Browser.java

/**
 * class Browser Copyright (C) 1999-2001 Fredrik Ehnbom <fredde@gjt.org>
 * available at
 * <http://www.gjt.org/servlets/JCVSlet/show/gjt/org/gjt/fredde/util/net/Browser.java/HEAD>
 * used under the terms of the GNU public license
 *
 * Launches the default browser of the current OS with the supplied URL.
 *
 * $Id: Browser.java,v 1.1 2007-05-03 09:18:07 irockel Exp $
 */
package com.pironet.tda.utils;

import java.io.IOException;

/** 
 * helper class for launching the default browser
 */
public class Browser { 
    
    /**
     * Starts the default browser for the current platform.
     *
     * @param url The link to point the browser to.
     */
    public static void open(String url) throws InterruptedException, IOException {
        String cmd = null;
        
        if (isWindows()) {
            cmd = ("rundll32 url.dll,FileProtocolHandler " + maybeFixupURLForWindows(url));
            Runtime.getRuntime().exec(cmd);
        } else {
            if(System.getenv("BROWSER") != null) {
                cmd = System.getenv("BROWSER") + " " + url;
            } else {
                cmd = "firefox -remote openURL(" + url + ")";
            }
            Process p = Runtime.getRuntime().exec(cmd);
            int exitcode = p.waitFor();
            if (exitcode != 0) {
                cmd = "firefox " + url; 
                Runtime.getRuntime().exec(cmd);
            }
        }
    }
    
    /**
     * If the default browser is Internet Explorer 5.0 or greater,
     * the URL.DLL program fails if the url ends with .htm or .html .
     * This problem is described by Microsoft at
     * http://support.microsoft.com/support/kb/articles/Q283/2/25.ASP
     * Of course, their suggested workaround is to use the classes from the
     * microsoft Java SDK, but fortunately another workaround does exist.
     * If you alter the url slightly so it no longer ends with ".htm",
     * the URL can launch successfully. The logic here appends a null query
     * string onto the end of the URL if none is already present, or
     * a bogus query parameter if there is already a query string ending in
     * ".htm"
     */
    private static String maybeFixupURLForWindows(String url) {
        // plain filenames (e.g. c:\some_file.html or \\server\filename) do
        // not need fixing.
        if (url == null || url.length() < 2 || url.charAt(0) == '\\' || url.charAt(1) == ':')
            return url;
        String lower_url = url.toLowerCase();
        int i = badEndings.length;
        while (i-- > 0)
            if (lower_url.endsWith(badEndings[i]))
                return fixupURLForWindows(url);
        return url;
    }
    
    static final String[] badEndings = { ".htm", ".html", ".htw", ".mht", ".cdf", ".mhtml", ".stm" };
    
    private static String fixupURLForWindows(String url) {
        if (url.indexOf('?') == -1)
            return url + "?";
        else return url + "&workaroundStupidWindowsBug";
    }
    
    /**
     * Checks if the OS is windows.
     *
     * @return true if it is, false if it's not.
     */
    public static boolean isWindows() {
        if (System.getProperty("os.name").indexOf("Windows") != -1) {
            return true; } else { return false; }
    }
}