public SortedInvertedIndexReader(File file, int cardinality, boolean isMmap) throws IOException {
this.cardinality = cardinality;
if (isMmap) {
indexReader =
FixedByteSingleValueMultiColReader.forMmap(file, cardinality, 2, new int[] {4, 4});
} else {
indexReader =
FixedByteSingleValueMultiColReader.forHeap(file, cardinality, 2, new int[] {4, 4});
}
}
@Override
public boolean unload() throws Exception {
indexFileReader.close();
dictionaryReader.close();
forwardIndexReader.close();
return true;
}
@Override
public int[] getMinMaxRangeFor(int dictId) {
int[] ret = new int[2];
if (dictId >= cardinality) {
return ret;
}
ret[0] = indexReader.getInt(dictId, 0);
ret[1] = indexReader.getInt(dictId, 1);
return ret;
}
@Override
public ImmutableRoaringBitmap getImmutable(int idx) {
if (idx >= cardinality) {
return new MutableRoaringBitmap();
}
MutableRoaringBitmap rr = new MutableRoaringBitmap();
int min = indexReader.getInt(idx, 0);
int max = indexReader.getInt(idx, 1);
for (int i = min; i <= max; i++) {
rr.add(i);
}
return rr;
}
@Override
public void close() throws IOException {
indexReader.close();
}
public SortedInvertedIndexReader(FixedByteSingleValueMultiColReader indexReader) {
this.indexReader = indexReader;
this.cardinality = indexReader.getNumberOfRows();
}