/**
* Grib edition number 1, 2 or 0 not a Grib file.
*
* @return int 0 not a Grib file, 1 Grib1, 2 Grib2
* @throws NotSupportedException
* @throws IOException
*/
public final int getEdition() throws IOException, NotSupportedException {
int check = 0; // Not a valid Grib file
long length = (raf.length() < 4000L) ? raf.length() : 4000L;
if (!seekHeader(raf, length)) {
return 0; // not valid Grib file
}
// Read Section 0 Indicator Section to get Edition number
Grib1IndicatorSection is = new Grib1IndicatorSection(raf); // section 0
return is.getGribEdition();
} // end getEdition
/**
* scans a Grib file to gather information that could be used to create an index or dump the
* metadata contents.
*
* @param parm
* @throws NotSupportedException
* @throws IOException if raf does not contain a valid GRIB record
*/
public final boolean scan(int[] parm) throws NotSupportedException, IOException {
long start = System.currentTimeMillis();
// stores the number of times a particular GDS is used
HashMap gdsCounter = new HashMap();
Grib1ProductDefinitionSection pds = null;
Grib1GridDefinitionSection gds = null;
long gdsOffset = 0;
DataOutputStream dos = new DataOutputStream(System.out);
// System.out.println("file position =" + raf.getFilePointer());
long SOR = raf.getFilePointer();
while (raf.getFilePointer() < raf.length()) {
SOR = raf.getFilePointer();
if (seekHeader(raf, raf.length())) {
// Read Section 0 Indicator Section
Grib1IndicatorSection is = new Grib1IndicatorSection(raf);
// System.out.println( "Grib record length=" + is.getGribLength());
// EOR (EndOfRecord) calculated so skipping data sections is faster
long EOR = raf.getFilePointer() + is.getGribLength() - is.getLength();
// long SOR = raf.getFilePointer() - is.getLength();
// skip Grib 2 records in a Grib 1 file
if (is.getGribEdition() == 2) {
// System.out.println( "Error Grib 2 record in Grib1 file" ) ;
raf.seek(EOR);
continue;
}
if (parm[0] == -1) { // extract only 1st record
raf.seek(SOR);
byte[] oneRecord = new byte[(int) is.getGribLength()];
raf.read(oneRecord);
dos.write(oneRecord, 0, oneRecord.length);
dos.flush();
break;
}
long dataOffset = 0;
try { // catch all exceptions and seek to EOR
// Read Section 1 Product Definition Section PDS
pds = new Grib1ProductDefinitionSection(raf);
if (pds.getLengthErr()) {
raf.seek(EOR);
continue;
}
Grib1PDSVariables pdsv = pds.getPdsVars();
if (getParameter && parm[0] == pdsv.getParameterNumber()) {
raf.seek(SOR);
byte[] oneRecord = new byte[(int) is.getGribLength()];
raf.read(oneRecord);
dos.write(oneRecord, 0, oneRecord.length);
dos.flush();
} else if (parm[0] <= pdsv.getForecastTime() && parm[1] >= pdsv.getForecastTime()) {
raf.seek(SOR);
byte[] oneRecord = new byte[(int) is.getGribLength()];
raf.read(oneRecord);
dos.write(oneRecord, 0, oneRecord.length);
dos.flush();
}
raf.seek(EOR);
continue;
} catch (Exception e) {
// .println( "Caught Exception scannning record" );
e.printStackTrace();
raf.seek(EOR);
continue;
}
} // end if seekHeader
// System.out.println( "raf.getFilePointer()=" + raf.getFilePointer());
// System.out.println( "raf.length()=" + raf.length() );
} // end while raf.getFilePointer() < raf.length()
// System.out.println("GribInput: processed in " +
// (System.currentTimeMillis()- start) + " milliseconds");
dos.close();
return true;
} // end scan