package Primos;

import java.util.List;
import java.util.Random;
import java.util.concurrent.ExecutionException;

import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JTextArea;
import javax.swing.SwingWorker;

public class PrimeCalculator extends SwingWorker<Integer, Integer> {
    private final Random generator = new Random();
    private final JTextArea intermediateJTextArea;
    private final JButton getPrimesJButton;
    private final JButton cancelJButton;
    private final JLabel statusJLabel;
    private final boolean primes[];
    private boolean stopped = false;

    public PrimeCalculator(int max, JTextArea intermediate, JLabel status, JButton getPrimes, JButton cancel) {
        intermediateJTextArea = intermediate;
        statusJLabel = status;
        getPrimesJButton = getPrimes;
        cancelJButton = cancel;
        primes = new boolean[max];

        for (int i = 0; i < max; i++)
            primes[i] = true;
    }

    public Integer doInBackground() {
        int count = 0;
        for (int i = 2; i < primes.length; i++) {
            if (stopped)
                return count;
            else {
                setProgress(100 * (i + 1) / primes.length);

                try {
                    Thread.currentThread().sleep(generator.nextInt(5));
                } catch (InterruptedException ex) {
                    statusJLabel.setText("Thread Interrompida");
                    return count;
                }

                if (primes[i]) {
                    publish(i);
                    ++count;

                    for (int j = i + i; j < primes.length; j += i)
                        primes[j] = false;
                }
            }

        }

        return count;
    }

    protected void process(List<Integer> publishedVals) {
        for (int i = 0; i < publishedVals.size(); i++)
            intermediateJTextArea.append(publishedVals.get(i) + "\n");
    }

    protected void done() {
        getPrimesJButton.setEnabled(true);
        cancelJButton.setEnabled(false);
        int numPrimes;

        try {
            numPrimes = get();
        } catch (InterruptedException ex) {
            statusJLabel.setText("Interrupted while waiting for results.");
            return;
        } catch (ExecutionException ex) {
            statusJLabel.setText("Error performing computation.");
            return;
        }

        statusJLabel.setText("Encontrados " + numPrimes + " primos.");
    }

    public void stopCalculation() {
        stopped = true;
    }
}
/////////////////////////////////////////////////////////////////////////////////

package Primos;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.ScrollPaneConstants;

public class FindPrimes extends JFrame {
    private final JTextField highestPrimeJTextField = new JTextField();
    private final JButton getPrimesJButton = new JButton("Executar");
    private final JTextArea displayPrimesJTextArea = new JTextArea();
    private final JButton cancelJButton = new JButton("Cancelar");
    private final JProgressBar progressJProgressBar = new JProgressBar();
    private final JLabel statusJLabel = new JLabel();
    private PrimeCalculator calculator;

    public FindPrimes() {
        super("Números Primos");
        setLayout(new BorderLayout());

        JPanel northJPanel = new JPanel();
        northJPanel.add(new JLabel("Primos anteriores a: "));
        highestPrimeJTextField.setColumns(5);
        northJPanel.add(highestPrimeJTextField);
        getPrimesJButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                progressJProgressBar.setValue(0);
                displayPrimesJTextArea.setText("");
                statusJLabel.setText("");

                int number;
                try {

                    number = Integer.parseInt(highestPrimeJTextField.getText());
                } catch (NumberFormatException ex) {
                    statusJLabel.setText("Use Inteiros!");
                    return;
                }

                calculator = new PrimeCalculator(number, displayPrimesJTextArea, statusJLabel, getPrimesJButton, cancelJButton);

                calculator.addPropertyChangeListener(new PropertyChangeListener() {
                    public void propertyChange(PropertyChangeEvent e) {
                        if (e.getPropertyName().equals("Progresso")) {
                            int newValue = (Integer) e.getNewValue();
                            progressJProgressBar.setValue(newValue);
                        }
                    }
                });

                getPrimesJButton.setEnabled(false);
                cancelJButton.setEnabled(true);

                calculator.execute();
            }
        });
        northJPanel.add(getPrimesJButton);

        displayPrimesJTextArea.setEditable(false);
        add(new JScrollPane(displayPrimesJTextArea, ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER));

        JPanel southJPanel = new JPanel(new GridLayout(1, 3, 10, 10));
        cancelJButton.setEnabled(false);
        cancelJButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                calculator.stopCalculation();
            }
        });
        southJPanel.add(cancelJButton);
        progressJProgressBar.setStringPainted(true);
        southJPanel.add(progressJProgressBar);
        southJPanel.add(statusJLabel);

        add(northJPanel, BorderLayout.NORTH);
        add(southJPanel, BorderLayout.SOUTH);
        setSize(350, 300);
        setVisible(true);
    }

    public static void main(String[] args) {
        FindPrimes application = new FindPrimes();
        application.setDefaultCloseOperation(EXIT_ON_CLOSE);
    }
}