public static void main(String[] args) throws IOException {
RandomAccessFile raf =
new RandomAccessFile("Q:/cdmUnitTest/formats/grib2/sfc_d01_20080430_1200_f00000.grb2", "r");
Grib2RecordScanner scan = new Grib2RecordScanner(raf);
while (scan.hasNext()) scan.next();
raf.close();
}
/**
* tricky bit of business. recapture the entire record based on drs position. for validation.
*
* @param raf from this RandomAccessFile
* @param drsPos Grib2SectionDataRepresentation starts here
*/
public static Grib2Record findRecordByDrspos(RandomAccessFile raf, long drsPos)
throws IOException {
Grib2Record result = null;
Grib2RecordScanner scanner = new Grib2RecordScanner(raf);
long pos = Math.max(0, drsPos - 10000); // go back 10000 bytes
raf.seek(pos);
while (scanner.hasNext()) { // find GRIB header
result = scanner.next();
if (result.getDataRepresentationSection().getStartingPosition() == drsPos) return result;
if (raf.getFilePointer() > drsPos) break;
}
return null;
}
