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;
}