public static class UserAgentTools {
    
  public static String getFirstVersionNumber(String a_userAgent, int a_position, int numDigits) {
    String ver = getVersionNumber(a_userAgent, a_position);
    if (ver==null) return "";
    int i = 0;
    String res="";
    while (i<ver.length() && i<numDigits) {
      res+=String.valueOf(ver.charAt(i));
      i++;
    }
    return res;
  }
  public static String getVersionNumber(String a_userAgent, int a_position) {
      if (a_position<0) return "";
      StringBuffer res = new StringBuffer();
      int status = 0;
      
      while (a_position < a_userAgent.length()) {
          char c = a_userAgent.charAt(a_position);
          switch (status) {
            case 0: //<SPAN class="codecomment"> No valid digits encountered yet</span>
              if (c == ' ' || c=='/') break;
              if (c == ';' || c==')') return "";
              status = 1;
            case 1: //<SPAN class="codecomment"> Version number in progress</span>
              if (c == ';' || c=='/' || c==')' || c=='(' || c=='[') return res.toString().trim();
              if (c == ' ') status = 2;
              res.append(c);
              break;
            case 2: //<SPAN class="codecomment"> Space encountered - Might need to end the parsing</span>
              if ((Character.isLetter(c) && 
                   Character.isLowerCase(c)) ||
                  Character.isDigit(c)) {
                  res.append(c);
                  status=1;
              } else
                  return res.toString().trim();
              break;
          }
          a_position++;
      }
      return res.toString().trim();
  }

  public static String[]getArray(String a, String b, String c) {
    String[]res = new String[3];
    res[0]=a;
    res[1]=b;
    res[2]=c;
    return res;
  }

  public static String[] getBotName(String userAgent) {
    userAgent = userAgent.toLowerCase();
    int pos=0;
    String res=null;
    if ((pos=userAgent.indexOf("help.yahoo.com/"))>-1) {
        res= "Yahoo";
        pos+=7;
    } else
    if ((pos=userAgent.indexOf("google/"))>-1) {
        res= "Google";
        pos+=7;
    } else
    if ((pos=userAgent.indexOf("msnbot/"))>-1) {
        res= "MSNBot";
        pos+=7;
    } else
    if ((pos=userAgent.indexOf("googlebot/"))>-1) {
        res= "Google";
        pos+=10;
    } else
    if ((pos=userAgent.indexOf("webcrawler/"))>-1) {
        res= "WebCrawler";
        pos+=11;
    } else
    //<SPAN class="codecomment"> The following two bots don't have any version number in their User-Agent strings.</span>
    if ((pos=userAgent.indexOf("inktomi"))>-1) {
        res= "Inktomi";
        pos=-1;
    } else
    if ((pos=userAgent.indexOf("teoma"))>-1) {
        res= "Teoma";
        pos=-1;
    }
    if (res==null) return null;
    return getArray(res,res,res + getVersionNumber(userAgent,pos));
  }
  
  
  public static String[] getOS(String userAgent) {
    if (getBotName(userAgent)!=null) return getArray("Bot","Bot","Bot");
    String[]res = null;
    int pos;
    if ((pos=userAgent.indexOf("Windows-NT"))>-1) {
        res = getArray("Win","WinNT","Win"+getVersionNumber(userAgent,pos+8));
    } else
    if (userAgent.indexOf("Windows NT")>-1) {
        //<SPAN class="codecomment"> The different versions of Windows NT are decoded in the verbosity level 2</span>
        //<SPAN class="codecomment"> ie: Windows NT 5.1 = Windows XP</span>
        if ((pos=userAgent.indexOf("Windows NT 5.1"))>-1) {
            res = getArray("Win","WinXP","Win"+getVersionNumber(userAgent,pos+7));
        } else
