public Query createPhrasePrefixQuery(
String field, String queryText, int phraseSlop, int maxExpansions) {
final Query query =
createFieldQuery(getAnalyzer(), Occur.MUST, field, queryText, true, phraseSlop);
final MultiPhrasePrefixQuery prefixQuery = new MultiPhrasePrefixQuery();
prefixQuery.setMaxExpansions(maxExpansions);
prefixQuery.setSlop(phraseSlop);
if (query instanceof PhraseQuery) {
PhraseQuery pq = (PhraseQuery) query;
Term[] terms = pq.getTerms();
int[] positions = pq.getPositions();
for (int i = 0; i < terms.length; i++) {
prefixQuery.add(new Term[] {terms[i]}, positions[i]);
}
return prefixQuery;
} else if (query instanceof MultiPhraseQuery) {
MultiPhraseQuery pq = (MultiPhraseQuery) query;
Term[][] terms = pq.getTermArrays();
int[] positions = pq.getPositions();
for (int i = 0; i < terms.length; i++) {
prefixQuery.add(terms[i], positions[i]);
}
return prefixQuery;
} else if (query instanceof TermQuery) {
prefixQuery.add(((TermQuery) query).getTerm());
return prefixQuery;
}
return query;
}
/**
* Add multiple terms at the next position in the phrase. Any of the terms may match.
*
* @see org.apache.lucene.search.PhraseQuery.Builder#add(Term)
*/
public void add(Term[] terms) {
int position = 0;
if (positions.size() > 0) position = positions.get(positions.size() - 1) + 1;
add(terms, position);
}
/**
* Add a single term at the next position in the phrase.
*
* @see org.apache.lucene.search.PhraseQuery.Builder#add(Term)
*/
public void add(Term term) {
add(new Term[] {term});
}