TrayIconFactory.java

/*
 * Syncany, www.syncany.org
 * Copyright (C) 2011-2013 Philipp C. Heckel <philipp.heckel@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.syncany.gui.tray;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import org.eclipse.swt.widgets.Shell;
import org.syncany.util.EnvironmentUtil;

/**
 * The tray icon factory creates a tray icon given the current
 * {@link Shell} object.
 *
 * @author Philipp C. Heckel <philipp.heckel@gmail.com>
 * @author Vincent Wiencek <vwiencek@gmail.com>
 * @author Christian Roth <christian.roth@port17.de>
 */
public class TrayIconFactory {
	/**
	 * Detects the current operating system and desktop environment
	 * and creates a new tray icon -- either a {@link DefaultTrayIcon}
	 * or {@link AppIndicatorTrayIcon}.
	 *
	 * <p>This method calls {@link #createTrayIcon(Shell, TrayIconType, TrayIconTheme) createTrayIcon()}
	 * with the default parameters.
	 */
	public static TrayIcon createTrayIcon(Shell shell) {
		return TrayIconFactory.createTrayIcon(shell, null, null);
	}

	/**
	 * Detects the current operating system and desktop environment
	 * and creates a new tray icon -- either a {@link DefaultTrayIcon}, a{@link OSXTrayIcon}
	 * or {@link AppIndicatorTrayIcon}, depending on the {@link TrayIconType}.
	 * Also sets the theme.
	 */
	public static TrayIcon createTrayIcon(Shell shell, TrayIconType forceType, TrayIconTheme forceTheme) {
		if (forceType == null || forceType == TrayIconType.AUTO) {
			forceType = detectTypeFromOS();
		}

		if (forceTheme == null || forceTheme == TrayIconTheme.AUTO) {
			forceTheme = detectThemeFromOS();
		}

		switch (forceType) {
			case APPINDICATOR:
				return new AppIndicatorTrayIcon(shell, forceTheme);

			case OSX_NOTIFICATION_CENTER:
				return new OSXTrayIcon(shell, forceTheme);

			case DEFAULT:
			default:
				return new DefaultTrayIcon(shell, forceTheme);
		}
	}

	public static TrayIconType detectTypeFromOS() {
		if (EnvironmentUtil.isUnixLikeOperatingSystem() && isUnity()) {
			return TrayIconType.APPINDICATOR;
		}
		else if (EnvironmentUtil.isMacOSX()) {
			return TrayIconType.OSX_NOTIFICATION_CENTER;
		}
		else {
			return TrayIconType.DEFAULT;
		}
	}

	public static TrayIconTheme detectThemeFromOS() {
		if (EnvironmentUtil.isMacOSX()) {
			return TrayIconTheme.MONOCHROME;
		}
		else {
			return TrayIconTheme.DEFAULT;
		}
	}

	private static boolean isUnity() {
		ProcessBuilder processBuilder = new ProcessBuilder("/bin/ps", "--no-headers", "-C", "unity-panel-service");

		try {
			Process process = processBuilder.start();
			BufferedReader processInputReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
			String firstLine = processInputReader.readLine();

			boolean isUnity = firstLine != null;

			process.destroy();
			processInputReader.close();

			return isUnity;
		}
		catch (IOException e) {
			throw new RuntimeException("Unable to determine Linux desktop environment.", e);
		}
	}
}