| Code with Finding: |
class BooleanQuery.BooleanWeight {
public Scorer scorer(IndexReader reader, boolean scoreDocsInOrder, boolean topScorer)
throws IOException {
List required = new ArrayList();
List prohibited = new ArrayList();
List optional = new ArrayList();
for (Iterator wIter = weights.iterator(), cIter = clauses.iterator(); wIter.hasNext();) {
Weight w = (Weight) wIter.next();
BooleanClause c = (BooleanClause) cIter.next();
Scorer subScorer = w.scorer(reader, true, false);
if (subScorer == null) {
if (c.isRequired()) {
return null;
}
} else if (c.isRequired()) {
required.add(subScorer);
} else if (c.isProhibited()) {
prohibited.add(subScorer);
} else {
optional.add(subScorer);
}
}
// Check if we can return a BooleanScorer
scoreDocsInOrder |= !allowDocsOutOfOrder; // until it is removed, factor in the static setting.
if (!scoreDocsInOrder && topScorer && required.size() == 0 && prohibited.size() < 32) {
return new BooleanScorer(similarity, minNrShouldMatch, optional, prohibited);
}
if (required.size() == 0 && optional.size() == 0) {
// no required and optional clauses.
return null;
} else if (optional.size() < minNrShouldMatch) {
// either >1 req scorer, or there are 0 req scorers and at least 1
// optional scorer. Therefore if there are not enough optional scorers
// no documents will be matched by the query
return null;
}
// Return a BooleanScorer2
return new BooleanScorer2(similarity, minNrShouldMatch, required, prohibited, optional);
}
}
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