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

Introduction

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

Prototype

public void xor(DocIdSetIterator iter) throws IOException 

Source Link

Document

Does in-place XOR of the bits provided by the iterator.

Usage

From source file:org.geotoolkit.lucene.filter.SerialChainFilter.java

License:Open Source License

@Override
public DocIdSet getDocIdSet(final LeafReaderContext ctx, final Bits b)
        throws CorruptIndexException, IOException {

    final int chainSize = chain.size();
    final int actionSize = actionType.length;

    final FixedBitSet bits = (FixedBitSet) ((BitDocIdSet) chain.get(0).getDocIdSet(ctx, b)).bits();

    //if there is only an operand not we don't enter the loop
    int j = 0;/*from w  ww.  j av a 2  s  . c o  m*/
    if (actionType[j] == NOT) {
        bits.flip(0, ctx.reader().maxDoc());
        j++;
    }

    for (int i = 1; i < chainSize; i++) {

        LogicalFilterType action;
        if (j < actionSize) {
            action = actionType[j];
            j++;
        } else {
            action = DEFAULT;
        }

        final FixedBitSet nextFilterResponse = (FixedBitSet) ((BitDocIdSet) chain.get(i).getDocIdSet(ctx, b))
                .bits();

        //if the next operator is NOT we have to process the action before the current operand
        if (j < actionSize && actionType[j] == NOT) {
            nextFilterResponse.flip(0, ctx.reader().maxDoc());
            j++;
        }

        switch (action) {

        case AND:
            bits.and(nextFilterResponse);
            break;
        case OR:
            bits.or(nextFilterResponse);
            break;
        case XOR:
            bits.xor(nextFilterResponse);
            break;
        default:
            bits.or(nextFilterResponse);
            break;

        }

    }
    // invalidate deleted document
    return invalidateDeletedDocument(bits, b);
}

---