
		}

		// make that the parameter text area's contents
		currFilesList.setText(fileNamesToPrint);	
	}
	
	public void actionPerformed(ActionEvent e)
	{
		String  fileNameToDelete;

		fileNameToDelete = fileToDeleteField.getText();

		// can I call my Delete.java method delete()?
		// (I think it is because it is static that it can 
		// be called this way)
		//
		// note that, since it CAN throw an exception I
		// need to call it in a try-catch block!
		try
		{
			Delete.delete(fileNameToDelete);

			// deleted file should now be gone from
			// text area filesList
			fillFilesList(currDirFile, filesList);			
		}
		catch (IllegalArgumentException exc)
		{
			System.out.println(exc.getMessage());
		}
		
		// whether delete succeeds or fails, I think I
		// should clear the input textfield...
		fileToDeleteField.setText("");
	}
}