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                         String osName = System.getProperty("os.name").toLowerCase();
  40                         boolean isMacOsx = osName.indexOf("mac os") >= 0
  41                          || osName.indexOf("darwin") >= 0;
  42                         if (isMacOsx) {
  43                                 // for Mac Osx just use "open" command
  44                                 _browserCommand = new String[] {"open", null};
  45                         }
  46                         else {
  47                                 // assume it's not linux or mac, so try windows method using "start" command
  48                                 _browserCommand = new String[] {"cmd.exe", "/C", "start", "\"\"", null};
  49                                 _urlNeedsQuotes = true;
  50                         }
  51                 }
  52                 _initialised = true;
  53         }
  54
  55
  56         /**
  57          * Check if the specified command exists on the system
  58          * @param inCommand command to check
  59          * @return true if the command exists
  60          */
  61         private static boolean commandExists(String inCommand)
  62         {
  63                 try
  64                 {
  65                         String[] commands = {"which", inCommand};
  66                         if (Runtime.getRuntime().exec(commands).waitFor() == 0)
  67                         {
  68                                 return true;
  69                         }
  70                 }
  71                 catch (Exception e) {} // failed
  72                 return false;
  73         }
  74
  75
  76         /**
  77          * Launch a browser window to show the given url
  78          * @param inUrl url to show
  79          */
  80         public static void launchBrowser(String inUrl)
  81         {
  82                 if (!_initialised) {init();}
  83                 if (_browserCommand == null) {
  84                         JOptionPane.showMessageDialog(null, "Cannot show url: " + inUrl);
  85                 }
  86                 else
  87                 {
  88                         try
  89                         {
  90                                 // enclose url in quotes if necessary
  91                                 String url = inUrl;
  92                                 if (_urlNeedsQuotes) {url = "\"" + url + "\"";}
  93                                 // Fill in url in last element of coommand array
  94                                 _browserCommand[_browserCommand.length - 1] = url;
  95                                 // execute command to launch browser
  96                                 Runtime.getRuntime().exec(_browserCommand);
  97                         }
  98                         catch (Exception e) {
  99                                 JOptionPane.showMessageDialog(null, "Failed to show url: " + inUrl);
 100                         }
 101                 }
 102         }
 103 }