        if ((pos=userAgent.indexOf("Windows NT 6.0"))>-1) {
            res = getArray("Win","Vista","Vista"+getVersionNumber(userAgent,pos+7));
        } else
        if ((pos=userAgent.indexOf("Windows NT 6.1"))>-1) {
            res = getArray("Win","Seven","Seven "+getVersionNumber(userAgent,pos+7));
        } else
        if ((pos=userAgent.indexOf("Windows NT 5.0"))>-1) {
            res = getArray("Win","Win2000","Win"+getVersionNumber(userAgent,pos+7));
        } else
        if ((pos=userAgent.indexOf("Windows NT 5.2"))>-1) {
            res = getArray("Win","Win2003","Win"+getVersionNumber(userAgent,pos+7));
        } else
        if ((pos=userAgent.indexOf("Windows NT 4.0"))>-1) {
            res = getArray("Win","WinNT4","Win"+getVersionNumber(userAgent,pos+7));
        } else
        if ((pos=userAgent.indexOf("Windows NT)"))>-1) {
            res = getArray("Win","WinNT","WinNT");
        } else
        if ((pos=userAgent.indexOf("Windows NT;"))>-1) {
            res = getArray("Win","WinNT","WinNT");
        } else
        res = getArray("Win","<B>WinNT?</B>","<B>WinNT?</B>");
    } else
    if (userAgent.indexOf("Win")>-1) {
        if (userAgent.indexOf("Windows")>-1) {
            if ((pos=userAgent.indexOf("Windows 98"))>-1) {
                res = getArray("Win","Win98","Win"+getVersionNumber(userAgent,pos+7));
            } else
            if ((pos=userAgent.indexOf("Windows_98"))>-1) {
                res = getArray("Win","Win98","Win"+getVersionNumber(userAgent,pos+8));
            } else
            if ((pos=userAgent.indexOf("Windows 2000"))>-1) {
                res = getArray("Win","Win2000","Win"+getVersionNumber(userAgent,pos+7));
            } else
            if ((pos=userAgent.indexOf("Windows 95"))>-1) {
                res = getArray("Win","Win95","Win"+getVersionNumber(userAgent,pos+7));
            } else
            if ((pos=userAgent.indexOf("Windows 9x"))>-1) {
                res = getArray("Win","Win9x","Win"+getVersionNumber(userAgent,pos+7));
            } else
            if ((pos=userAgent.indexOf("Windows ME"))>-1) {
                res = getArray("Win","WinME","Win"+getVersionNumber(userAgent,pos+7));
            } else
            if ((pos=userAgent.indexOf("Windows CE;"))>-1) {
                res = getArray("Win","WinCE","WinCE");
            } else
            if ((pos=userAgent.indexOf("Windows 3.1"))>-1) {
                res = getArray("Win","Win31","Win"+getVersionNumber(userAgent,pos+7));
            }
            //<SPAN class="codecomment"> If no version was found, rely on the following code to detect "WinXX"</span>
            //<SPAN class="codecomment"> As some User-Agents include two references to Windows</span>
            //<SPAN class="codecomment"> Ex: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.5)</span>
        }
        if (res == null) {
            if ((pos=userAgent.indexOf("Win98"))>-1) {
                res = getArray("Win","Win98","Win"+getVersionNumber(userAgent,pos+3));
            } else
            if ((pos=userAgent.indexOf("Win31"))>-1) {
                res = getArray("Win","Win31","Win"+getVersionNumber(userAgent,pos+3));
            } else
            if ((pos=userAgent.indexOf("Win95"))>-1) {
                res = getArray("Win","Win95","Win"+getVersionNumber(userAgent,pos+3));
            } else
            if ((pos=userAgent.indexOf("Win 9x"))>-1) {
                res = getArray("Win","Win9x","Win"+getVersionNumber(userAgent,pos+3));
            } else
            if ((pos=userAgent.indexOf("WinNT4.0"))>-1) {
                res = getArray("Win","WinNT4","Win"+getVersionNumber(userAgent,pos+3));
