public boolean readIndex(String filename, long gribLastModified, CollectionManager.Force force)
throws IOException {
File idxFile = GribCollection.getIndexFile(filename + GBX9_IDX);
if (!idxFile.exists()) return false;
long idxModified = idxFile.lastModified();
if ((force != CollectionManager.Force.nocheck) && (idxModified < gribLastModified))
return false;
// force new index if file was updated
FileInputStream fin =
new FileInputStream(idxFile); // LOOK need DiskCache for non-writeable directories
try {
//// check header is ok
if (!NcStream.readAndTest(fin, MAGIC_START.getBytes())) {
log.info("Bad magic number of grib index, on file" + idxFile);
return false;
}
int v = NcStream.readVInt(fin);
if (v != version) {
if ((v == 0) || (v > version))
throw new IOException(
"Grib1Index found version " + v + ", want version " + version + " on " + filename);
if (log.isDebugEnabled())
log.debug(
"Grib1Index found version " + v + ", want version " + version + " on " + filename);
return false;
}
int size = NcStream.readVInt(fin);
if (size <= 0 || size > 100 * 1000 * 1000) { // try to catch garbage
log.warn("Grib1Index bad size = {} for {} ", size, filename);
return false;
}
byte[] m = new byte[size];
NcStream.readFully(fin, m);
Grib1IndexProto.Grib1Index proto = Grib1IndexProto.Grib1Index.parseFrom(m);
String fname = proto.getFilename();
if (debug) System.out.printf("%s for %s%n", fname, filename);
gdsList = new ArrayList<Grib1SectionGridDefinition>(proto.getGdsListCount());
for (Grib1IndexProto.Grib1GdsSection pgds : proto.getGdsListList()) {
Grib1SectionGridDefinition gds = readGds(pgds);
gdsList.add(gds);
}
if (debug) System.out.printf(" read %d gds%n", gdsList.size());
records = new ArrayList<Grib1Record>(proto.getRecordsCount());
for (Grib1IndexProto.Grib1Record precord : proto.getRecordsList()) {
records.add(readRecord(precord));
}
if (debug) System.out.printf(" read %d records%n", records.size());
} catch (java.lang.NegativeArraySizeException e) {
log.error("GribIndex failed on " + filename, e);
return false;
} catch (IOException e) {
log.error("GribIndex failed on " + filename, e);
return false;
} finally {
fin.close();
}
return true;
}
