/*

 * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 4296930 5033603 7092679

 * @summary Make sure that Java runtime detects the platform time zone

 * correctly. Also make sure that the system time zone detection code

 * detects the "Automatically adjust clock for daylight saving

 * changes" setting correctly on Windows.

 * @run applet/manual=yesno DefaultTimeZoneTest.html

 */

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.text.*;

import java.util.*;

public class DefaultTimeZoneTest extends JApplet implements Runnable {

    static final String FORMAT = "yyyy-MM-dd HH:mm:ss zzzz (XXX)";

    JLabel tzid;

    JLabel label;

    SimpleDateFormat sdf = new SimpleDateFormat(FORMAT);

    JButton button = new JButton("English");

    Thread clock;

    boolean english = false;

    @Override

    public void init() {

        tzid = new JLabel("Time zone ID: " + sdf.getTimeZone().getID(), SwingConstants.CENTER);

        tzid.setAlignmentX(Component.CENTER_ALIGNMENT);

        label = new JLabel(sdf.format(new Date()), SwingConstants.CENTER);

        label.setAlignmentX(Component.CENTER_ALIGNMENT);

        button.addActionListener(new ActionListener() {

                @Override

                @SuppressWarnings("deprecation")

                public void actionPerformed(ActionEvent e) {

                    english = (english == false);

                    Locale loc = english ? Locale.US : Locale.getDefault();

                    sdf = new SimpleDateFormat(FORMAT, loc);

                    button.setLabel(!english ? "English" : "Local");

                }

            });

        button.setAlignmentX(Component.CENTER_ALIGNMENT);

        JPanel panel = new JPanel();

        panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS));

        panel.add(Box.createRigidArea(new Dimension(0, 10)));

        panel.add(tzid);

        panel.add(Box.createRigidArea(new Dimension(0, 5)));

        panel.add(label);

        panel.add(Box.createRigidArea(new Dimension(0, 10)));

        panel.add(button);

        getContentPane().add(panel);

    }

    @Override

    public void start() {

        clock = new Thread(this);

        clock.start();

    }

    @Override

    public void stop() {

        clock = null;

    }

    @Override

    public void run() {

        Thread me = Thread.currentThread();

        while (clock == me) {

            // Reset the default time zone so that

            // TimeZone.getDefault will detect the platform time zone

            TimeZone.setDefault(null);

            System.setProperty("user.timezone", "");

            TimeZone tz = TimeZone.getDefault();

            sdf.setTimeZone(tz);

            tzid.setText("Time zone ID: " + tz.getID());

            label.setText(sdf.format(new Date()));

            repaint();

            try {

                Thread.sleep(1000);

            } catch (InterruptedException e) {

            }

        }

    }

}