            } else
            if ((pos=userAgent.indexOf("WinNT"))>-1) {
                res = getArray("Win","WinNT","Win"+getVersionNumber(userAgent,pos+3));
            }
        }
        if (res == null) {
            if ((pos=userAgent.indexOf("Windows"))>-1) {
              res = getArray("Win","<B>Win?</B>","<B>Win?"+getVersionNumber(userAgent,pos+7)+"</B>");
            } else
            if ((pos=userAgent.indexOf("Win"))>-1) {
              res = getArray("Win","<B>Win?</B>","<B>Win?"+getVersionNumber(userAgent,pos+3)+"</B>");
            } else
              //<SPAN class="codecomment"> Should not happen at this point</span>
              res = getArray("Win","<B>Win?</B>","<B>Win?</B>");
        }
    } else
    if ((pos=userAgent.indexOf("Mac OS X"))>-1) {
        if ((userAgent.indexOf("iPhone"))>-1) {
            pos = userAgent.indexOf("iPhone OS");
            if ((userAgent.indexOf("iPod"))>-1) {
                res = getArray("iOS","iOS-iPod","iOS-iPod "+((pos<0)?"":getVersionNumber(userAgent,pos+9)));
            } else {
                res = getArray("iOS","iOS-iPhone","iOS-iPhone "+((pos<0)?"":getVersionNumber(userAgent,pos+9)));
            }
        } else
        if ((userAgent.indexOf("iPad"))>-1) {
            pos = userAgent.indexOf("CPU OS");
            res = getArray("iOS","iOS-iPad","iOS-iPad "+((pos<0)?"":getVersionNumber(userAgent,pos+6)));
        } else
            res = getArray("Mac","MacOSX","MacOS "+getVersionNumber(userAgent,pos+8));
    } else
    if ((pos=userAgent.indexOf("Android"))>-1) {
        res = getArray("Linux","Android","Android "+getVersionNumber(userAgent,pos+8));
    } else
    if ((pos=userAgent.indexOf("Mac_PowerPC"))>-1) {
        res = getArray("Mac","MacPPC","MacOS "+getVersionNumber(userAgent,pos+3));
    } else
    if ((pos=userAgent.indexOf("Macintosh"))>-1) {
        if (userAgent.indexOf("PPC")>-1)
            res = getArray("Mac","MacPPC","Mac PPC");
        else
            res = getArray("Mac?","Mac?","MacOS?");
    } else
    if ((pos=userAgent.indexOf("FreeBSD"))>-1) {
        res = getArray("*BSD","*BSD FreeBSD","FreeBSD "+getVersionNumber(userAgent,pos+7));
    } else
    if ((pos=userAgent.indexOf("OpenBSD"))>-1) {
        res = getArray("*BSD","*BSD OpenBSD","OpenBSD "+getVersionNumber(userAgent,pos+7));
    } else
    if ((pos=userAgent.indexOf("Linux"))>-1) {
        String detail = "Linux "+getVersionNumber(userAgent,pos+5);
        String med = "Linux";
        if ((pos=userAgent.indexOf("Ubuntu/"))>-1) {
            detail = "Ubuntu "+getVersionNumber(userAgent,pos+7);
            med+=" Ubuntu";
        }
        res = getArray("Linux",med,detail);
    } else
    if ((pos=userAgent.indexOf("CentOS"))>-1) {
        res = getArray("Linux","Linux CentOS","CentOS");
    } else
    if ((pos=userAgent.indexOf("NetBSD"))>-1) {
        res = getArray("*BSD","*BSD NetBSD","NetBSD "+getVersionNumber(userAgent,pos+6));
    } else
    if ((pos=userAgent.indexOf("Unix"))>-1) {
        res = getArray("Linux","Linux","Linux "+getVersionNumber(userAgent,pos+4));
    } else
    if ((pos=userAgent.indexOf("SunOS"))>-1) {
        res = getArray("Unix","SunOS","SunOS"+getVersionNumber(userAgent,pos+5));
    } else
    if ((pos=userAgent.indexOf("IRIX"))>-1) {
        res = getArray("Unix","IRIX","IRIX"+getVersionNumber(userAgent,pos+4));
    } else
    if ((pos=userAgent.indexOf("SonyEricsson"))>-1) {
        res = getArray("SonyEricsson","SonyEricsson","SonyEricsson"+getVersionNumber(userAgent,pos+12));
    } else
    if ((pos=userAgent.indexOf("Nokia"))>-1) {
