tim/prune/browser/BrowserLauncher.java

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