tim/prune/function/browser/BrowserLauncher.java

   1 package tim.prune.function.browser;
   2
   3 import java.net.URI;
   4 import javax.swing.JOptionPane;
   5
   6
   7 /**
   8  * Class to launch a browser window to show an external map
   9  * Some code and ideas taken from BareBonesBrowserLaunch at centerkey.com
  10  */
  11 public abstract class BrowserLauncher
  12 {
  13         private static boolean _initialised = false;
  14         private static String[] _browserCommand = null;
  15         private static boolean _urlNeedsQuotes = false;
  16
  17
  18         /**
  19          * Init method to set up browser
  20          */
  21         private static void init()
  22         {
  23                 _browserCommand = null;
  24                 // First check if "which" command is available
  25                 if (commandExists("which"))
  26                 {
  27                         // which exists, so try browsers in turn
  28                         String[] browsersToTry = {"firefox", "iceweasel", "konqueror", "opera", "epiphany",
  29                                 "mozilla", "safari", "google-chrome", "lynx"};
  30                         String browserFound = null;
  31                         for (int i=0; i<browsersToTry.length && browserFound == null; i++)
  32                         {
  33                                 if (commandExists(browsersToTry[i]))
  34                                         browserFound = browsersToTry[i];
  35                         }
  36                         if (browserFound != null) {
  37                                 _browserCommand = new String[] {browserFound, null};
  38                         }
  39                 }
  40
  41                 if (_browserCommand == null)
  42                 {
  43                         // no which command (or none of the browsers found), so check if os name looks like a mac
  44                         String osName = System.getProperty("os.name").toLowerCase();
  45                         boolean isMacOsx = osName.indexOf("mac os") >= 0 || osName.indexOf("darwin") >= 0;
  46                         if (isMacOsx) {
  47                                 // for Mac Osx just use "open" command
  48                                 _browserCommand = new String[] {"open", null};
  49                         }
  50                         else {
  51                                 // assume it's not linux or mac, so try windows method using "start" command
  52                                 _browserCommand = new String[] {"cmd.exe", "/C", "start", "\"\"", null};
  53                                 _urlNeedsQuotes = true;
  54                         }
  55                 }
  56                 _initialised = true;
  57         }
  58
  59
  60         /**
  61          * Check if the specified command exists on the system
  62          * @param inCommand command to check
  63          * @return true if the command exists
  64          */
  65         private static boolean commandExists(String inCommand)
  66         {
  67                 try
  68                 {
  69                         String[] commands = {"which", inCommand};
  70                         if (Runtime.getRuntime().exec(commands).waitFor() == 0)
  71                         {
  72                                 return true;
  73                         }
  74                 }
  75                 catch (Exception e) {} // failed
  76                 return false;
  77         }
  78
  79
  80         /**
  81          * Launch a browser window to show the given url
  82          * @param inUrl url to show
  83          */
  84         public static void launchBrowser(String inUrl)
  85         {
  86                 // First choice is to try the Desktop library from java 6, if available
  87                 try {
  88                         Class<?> d = Class.forName("java.awt.Desktop");
  89                         d.getDeclaredMethod("browse", new Class[] {URI.class}).invoke(
  90                                 d.getDeclaredMethod("getDesktop").invoke(null), new Object[] {URI.create(inUrl)});
  91                         //above code mimics: Desktop.getDesktop().browse(URI.create(inUrl));
  92                 }
  93                 catch (Exception ignore)
  94                 {
  95                         // The Desktop call failed, need to try backup methods
  96                         if (!_initialised) {init();}
  97                         if (_browserCommand == null) {
  98                                 JOptionPane.showMessageDialog(null, "Cannot show url: " + inUrl);
  99                         }
 100                         else
 101                         {
 102                                 try
 103                                 {
 104                                         // enclose url in quotes if necessary
 105                                         String url = inUrl;
 106                                         if (_urlNeedsQuotes) {url = "\"" + url + "\"";}
 107                                         // Fill in url in last element of command array
 108                                         _browserCommand[_browserCommand.length - 1] = url;
 109                                         // execute command to launch browser
 110                                         Runtime.getRuntime().exec(_browserCommand);
 111                                 }
 112                                 catch (Exception e) {
 113                                         JOptionPane.showMessageDialog(null, "Failed to show url: " + inUrl);
 114                                 }
 115                         }
 116                 }
 117         }
 118 }