        res = getArray("Nokia","Nokia","Nokia"+getVersionNumber(userAgent,pos+5));
    } else
    if ((pos=userAgent.indexOf("BlackBerry"))>-1) {
        res = getArray("BlackBerry","BlackBerry","BlackBerry"+getVersionNumber(userAgent,pos+10));
    } else
    if ((pos=userAgent.indexOf("SymbianOS"))>-1) {
        res = getArray("SymbianOS","SymbianOS","SymbianOS"+getVersionNumber(userAgent,pos+10));
    } else
    if ((pos=userAgent.indexOf("BeOS"))>-1) {
        res = getArray("BeOS","BeOS","BeOS");
    } else
    if ((pos=userAgent.indexOf("Nintendo Wii"))>-1) {
        res = getArray("Nintendo Wii","Nintendo Wii","Nintendo Wii"+getVersionNumber(userAgent,pos+10));
    } else
    if ((pos=userAgent.indexOf("J2ME/MIDP"))>-1) {
        res = getArray("Java","J2ME","J2ME/MIDP");
    } else
    res = getArray("<b>?</b>","<b>?</b>","<b>?</b>");
    return res;
  }

  
  public static String []getBrowser(String userAgent) {
    String []botName;
    if ((botName=getBotName(userAgent))!=null) return botName;
    String[]res = null;
    int pos;
    if ((pos=userAgent.indexOf("Lotus-Notes/"))>-1) {
        res = getArray("LotusNotes","LotusNotes","LotusNotes"+getVersionNumber(userAgent,pos+12));
    } else
    if ((pos=userAgent.indexOf("Opera"))>-1) {
        String ver = getVersionNumber(userAgent,pos+5);
        res = getArray("Opera","Opera"+getFirstVersionNumber(userAgent,pos+5,1),"Opera"+ver);
        if ((pos=userAgent.indexOf("Opera Mini/"))>-1) {
            String ver2 = getVersionNumber(userAgent,pos+11);
            res = getArray("Opera","Opera Mini","Opera Mini "+ver2);
        } else
        if ((pos=userAgent.indexOf("Opera Mobi/"))>-1) {
            String ver2 = getVersionNumber(userAgent,pos+11);
            res = getArray("Opera","Opera Mobi","Opera Mobi "+ver2);
        }
    } else
    if (userAgent.indexOf("MSIE")>-1) {
        if ((pos=userAgent.indexOf("MSIE 6.0"))>-1) {
            res = getArray("MSIE","MSIE6","MSIE"+getVersionNumber(userAgent,pos+4));
        } else
        if ((pos=userAgent.indexOf("MSIE 5.0"))>-1) {
            res = getArray("MSIE","MSIE5","MSIE"+getVersionNumber(userAgent,pos+4));
        } else
        if ((pos=userAgent.indexOf("MSIE 5.5"))>-1) {
            res = getArray("MSIE","MSIE5.5","MSIE"+getVersionNumber(userAgent,pos+4));
        } else
        if ((pos=userAgent.indexOf("MSIE 5."))>-1) {
            res = getArray("MSIE","MSIE5.x","MSIE"+getVersionNumber(userAgent,pos+4));
        } else
        if ((pos=userAgent.indexOf("MSIE 4"))>-1) {
            res = getArray("MSIE","MSIE4","MSIE"+getVersionNumber(userAgent,pos+4));
        } else
        if ((pos=userAgent.indexOf("MSIE 7"))>-1 && userAgent.indexOf("Trident/4.0")<0) {
            res = getArray("MSIE","MSIE7","MSIE"+getVersionNumber(userAgent,pos+4));
        } else
        if ((pos=userAgent.indexOf("MSIE 8"))>-1 || userAgent.indexOf("Trident/4.0")>-1) {
            res = getArray("MSIE","MSIE8","MSIE"+getVersionNumber(userAgent,pos+4));
        } else
        if ((pos=userAgent.indexOf("MSIE 9"))>-1 || userAgent.indexOf("Trident/4.0")>-1) {
            res = getArray("MSIE","MSIE9","MSIE"+getVersionNumber(userAgent,pos+4));
        } else
        res = getArray("MSIE","<B>MSIE?</B>","<B>MSIE?"+getVersionNumber(userAgent,userAgent.indexOf("MSIE")+4)+"</B>");
    } else
    if ((pos=userAgent.indexOf("Gecko/"))>-1) {
        res = getArray("Gecko","Gecko","Gecko"+getFirstVersionNumber(userAgent,pos+5,4));
        if ((pos=userAgent.indexOf("Camino/"))>-1) {
            res[1]+="(Camino)";
            res[2]+="(Camino"+getVersionNumber(userAgent,pos+7)+")";
