public UnionDocsAndPositionsEnum(IndexReader indexReader, Term[] terms) throws IOException {
List<DocsAndPositionsEnum> docsEnums = new LinkedList<DocsAndPositionsEnum>();
final Bits delDocs = indexReader.getDeletedDocs();
for (int i = 0; i < terms.length; i++) {
DocsAndPositionsEnum postings =
indexReader.termPositionsEnum(delDocs, terms[i].field(), terms[i].bytes());
if (postings != null) {
docsEnums.add(postings);
} else {
if (indexReader.termDocsEnum(delDocs, terms[i].field(), terms[i].bytes()) != null) {
// term does exist, but has no positions
throw new IllegalStateException(
"field \""
+ terms[i].field()
+ "\" was indexed with Field.omitTermFreqAndPositions=true; cannot run PhraseQuery (term="
+ terms[i].text()
+ ")");
}
}
}
_queue = new DocsQueue(docsEnums);
_posList = new IntQueue();
}
@Override
public Scorer scorer(AtomicReaderContext context, ScorerContext scorerContext)
throws IOException {
if (termArrays.size() == 0) // optimize zero-term case
return null;
final IndexReader reader = context.reader;
final Bits delDocs = reader.getDeletedDocs();
PhraseQuery.PostingsAndFreq[] postingsFreqs =
new PhraseQuery.PostingsAndFreq[termArrays.size()];
for (int pos = 0; pos < postingsFreqs.length; pos++) {
Term[] terms = termArrays.get(pos);
final DocsAndPositionsEnum postingsEnum;
int docFreq;
if (terms.length > 1) {
postingsEnum = new UnionDocsAndPositionsEnum(reader, terms);
// coarse -- this overcounts since a given doc can
// have more than one terms:
docFreq = 0;
for (int termIdx = 0; termIdx < terms.length; termIdx++) {
docFreq += reader.docFreq(terms[termIdx]);
}
} else {
final Term term = terms[0];
postingsEnum = reader.termPositionsEnum(delDocs, term.field(), term.bytes());
if (postingsEnum == null) {
if (reader.termDocsEnum(delDocs, term.field(), term.bytes()) != null) {
// term does exist, but has no positions
throw new IllegalStateException(
"field \""
+ term.field()
+ "\" was indexed with Field.omitTermFreqAndPositions=true; cannot run PhraseQuery (term="
+ term.text()
+ ")");
} else {
// term does not exist
return null;
}
}
docFreq = reader.docFreq(term.field(), term.bytes());
}
postingsFreqs[pos] =
new PhraseQuery.PostingsAndFreq(postingsEnum, docFreq, positions.get(pos).intValue());
}
// sort by increasing docFreq order
if (slop == 0) {
ArrayUtil.quickSort(postingsFreqs);
}
if (slop == 0) {
ExactPhraseScorer s =
new ExactPhraseScorer(this, postingsFreqs, similarity, reader.norms(field));
if (s.noDocs) {
return null;
} else {
return s;
}
} else {
return new SloppyPhraseScorer(this, postingsFreqs, similarity, slop, reader.norms(field));
}
}