@Override
  public boolean isValidFile(RandomAccessFile raf) throws IOException {
    try {
      gemreader = makeStationReader();
      return gemreader.init(raf, false);
    } catch (Exception ioe) {
      return false;
    }
  }
@Override
  public boolean isValidFile(RandomAccessFile raf) throws IOException {
    try {
      gemreader = makeStationReader();
      return gemreader.init(raf, false);
    } catch (Exception ioe) {
      return false;
    }
  }
@ Override public boolean isValidFile ( RandomAccessFile raf ) throws IOException { try { gemreader = makeStationReader ( ) ; return gemreader . init ( raf , false ) ; } catch ( Exception ioe ) { return false ; } }
Is this a valid file?

@param raf RandomAccessFile to check
@return true if a valid Gempak grid file
@throws IOException problem reading file
Is this a valid file?