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

public class Muistio {
	public static void main(String[] args) {
		Lomake Sovellus = new Lomake("Muistio");	
	}
}

class Lomake extends Frame implements ActionListener, WindowListener {

	TextArea alue;
	TextField tiedosto;
	String leikepoyta;
	Button uusi, avaa, tallenna, leikkaa, kopioi, liita;

	Lomake(String otsikko) {	

		super(otsikko);	 
		setSize(400,300);	
		setLayout(new FlowLayout());

		add(uusi = new Button("Uusi"));
		add(avaa = new Button("Avaa"));
		add(tallenna = new Button("Tallenna"));
		add(leikkaa = new Button("Leikkaa"));
		add(kopioi = new Button("Kopioi"));
		add(liita = new Button("Liitä"));
		add(tiedosto = new TextField(40));
		add(alue = new TextArea(10,40));

		uusi.addActionListener(this);   
		avaa.addActionListener(this);   	
		leikkaa.addActionListener(this);   	
		kopioi.addActionListener(this);   	
		liita.addActionListener(this);   	
	    tallenna.addActionListener(this);   	
		addWindowListener(this);
		setVisible(true);
	}

	public void windowClosing(WindowEvent e) { System.exit(0); }
	public void windowClosed(WindowEvent e)  {}
	public void windowDeiconified(WindowEvent e)  {}
	public void windowIconified(WindowEvent e)  {}
	public void windowActivated(WindowEvent e)  {}
	public void windowDeactivated(WindowEvent e)  {}
	public void windowOpened(WindowEvent e)  {}
	
	public void actionPerformed(ActionEvent e) {
     	
	   	if (e.getActionCommand().equals("Uusi")) {
	   		alue.selectAll();	
			alue.replaceText("",alue.getSelectionStart(),alue.getSelectionEnd());
		}
		if (e.getActionCommand().equals("Leikkaa")) {
	   		leikepoyta = alue.getSelectedText();
	   		//tiedosto.setText(leikepoyta);
	   		alue.replaceText("", alue.getSelectionStart(), alue.getSelectionEnd());
		}
		if (e.getActionCommand().equals("Kopioi")) {
	   		leikepoyta = alue.getSelectedText();
	   		//tiedosto.setText(leikepoyta);
		}
		if (e.getActionCommand().equals("Liitä")) {
	   		alue.replaceText(leikepoyta, alue.getSelectionStart(), alue.getSelectionEnd());
		}
		if (e.getActionCommand().equals("Avaa")) {
	   		FileReader filer = null;
	   		try {
	   			filer = new FileReader(tiedosto.getText());
	   		} catch ( IOException ex ) {
	   			tiedosto.setText("Virhe");
	   		}
	   		BufferedReader buffr = new BufferedReader(filer);
	   		try{
	   			String rivi = null;
	   			do {
	   				rivi = buffr.readLine();
	   				alue.appendText(rivi);
	   				alue.appendText("\n");
	   			} while ( rivi != null);
	   			buffr.close();
	   		} catch ( IOException ex ) {
	   			tiedosto.setText("Virhe");
	   		}
		}
		if (e.getActionCommand().equals("Tallenna")) {
	   		FileWriter filew = null;
	   		try {
	   			filew = new FileWriter(tiedosto.getText());
	   		} catch ( IOException ex ) {
	   			tiedosto.setText("Virhe");
	   		}
	   		BufferedWriter buffw = new BufferedWriter(filew);
	   		try {
	   			buffw.write(alue.getText());
	   			buffw.close();
	   		} catch ( IOException ex ) {
	   			tiedosto.setText("Virhe");
	   		}
		}
	}
}