package simple_implimentation;

import java.awt.Dimension;

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

@SuppressWarnings("serial")

public class OctalObserver extends JFrame implements Observer , ActionListener{

private Subject subject;

private JLabel label = new JLabel("State Octal Value : Undefined");

private JPanel labelPanel = new JPanel();

private JPanel buttonPanel = new JPanel();

private JPanel emptyPanel = new JPanel();

private JButton subscribe = new JButton("Subscribe-Me");

private JButton unsubscribe = new JButton("Unsubscribe-Me");

public OctalObserver(Subject subject){

super("Welcome to the Octal Observer!");

this.subject = subject;

this.setLayout(new FlowLayout());

labelPanel.setLayout(new FlowLayout());

buttonPanel.setLayout(new FlowLayout());

labelPanel.add(label);

buttonPanel.add(subscribe);

buttonPanel.add(unsubscribe);

emptyPanel.setPreferredSize(new Dimension(300,150));

subscribe.addActionListener(this);

unsubscribe.addActionListener(this);

this.add(labelPanel);

this.add(emptyPanel);

this.add(buttonPanel);

this.subscribe.setEnabled(true);

this.unsubscribe.setEnabled(false);

this.setSize(300, 300);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setVisible(true);

}

@Override

public void update() {

this.getLabel().setText( "State Octal Value : "

+ Integer.toOctalString( subject.getState() ) );

}

public JLabel getLabel() {

return label;

}

public void setLabel(JLabel label) {

this.label = label;

}

@Override

public void actionPerformed(ActionEvent event) {

if (event.getSource() == subscribe) {

this.subject.subscribe(this);

this.subscribe.setEnabled(false);

this.unsubscribe.setEnabled(true);

}

else if (event.getSource() == unsubscribe) {

this.subject.unsubscribe(this);

this.getLabel().setText( "State Octal Value : Undefined");

this.subscribe.setEnabled(true);

this.unsubscribe.setEnabled(false);

}

}

}