code: public boolean isSystemPath(String name)
      {
          name=name.replace('/','.');
          while(name.startsWith("."))
              name=name.substring(1);
  
          String[] system_classes=_context.getSystemClasses();
          if (system_classes!=null)
          {
              for (int i=0;i<system_classes.length;i++)
              {
                  boolean result=true;
                  String c=system_classes[i];
                  if (c.startsWith("-"))
                  {
                      c=c.substring(1);
                      result=false;
                  }
                  
                  if (c.endsWith("."))
                  {
                      if (name.startsWith(c))
                          return result;
                  }
                  else if (name.equals(c))
                      return result;
              }
          }
          
          return false;
      }
docs: /* ------------------------------------------------------------