        } else
        if ((pos=userAgent.indexOf("Chimera/"))>-1) {
            res[1]+="(Chimera)";
            res[2]+="(Chimera"+getVersionNumber(userAgent,pos+8)+")";
        } else
        if ((pos=userAgent.indexOf("Firebird/"))>-1) {
            res[1]+="(Firebird)";
            res[2]+="(Firebird"+getVersionNumber(userAgent,pos+9)+")";
        } else
        if ((pos=userAgent.indexOf("Phoenix/"))>-1) {
            res[1]+="(Phoenix)";
            res[2]+="(Phoenix"+getVersionNumber(userAgent,pos+8)+")";
        } else
        if ((pos=userAgent.indexOf("Galeon/"))>-1) {
            res[1]+="(Galeon)";
            res[2]+="(Galeon"+getVersionNumber(userAgent,pos+7)+")";
        } else
        if ((pos=userAgent.indexOf("Firefox/"))>-1) {
            res[1]+="(Firefox)";
            res[2]+="(Firefox"+getVersionNumber(userAgent,pos+8)+")";
        } else
        if ((pos=userAgent.indexOf("Netscape/"))>-1) {
            if ((pos=userAgent.indexOf("Netscape/6"))>-1) {
                res[1]+="(NS6)";
                res[2]+="(NS"+getVersionNumber(userAgent,pos+9)+")";
            } else
            if ((pos=userAgent.indexOf("Netscape/7"))>-1) {
                res[1]+="(NS7)";
                res[2]+="(NS"+getVersionNumber(userAgent,pos+9)+")";
            } else 
            if ((pos=userAgent.indexOf("Netscape/8"))>-1) {
                res[1]+="(NS8)";
                res[2]+="(NS"+getVersionNumber(userAgent,pos+9)+")";
            } else 
            if ((pos=userAgent.indexOf("Netscape/9"))>-1) {
                res[1]+="(NS9)";
                res[2]+="(NS"+getVersionNumber(userAgent,pos+9)+")";
            } else {
                res[1]+="(NS?)";
                res[2]+="(NS?"+getVersionNumber(userAgent,userAgent.indexOf("Netscape/")+9)+")";
            }
        }
    } else
    if ((pos=userAgent.indexOf("Netscape/"))>-1) {
        if ((pos=userAgent.indexOf("Netscape/4"))>-1) {
            res = getArray("NS","NS4","NS"+getVersionNumber(userAgent,pos+9));
        } else
            res = getArray("NS","NS?","NS?"+getVersionNumber(userAgent,pos+9));
    } else
    if ((pos=userAgent.indexOf("Chrome/"))>-1) {
        res = getArray("KHTML","KHTML(Chrome)","KHTML(Chrome"+getVersionNumber(userAgent,pos+6)+")");
    } else
    if ((pos=userAgent.indexOf("Safari/"))>-1) {
        res = getArray("KHTML","KHTML(Safari)","KHTML(Safari"+getVersionNumber(userAgent,pos+6)+")");
    } else
    if ((pos=userAgent.indexOf("Konqueror/"))>-1) {
        res = getArray("KHTML","KHTML(Konqueror)","KHTML(Konqueror"+getVersionNumber(userAgent,pos+9)+")");
    } else
    if ((pos=userAgent.indexOf("KHTML"))>-1) {
        res = getArray("KHTML","KHTML?","KHTML?("+getVersionNumber(userAgent,pos+5)+")");
    } else
    if ((pos=userAgent.indexOf("NetFront"))>-1) {
        res = getArray("NetFront","NetFront","NetFront "+getVersionNumber(userAgent,pos+8));
    } else
    if ((pos=userAgent.indexOf("BlackBerry"))>-1) {
        pos=userAgent.indexOf("/",pos+2);
        res = getArray("BlackBerry","BlackBerry","BlackBerry"+getVersionNumber(userAgent,pos+1));
    } else
    //<SPAN class="codecomment"> We will interpret Mozilla/4.x as Netscape Communicator is and only if x</span>
    //<SPAN class="codecomment"> is not 0 or 5</span>
    if (userAgent.indexOf("Mozilla/4.")==0 &&
        userAgent.indexOf("Mozilla/4.0")<0 &&
        userAgent.indexOf("Mozilla/4.5 ")<0) {
        res = getArray("Communicator","Communicator","Communicator"+getVersionNumber(userAgent,pos+8));
    } else
    return getArray("<B>?</B>","<B>?</B>","<B>?</B>");
    return res;
  }
}