private boolean fillDownsampledReadsCache() {
while (nestedSAMIterator.hasNext() && !downsampler.hasFinalizedItems()) {
downsampler.submit(nestedSAMIterator.next());
}
if (!nestedSAMIterator.hasNext()) {
downsampler.signalEndOfInput();
}
// use returned collection directly rather than make a copy, for speed
downsampledReadsCache = downsampler.consumeFinalizedItems();
downsampledReadsCacheIterator = downsampledReadsCache.iterator();
return downsampledReadsCacheIterator.hasNext();
}
public void close() {
nestedSAMIterator.close();
}