private GridProjected queryGrid(Dataset dataset, List<TimeSlice> tss) throws IOException {
// Create a bounding box that encompasses all time slices.
Box smbounds = timeSliceUtil.aggregateBounds(tss);
if (smbounds == null) throw new IOException("Could not determine bounds: no time slices.");
BoxReal bounds = new BoxReal(2);
bounds.getMin().setX(smbounds.getXMin());
bounds.getMin().setY(smbounds.getYMin());
bounds.getMax().setX(smbounds.getXMax());
bounds.getMax().setY(smbounds.getYMax());
// Resolution.
double cellSize = dataset.getResolution().toDouble();
VectorReal resolution = VectorReal.createEmpty(2);
resolution.setX(cellSize);
resolution.setY(cellSize);
// All files for a given dataset share a common coordinate system. So,
// we can just open one of the blank files and take a peek at it.
CoordinateSystem srs = null;
List<Band> bands = datasetDao.getBands(dataset.getId());
for (Band b : bands) {
Path blankTilePath = bandUtil.getBlankTilePath(dataset, b);
if (Files.notExists(blankTilePath)) continue;
NetcdfDataset ncd = NetcdfDataset.openDataset(blankTilePath.toString());
try {
ncd.enhance();
srs = ncd.getCoordinateSystems().get(0);
break;
} finally {
ncd.close();
}
}
if (srs == null) {
throw new IOException(
String.format(
"Could not determine "
+ "coordinate system for dataset %s. There may be no "
+ "tiles, or the bounds in the database may not match the "
+ "tiles stored on disk.",
dataset));
}
return new GridProjected(bounds, resolution, srs);
}
@Override
public NetcdfDataset open(
String uri,
String referential,
BoxReal boundsHint,
DateTime timeMin,
DateTime timeMax,
List<String> bands)
throws IOException {
NetcdfDataset ds;
VectorReal min = boundsHint.getMin();
VectorReal max = boundsHint.getMax();
Box bounds = new Box(min.getX(), min.getY(), max.getX(), max.getY());
Dataset dataset = findDataset(uri, referential);
if (dataset == null) {
throw new IOException(String.format("Could not find dataset %s", uri));
}
if (ndgConfigManager.getConfig().isFilelockingOn()) {
ReadWriteLock lock = getLock(dataset);
// If filelockingOn, then ensure can get all required read locks
if (lock.readLock().tryLock()) {
try {
ds = open(uri, dataset, bounds, timeMin, timeMax, bands);
try {
ds = new RsaNetcdfDataset(ds, lock);
} catch (IOException | RuntimeException e) {
if (ds != null) ds.close();
throw e;
}
} catch (IOException | RuntimeException e) {
lock.readLock().unlock();
throw e;
}
} else {
throw new IOException(String.format("Could not lock dataset %s", uri));
}
} else {
ds = open(uri, dataset, bounds, timeMin, timeMax, bands);
}
return ds;
}
