org.rapidcontext.app.ui.AppUtils.java Source code

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Here is the source code for org.rapidcontext.app.ui.AppUtils.java

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/*
 * RapidContext <http://www.rapidcontext.com/>
 * Copyright (c) 2007-2010 Per Cederberg. All rights reserved.
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the BSD license.
 *
 * 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 RapidContext LICENSE for more details.
 */

package org.rapidcontext.app.ui;

import org.apache.commons.lang.SystemUtils;

/**
 * Provides a few utilities for UI applications.
 *
 * @author   Per Cederberg
 * @version  1.0
 */
public class AppUtils {

    /**
     * The default array of Linux browsers.
     */
    private static final String[] BROWSERS = { "google-chrome", "firefox", "mozilla", "opera", "konqueror" };

    /**
     * Checks if a command is available (in a Unix environment).
     *
     * @param command        the command-line application name
     *
     * @return true if the application is available, or
     *         false otherwise
     */
    public static boolean hasCommand(String command) {
        try {
            Process proc = Runtime.getRuntime().exec("which " + command);
            return proc.getInputStream().read() != -1;
        } catch (Exception ignore) {
            return false;
        }
    }

    /**
     * Opens the specified URL in the user's default browser.
     *
     * @param url            the URL to open
     *
     * @throws Exception if the URL failed to open or if no browser was found
     */
    public static void openURL(String url) throws Exception {
        if (SystemUtils.IS_OS_MAC_OSX) {
            Runtime.getRuntime().exec("open " + url);
        } else if (SystemUtils.IS_OS_WINDOWS) {
            Runtime.getRuntime().exec("cmd.exe /C start " + url);
        } else if (hasCommand("xdg-open")) {
            Runtime.getRuntime().exec("xdg-open " + url);
        } else if (hasCommand("gnome-open")) {
            Runtime.getRuntime().exec("gnome-open " + url);
        } else if (hasCommand("kde-open")) {
            Runtime.getRuntime().exec("kde-open " + url);
        } else {
            for (int i = 0; i < BROWSERS.length; i++) {
                if (hasCommand(BROWSERS[i])) {
                    Runtime.getRuntime().exec(BROWSERS[i] + " " + url);
                    return;
                }
            }
            throw new Exception("No browser found.");
        }
    }
}