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package tim.prune.function.browser;
import java.awt.Desktop;
import java.io.IOException;
import java.net.URI;
import javax.swing.JOptionPane;
/**
* Class to launch a browser window to show an external map
* Some code and ideas taken from BareBonesBrowserLaunch at centerkey.com
*/
public abstract class BrowserLauncher
{
private static boolean _initialised = false;
private static String[] _browserCommand = null;
private static boolean _urlNeedsQuotes = false;
/**
* Init method to set up browser
*/
private static synchronized void init()
{
_browserCommand = null;
// First check if "which" command is available
if (commandExists("which"))
{
// which exists, so try browsers in turn
String[] browsersToTry = {"firefox", "iceweasel", "konqueror", "opera", "epiphany",
"mozilla", "chromium", "midori", "safari", "lynx"};
String browserFound = null;
for (String browser : browsersToTry)
{
if (commandExists(browser))
{
browserFound = browser;
break;
}
}
if (browserFound != null) {
_browserCommand = new String[] {browserFound, null};
}
}
if (_browserCommand == null)
{
// no which command (or none of the browsers found), so check if os name looks like a mac
String osName = System.getProperty("os.name").toLowerCase();
boolean isMacOsx = osName.contains("mac os") || osName.contains("darwin");
if (isMacOsx) {
// for Mac Osx just use "open" command
_browserCommand = new String[] {"open", null};
}
else {
// assume it's not linux or mac, so try windows method using "start" command
_browserCommand = new String[] {"cmd.exe", "/C", "start", "\"\"", null};
_urlNeedsQuotes = true;
}
}
_initialised = true;
}
/**
* Check if the specified command exists on the system
* @param inCommand command to check
* @return true if the command exists
*/
private static boolean commandExists(String inCommand)
{
try
{
String[] commands = {"which", inCommand};
if (Runtime.getRuntime().exec(commands).waitFor() == 0)
{
return true;
}
}
catch (Exception e) {} // failed
return false;
}
/**
* Launch a browser window to show the given url
* @param inUrl url to show
*/
public static void launchBrowser(String inUrl)
{
// First choice is to try the Desktop library if possible
try {
if (inUrl != null) {
Desktop.getDesktop().browse(URI.create(inUrl));
}
return;
}
catch (IOException ioe) {}
// The Desktop call failed, need to try backup methods
if (!_initialised) {
init();
}
if (_browserCommand == null) {
JOptionPane.showMessageDialog(null, "Cannot show url: " + inUrl);
return;
}
try
{
// enclose url in quotes if necessary
final String url = _urlNeedsQuotes ? ("\"" + inUrl + "\"") : inUrl;
// Fill in url in last element of command array
_browserCommand[_browserCommand.length - 1] = url;
// execute command to launch browser
Runtime.getRuntime().exec(_browserCommand);
}
catch (Exception e) {
JOptionPane.showMessageDialog(null, "Failed to show url: " + inUrl);
}
}
}
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