An interesting java function

Today I wrote a java function which I enjoyed while writing. It took 2 hours to write this small looking function. In fact I saw similar concept in Shashank Khare's code of Nextgen ( if remember the product name correctly). Though it was in C code. Handling multiple flags in single string type variable, each bit of it will decide flag value for different variable!

public String execute() {
  
 String returnType=null;
 if (StringUtils.isBlank(_orderType)) {
  List privileges = (List) _session.get(HuskyConstants.PRIVILEGE_LIST);
        if (privileges != null ) {
         int _privilegeType=0;
            for (Iterator i = privileges.iterator(); i.hasNext();) {
                LhpPrivilege thisPriv = (LhpPrivilege)i.next();
                 /* determine what order privileges a user has. if they only have one, forward them to that option. */
                 switch ( thisPriv.getPrivilegeId().intValue()){
                  case 67  : _privilegeType+=4;break; // self address
                  case 65  : _privilegeType+=2;break; // field sales rep
                  case 2006  : _privilegeType+=8;break; //physicians
                  case 68  : _privilegeType+=1;break; // enter address
                 }
             }
             orderPrivilegeType = Integer.toBinaryString(_privilegeType);
             //add preceeding 0s.
             int lStr = orderPrivilegeType.length();
             for (int l=0; l<4-lStr; l++)orderPrivilegeType ="0"+orderPrivilegeType;
            
             //if user has only one type of order placing privilege
             if ( Integer.bitCount(_privilegeType)==1)
              returnType= "00"+(int)((Math.log(Integer.highestOneBit(_privilegeType))/Math.log(2)))+"_success";
             else returnType = INPUT;
         }   return returnType;
  } else {
   return setType();   
  }
 }