src/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", "chromium", "midori", "safari", "lynx"};
  30                         String browserFound = null;
  31                         for (String browser : browsersToTry)
  32                         {
  33                                 if (commandExists(browser))
  34                                 {
  35                                         browserFound = browser;
  36                                         break;
  37                                 }
  38                         }
  39                         if (browserFound != null) {
  40                                 _browserCommand = new String[] {browserFound, null};
  41                         }
  42                 }
  43
  44                 if (_browserCommand == null)
  45                 {
  46                         // no which command (or none of the browsers found), so check if os name looks like a mac
  47                         String osName = System.getProperty("os.name").toLowerCase();
  48                         boolean isMacOsx = osName.indexOf("mac os") >= 0 || osName.indexOf("darwin") >= 0;
  49                         if (isMacOsx) {
  50                                 // for Mac Osx just use "open" command
  51                                 _browserCommand = new String[] {"open", null};
  52                         }
  53                         else {
  54                                 // assume it's not linux or mac, so try windows method using "start" command
  55                                 _browserCommand = new String[] {"cmd.exe", "/C", "start", "\"\"", null};
  56                                 _urlNeedsQuotes = true;
  57                         }
  58                 }
  59                 _initialised = true;
  60         }
  61
  62
  63         /**
  64          * Check if the specified command exists on the system
  65          * @param inCommand command to check
  66          * @return true if the command exists
  67          */
  68         private static boolean commandExists(String inCommand)
  69         {
  70                 try
  71                 {
  72                         String[] commands = {"which", inCommand};
  73                         if (Runtime.getRuntime().exec(commands).waitFor() == 0)
  74                         {
  75                                 return true;
  76                         }
  77                 }
  78                 catch (Exception e) {} // failed
  79                 return false;
  80         }
  81
  82
  83         /**
  84          * Launch a browser window to show the given url
  85          * @param inUrl url to show
  86          */
  87         public static void launchBrowser(String inUrl)
  88         {
  89                 if (inUrl == null) {return;}
  90                 // First choice is to try the Desktop library from java 6, if available
  91                 try {
  92                         Class<?> d = Class.forName("java.awt.Desktop");
  93                         d.getDeclaredMethod("browse", new Class[] {URI.class}).invoke(
  94                                 d.getDeclaredMethod("getDesktop").invoke(null), new Object[] {URI.create(inUrl)});
  95                         //above code mimics: Desktop.getDesktop().browse(URI.create(inUrl));
  96                 }
  97                 catch (Exception ignore)
  98                 {
  99                         // The Desktop call failed, need to try backup methods
 100                         if (!_initialised) {init();}
 101                         if (_browserCommand == null) {
 102                                 JOptionPane.showMessageDialog(null, "Cannot show url: " + inUrl);
 103                         }
 104                         else
 105                         {
 106                                 try
 107                                 {
 108                                         // enclose url in quotes if necessary
 109                                         String url = inUrl;
 110                                         if (_urlNeedsQuotes) {url = "\"" + url + "\"";}
 111                                         // Fill in url in last element of command array
 112                                         _browserCommand[_browserCommand.length - 1] = url;
 113                                         // execute command to launch browser
 114                                         Runtime.getRuntime().exec(_browserCommand);
 115                                 }
 116                                 catch (Exception e) {
 117                                         JOptionPane.showMessageDialog(null, "Failed to show url: " + inUrl);
 118                                 }
 119                         }
 120                 }
 121         }
 122 }