tim/prune/function/browser/BrowserLauncher.java

   1 package tim.prune.function.browser;
   2
   3 import javax.swing.JOptionPane;
   4
   5
   6 /**
   7  * Class to launch a browser window to show an external map
   8  */
   9 public abstract class BrowserLauncher
  10 {
  11         private static boolean _initialised = false;
  12         private static String[] _browserCommand = null;
  13         private static boolean _urlNeedsQuotes = false;
  14
  15
  16         /**
  17          * Init method to set up browser
  18          */
  19         private static void init()
  20         {
  21                 // First check if "which" command is available
  22                 if (commandExists("which"))
  23                 {
  24                         // which exists, so try browsers in turn
  25                         String[] browsersToTry = {"firefox", "iceweasel", "konqueror", "opera", "epiphany", "mozilla", "safari", "lynx"};
  26                         String browserFound = null;
  27                         for (int i=0; i<browsersToTry.length && browserFound == null; i++)
  28                         {
  29                                 if (commandExists(browsersToTry[i]))
  30                                         browserFound = browsersToTry[i];
  31                         }
  32                         if (browserFound != null) {
  33                                 _browserCommand = new String[] {browserFound, null};
  34                         }
  35                 }
  36                 else
  37                 {
  38                         // no which command, so check if os name looks like a mac
  39                         boolean isMacOsx = System.getProperty("os.name").toLowerCase().indexOf("mac os") >= 0;
  40                         if (isMacOsx) {
  41                                 // for Mac Osx just use "open" command
  42                                 _browserCommand = new String[] {"open", null};
  43                         }
  44                         else {
  45                                 // assume it's not linux or mac, so try windows method using "start" command
  46                                 _browserCommand = new String[] {"cmd.exe", "/C", "start", "\"\"", null};
  47                                 _urlNeedsQuotes = true;
  48                         }
  49                 }
  50                 _initialised = true;
  51         }
  52
  53
  54         /**
  55          * Check if the specified command exists on the system
  56          * @param inCommand command to check
  57          * @return true if the command exists
  58          */
  59         private static boolean commandExists(String inCommand)
  60         {
  61                 try
  62                 {
  63                         String[] commands = {"which", inCommand};
  64                         if (Runtime.getRuntime().exec(commands).waitFor() == 0)
  65                         {
  66                                 return true;
  67                         }
  68                 }
  69                 catch (Exception e) {} // failed
  70                 return false;
  71         }
  72
  73
  74         /**
  75          * Launch a browser window to show the given url
  76          * @param inUrl url to show
  77          */
  78         public static void launchBrowser(String inUrl)
  79         {
  80                 if (!_initialised) {init();}
  81                 if (_browserCommand == null) {
  82                         JOptionPane.showMessageDialog(null, "Cannot show url: " + inUrl);
  83                 }
  84                 else
  85                 {
  86                         try
  87                         {
  88                                 // enclose url in quotes if necessary
  89                                 String url = inUrl;
  90                                 if (_urlNeedsQuotes) {url = "\"" + url + "\"";}
  91                                 // Fill in url in last element of coommand array
  92                                 _browserCommand[_browserCommand.length - 1] = url;
  93                                 // execute command to launch browser
  94                                 Runtime.getRuntime().exec(_browserCommand);
  95                         }
  96                         catch (Exception e) {
  97                                 JOptionPane.showMessageDialog(null, "Failed to show url: " + inUrl);
  98                         }
  99                 }
 100         }
 101 }