code: public boolean hasCacheContent(String rfsName) {
  
          File f = new File(rfsName);
          if (f.exists()) {
              return true;
          }
          return false;
      }
docs: Returns the the requested file is available within the cache.<p>
  
  @param rfsName the file name
  
  @return <code>true</code> if the file is available