boolean done = false;            this.finishedScan = false;            while(!this.finishedScan){                if(!done){                  if(Windows.debugWatcher) System.out.println(Windows.createUSB + " Watcher.Constructor() >>> scan started");                  scan();                  done = true;                }            }            if(Windows.debugWatcher) System.out.println(Windows.createUSB + " Watcher.Constructor() >>> after scan! \n");                          if (busses.isEmpty()) throw new IOException(                "There is no Host Controller on the Windows operating system."                 + " You don't have a USB at all!");                      }                  public void run() {                          while(true){                try{                    if(Windows.debugWatcher) System.out.println("\n>>>> Watcher.run() >>> Thread goes now to sleeps for " + POLL_PERIOD +"s \n");                   Thread.sleep (POLL_PERIOD * 1000);                                                          boolean done = false;                    this.finishedScan = false;                    while(!this.finishedScan){                        if(!done){                            if(Windows.debugWatcher) System.out.println("\n>> Watcher.run() >>>   G O I N I G   T O    S C A N    A L L !    Starttime[" + System.currentTimeMillis()   + "] \n");                            scan();                            done = true;                        }                    }                }                 catch (InterruptedException e) {		    // set dir to null to cause a clean exit                }                catch(IOException e){                   e.printStackTrace();                   }            }         }                  private native String getHostControllerName(int number);                  /**          * scan all the busses and all the devices on each bus          */         private void scan() throws IOException{                         synchronized(busses){                 // what busses exists now?                 // look for all existing Host Controller on the Windows OS                 int i = 0;                 String hostControllerDevicePath;                 Vector kids = null;  // Kids contains all current Host Controllers                                   // as long we find a hostcontroller create a new bus                 while((hostControllerDevicePath = Windows.getHostControllerDevicePath(i)) != null){                                       if(kids == null)        //create a Vector for kids as soon we                        kids = new Vector(); // find at least one host controller                                      kids.add(hostControllerDevicePath); //add the hc to the kids                                        // for debugging                   if(Windows.debugWatcher)                        System.out.println(Windows.createUSB + " Watcher.scan() >>> kids[" + i + "].add("+ hostControllerDevicePath + " )");                   i++;                 }                 // so far our kids contains all host controller which are currently                 // available on the windows system                 // now check if something changed since the last scan has being applied                 if(Windows.debugWatcher) System.out.println(Windows.createUSB + " Watcher.scan() >>> check if something changed since the last scan has being applied");                                 Vector seen = new Vector(kids.size());                 for(i = 0; i < kids.size() ; i++) {                     // Windows has not really a bus number for each USB bus                     // therefore we give each bus an abstract number, so that                     // it corresponds to linux impl and the jusb core API                     int busnum = i + 1;                                          //mark the kid we look at as seen                     seen.add((String)kids.get(i));                                          //try to get the bus object from the current busses                     USB bus = (USB) busses.get((String)kids.get(i));                                          //if we didn't get a bus object, it is a new bus                     if(bus == null){                        if(Windows.debugWatcher) System.out.println(Windows.createUSB + " Watcher.scan() >>> NEW <<< found a new bus. Create a new BUS with busnum="+busnum);                        mkBus((String)kids.get(i),busnum);                      }else{                         // check wheter the existing bus has some changes                         // with its attached devices                        if(Windows.debugWatcher) System.out.println(Windows.createUSB + " Watcher.scan() >>> SAME <<< BUS["+busnum+"] already exists. Check if something changed on the BUS[" + busnum + "]");                        bus.setFinishScanBusFalse();                        boolean done = false;                        while(!bus.getFinishScanBus()){                            if(!done){                                if(Windows.debugWatcher) System.out.println(Windows.createUSB + " Watcher.scan() >>> start scanBus BUS["+busnum+"]!");                                bus.scanBus();                                done = true;                            }                         }                     }                   } // end of for                                      // what are the busses that previously existed?                   // if we find some busses that doesn't exist                   // anymore, we have to remove them                                      for(Enumeration e = busses.keys(); e.hasMoreElements(); ){                     Object busname = e.nextElement();                     if(!seen.contains(busname)){                        //this bus is not attached anymore, remove it                        if(Windows.debugWatcher) System.out.println(Windows.createUSB + " Watcher.scan() >>> OLD <<< remove a bus, because it does not exists anymore!");                       rmBus(busname);                     }                   }             } // end of synchronized(busses)              this.finishedScan = true;         }                           private void rmBus(Object busname){           USB bus = (USB) busses.get(busname);           if(Windows.debugWatcher) System.out.println(Windows.createUSB + " Watcher:rmBus() >>> REMOVE <<< BUS[" + bus.getBusNum() + "] REMOVED!  inform the USBListener that a bus is removed ");                      for(int i = 0; i < listeners.size(); i++){               USBListener listener;               listener = (USBListener) listeners.get(i);                 try{                  listener.busRemoved(bus);                 }                catch(Exception e){                  e.printStackTrace();                   }           }                        busses.remove(busname);           bus.kill();                                   }                           private void mkBus(String hostControllerDevicePath, int busnum)           throws IOException{              USB bus;              String hostControllerName = Windows.getHostControllerName(hostControllerDevicePath);                            boolean done = false;              Windows.createUSB = false;              bus = null;              while(!Windows.createUSB){                if(!done){                    if(Windows.debugWatcher) System.out.println(Windows.createUSB + " Watcher:mkBus() >>> ADD <<< BUS[" + busnum + "]");                    bus = new USB( hostControllerName,                             hostControllerDevicePath,                              busnum,                              listeners,                              self);                    done = true;                }              }                                  if(bus == null)                if(Windows.debugWatcher) System.out.println(Windows.createUSB + " Watcher:mkBus() >>> ADD <<< BUS[" + busnum + "] not created!!! >>> FAILURE <<<");              else                if(Windows.debugWatcher) System.out.println(Windows.createUSB + " Watcher:mkBus() >>> ADD <<< BUS[" + busnum + "] created! BUS Object: " + bus);                            busses.put(hostControllerDevicePath,bus);              if(Windows.debugWatcher) System.out.println(Windows.createUSB + " Watcher:mkBus() >>> ADD <<< BUS[" + busnum + "] inform the USBListener that a bus is added");              for(int i=0; i < listeners.size(); i++){                USBListener listener;                listener = (USBListener) listeners.get(i);                try{                  listener.busAdded(bus);                 }                catch(Exception e){                  e.printStackTrace();                   }              } // end for         }     } // end of class Watcher          }