Example usage for org.apache.lucene.util FixedBitSet getAndClear

Introduction

In this page you can find the example usage for org.apache.lucene.util FixedBitSet getAndClear.

Prototype

public boolean getAndClear(int index) 

Source Link

Usage

From source file:de.unihildesheim.iw.lucene.search.EmptyFieldFilter.java

License:Open Source License

@Override
public DocIdSet getDocIdSet(@NotNull final LeafReaderContext context, @Nullable final Bits acceptDocs)
        throws IOException {
    FixedBitSet checkBits;
    final LeafReader reader = context.reader();
    final int maxDoc = reader.maxDoc();

    BitSet finalBits = new SparseFixedBitSet(maxDoc);
    if (acceptDocs == null) {
        checkBits = BitsUtils.bits2FixedBitSet(reader.getLiveDocs());
        if (checkBits == null) {
            // all live
            checkBits = new FixedBitSet(maxDoc);
            checkBits.set(0, checkBits.length());
        }/*from ww  w .ja va 2 s  .  c  o  m*/
    } else {
        checkBits = BitsUtils.bits2FixedBitSet(acceptDocs);
    }

    @Nullable
    final Terms terms = reader.terms(this.field);
    if (terms != null) {
        final int termsDocCount = terms.getDocCount();

        if (termsDocCount != 0) {
            if (termsDocCount == maxDoc) {
                // all matching
                finalBits = checkBits;
            } else {
                @Nullable
                final Terms t = reader.terms(this.field);
                if (t != null) {
                    PostingsEnum pe = null;
                    final TermsEnum te = t.iterator(null);
                    int docId;
                    while (te.next() != null) {
                        pe = te.postings(checkBits, pe, (int) PostingsEnum.NONE);
                        while ((docId = pe.nextDoc()) != DocIdSetIterator.NO_MORE_DOCS) {
                            if (checkBits.getAndClear(docId)) {
                                finalBits.set(docId);
                            }
                        }
                    }
                }
            }
        }
    }
    return new BitDocIdSet(finalBits);
}

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