Example usage for org.apache.lucene.search.spans Spans positionsCost

Introduction

In this page you can find the example usage for org.apache.lucene.search.spans Spans positionsCost.

Prototype

public abstract float positionsCost();

Source Link

Document

Return an estimation of the cost of using the positions of this Spans for any single document, but only after #asTwoPhaseIterator returned null .

Usage

From source file:uk.co.flax.luwak.util.XConjunctionSpans.java

License:Apache License

/**
 * Return a {@link TwoPhaseIterator} view of this ConjunctionSpans.
 *///w  w w .  ja  va2  s.c o  m
@Override
public TwoPhaseIterator asTwoPhaseIterator() {
    float totalMatchCost = 0;
    // Compute the matchCost as the total matchCost/positionsCostant of the sub spans.
    for (Spans spans : subSpans) {
        TwoPhaseIterator tpi = spans.asTwoPhaseIterator();
        if (tpi != null) {
            totalMatchCost += tpi.matchCost();
        } else {
            totalMatchCost += spans.positionsCost();
        }
    }
    final float matchCost = totalMatchCost;

    return new TwoPhaseIterator(conjunction) {
        @Override
        public boolean matches() throws IOException {
            return twoPhaseCurrentDocMatches();
        }

        @Override
        public float matchCost() {
            return matchCost;
        }
    };
}

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