Base Editor

/**
 * This file is a part of Examples
 * (c) 2013 TymoonNET/NexT http://tymoon.eu (shinmera@tymoon.eu)
 * Author: Nicolas Hafner <shinmera@tymoon.eu>
 **/

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

public class BaseEditor extends JFrame implements ActionListener{

    private JTextArea text;
    private JMenuItem mi_save, mi_saveAs, mi_load, mi_quit;
    private File currentDocument;

    public static void main(String[] args){new BaseEditor();}

    public BaseEditor(){
        super();
        setTitle("Basic Editor");
        setSize(300,500);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setupContents();

        pack();
        setVisible(true);
    }

    private void setupContents(){
        text = new JTextArea();
        JScrollPane scroll = new JScrollPane(text);
        scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        this.add(scroll);

        setupMenu();
    }

    private void setupMenu(){
        JMenuBar bar = new JMenuBar();

        JMenu m_file = new JMenu("File");
        m_file.setMnemonic(KeyEvent.VK_F);

        mi_save = new JMenuItem("Save");
        mi_save.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, ActionEvent.CTRL_MASK));
        mi_save.addActionListener(this);
        mi_saveAs = new JMenuItem("Save As..");
        mi_saveAs.addActionListener(this);
        mi_load = new JMenuItem("Load..");
        mi_load.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_L, ActionEvent.CTRL_MASK));
        mi_load.addActionListener(this);
        mi_quit = new JMenuItem("Quit");
        mi_quit.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, ActionEvent.CTRL_MASK));
        mi_quit.addActionListener(this);

        m_file.add(mi_save);
        m_file.add(mi_saveAs);
        m_file.add(mi_load);
        m_file.addSeparator();
        m_file.add(mi_quit);

        bar.add(m_file);

        setJMenuBar(bar);
    }

    public void actionPerformed(ActionEvent ev){
        if(ev.getSource() == mi_save)        actionSave();
        else if(ev.getSource() == mi_saveAs) actionSaveAs();
        else if(ev.getSource() == mi_load)   actionLoad();
        else if(ev.getSource() == mi_quit)   actionQuit();
    }

    private void actionSave(){
        if(currentDocument == null){
            actionSaveAs();
        }else{
            if(saveStringToFile(text.getText(), currentDocument)){
                setTitle("Base Editor - "+currentDocument);
            }else{
                JOptionPane.showMessageDialog(null, "Failed to save document to "+currentDocument, "Failed to Save!", JOptionPane.ERROR_MESSAGE);
            }
        }
    }

    private void actionSaveAs(){
        JFileChooser chooser = new JFileChooser();
        if(chooser.showSaveDialog(this) == JFileChooser.APPROVE_OPTION){
            currentDocument = chooser.getSelectedFile();
            actionSave();
        }
    }

    private void actionLoad(){
        JFileChooser chooser = new JFileChooser();
        if(chooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION){
            currentDocument = chooser.getSelectedFile();
            text.setText(loadFileToString(currentDocument));
            setTitle("Base Editor - "+currentDocument);
        }
    }

    private void actionQuit(){
        if(JOptionPane.showConfirmDialog(this, "Really quit?", "Quit", JOptionPane.YES_NO_OPTION) == JOptionPane.YES_OPTION)
            System.exit(0);
    }

    //From NexT.util.Toolkit
    public static boolean saveStringToFile(String s,File f){
        try{
            f.createNewFile();
            PrintWriter pw = new PrintWriter(new OutputStreamWriter(new FileOutputStream(f),"UTF-8"));
            pw.print(s);
            pw.flush();
            pw.close();
        }catch(IOException ex){
            return false;
        }
        return true;
    }

    public static String loadFileToString(File f){
        StringBuilder s = new StringBuilder();
        try{
            BufferedReader in = new BufferedReader(new FileReader(f));
            String read = "";
            while ((read = in.readLine()) != null)s.append(read+"\n");
            in.close();
        }catch(IOException e){
            return "";
        }
        return s.toString();
    }
}