/* Examples:
 *     BrowserControl.displayURL("http://www.javaworld.com")
 *     BrowserControl.displayURL("file://c:\\docs\\index.html")
 *     BrowserContorl.displayURL("file:///user/joe/index.html");
 *
 * Note - you must include the url type -- either "http://" or "file://".
 */

package NormsTools;

import java.io.*;
import java.util.*;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;

//import com.apple.mrj.MRJFileUtils;     // For Mac


public class BrowserControl {
   // ---------- Define constants: 
   public static final String FileProtocol = "file://";

   // Used to identify the windows platform.
   private static final String WIN_ID = "Windows";
   // The default system browser under windows.
   private static final String WIN_PATH = "rundll32";
   // The flag to display a url.
   private static final String WIN_FLAG = "url.dll,FileProtocolHandler";
   //  For NT ???    "cmd /c Notepad.exe D:\\temp\\test.txt"

   // Id mac
   private static final String Mac_ID = "Mac OS";

   // The default browser under unix.
   private static final String UNIX_PATH = "netscape";
   // The flag to display a url.
   private static final String UNIX_FLAG = "-remote openURL";

   final static boolean debug = false; //true;        // For testing
   
   /**
    * Display a file in the system browser.If you want to display a
    * file, you must include the absolute path name.
    *
    * @param url the file's url (the url must start with either "http://" or
    *             "file://").
    */
   public static void displayURL(String url){
      boolean windows = isPlatform(WIN_ID);
      boolean mac = isPlatform(Mac_ID);
      String cmd = null;
      try{
         if (windows){
            // cmd = 'rundll32 url.dll,FileProtocolHandler http://...'
            cmd = WIN_PATH + " " + WIN_FLAG + " " + url;
            if(debug)
               System.out.println("cmd=" + cmd);
            Process p = Runtime.getRuntime().exec(cmd);

         }else if(mac) {
            System.out.println("On Mac, trying to open " + url);
//            MRJFileUtils.openURL(url);
            // Following copied from BrowserLaunch.java by:
// * @author Eric Albert (<a href="mailto:ejalbert@cs.stanford.edu">ejalbert@cs.stanford.edu</a>)
// * @version 1.4b1 (Released June 20, 2001)

            try {
      			Class mrjFileUtilsClass = Class.forName("com.apple.mrj.MRJFileUtils");
   			   Method openURL = mrjFileUtilsClass.getDeclaredMethod("openURL",
                                                   new Class[] { String.class });
					openURL.invoke(null, new Object[] { url });
				} catch (InvocationTargetException ite) {
					throw new IOException("InvocationTargetException while calling openURL: " 
                                       + ite.getMessage());
				} catch (IllegalAccessException iae) {
					throw new IOException("IllegalAccessException while calling openURL: " 
                                 + iae.getMessage());
            }catch(ClassNotFoundException cnfx) {
               System.err.println("Class.forName error " + cnfx);
            }catch(NoSuchMethodException nsmx) {
               System.err.println("Method.getDeclaredMethod error " + nsmx);
            }

         }else{
            // Under Unix, Netscape has to be running for the "-remote"
            // command to work.So, we try sending the command and
            // check for an exit value.If the exit command is 0,
            // it worked, otherwise we need to start the browser.
            // cmd = 'netscape -remote openURL(http://www.javaworld.com)'
            cmd = UNIX_PATH + " " + UNIX_FLAG + "(" + url + ")";
            Process p = Runtime.getRuntime().exec(cmd);
            try{
               // wait for exit code -- if it's 0, command worked,
               // otherwise we need to start the browser up.
               int exitCode = p.waitFor();
               if (exitCode != 0){
                  // Command failed, start up the browser
                  // cmd = 'netscape http://www.javaworld.com'
                  cmd = UNIX_PATH + " "+ url;
                  p = Runtime.getRuntime().exec(cmd);
               }
            }catch(InterruptedException x){
               System.err.println("Error bringing up browser, cmd='" +  cmd + "'");
               System.err.println("Caught: " + x);
            }
         } // end non Windows code
         //cmd= rundll32 url.dll,FileProtocolHandler file://D:/www/index.html
//         System.out.println("cmd= " + cmd);
      }catch(IOException x){
         // couldn't exec browser
         System.err.println("Could not invoke browser, command=" + cmd);
         System.err.println("Caught: " + x);
      }
   } // end displayURL

   /**
    * Try to determine whether this application is running under Windows
    * or some other platform by examing the "os.name" property.
    *
    * @return true if this application is running under a Windows OS
    */
   public static boolean isPlatform(String id){
      String os = System.getProperty("os.name");
      if ( os != null && os.startsWith(id))
         return true;
      else
         return false;
   } // end
   /** ---------------------------------------
    * Simple example.   Comment out when done testing
   */
   public static void main(String[] args) {
//      displayURL("http://www.javaworld.com");
//      displayURL("file://D:/www/index.html");
      displayURL("http://127.0.0.1:8080");
      System.exit(0);
   } // end main() */
} // end class
/*
Running: java NormsTools.BrowserControl  -D

cmd=rundll32 url.dll,FileProtocolHandler http://127.0.0.1:8080
>>> This starts IE with error msg: Problem with shortcut.  Unable to open http://127.0.0.1:8080  ???

0 error(s)
*/