@Override
public RandomAccessDocIdSet getRandomAccessDocIdSet(BoboIndexReader reader) throws IOException {
final MultiValueFacetDataCache dataCache =
(MultiValueFacetDataCache) _facetHandler.getFacetData(reader);
final int[] index = _valueConverter.convert(dataCache, _vals);
final BigNestedIntArray nestedArray = dataCache._nestedArray;
final OpenBitSet bitset = new OpenBitSet(dataCache.valArray.size());
for (int i : index) {
bitset.fastSet(i);
}
if (_takeCompliment) {
// flip the bits
int size = dataCache.valArray.size();
for (int i = 0; i < size; ++i) {
bitset.fastFlip(i);
}
}
long count = bitset.cardinality();
if (count == 0) {
final DocIdSet empty = EmptyDocIdSet.getInstance();
return new RandomAccessDocIdSet() {
@Override
public boolean get(int docId) {
return false;
}
@Override
public DocIdSetIterator iterator() throws IOException {
return empty.iterator();
}
};
} else {
return new RandomAccessDocIdSet() {
@Override
public DocIdSetIterator iterator() {
return new MultiValueOrFacetDocIdSetIterator(dataCache, bitset);
}
@Override
public final boolean get(int docId) {
return nestedArray.contains(docId, bitset);
}
};
}
}
public double getFacetSelectivity(BoboIndexReader reader) {
double selectivity = 0;
MultiValueFacetDataCache dataCache =
(MultiValueFacetDataCache) _facetHandler.getFacetData(reader);
int[] idxes = _valueConverter.convert(dataCache, _vals);
if (idxes == null) {
return 0.0;
}
int accumFreq = 0;
for (int idx : idxes) {
accumFreq += dataCache.freqs[idx];
}
int total = reader.maxDoc();
selectivity = (double) accumFreq / (double) total;
if (selectivity > 0.999) {
selectivity = 1.0;
}
return selectivity;
}
