public void testBoostFactor() throws Throwable {
Map<String, Float> originalValues = getOriginalValues();
MoreLikeThis mlt = new MoreLikeThis(reader);
Analyzer analyzer = new MockAnalyzer(random(), MockTokenizer.WHITESPACE, false);
mlt.setAnalyzer(analyzer);
mlt.setMinDocFreq(1);
mlt.setMinTermFreq(1);
mlt.setMinWordLen(1);
mlt.setFieldNames(new String[] {"text"});
mlt.setBoost(true);
// this mean that every term boost factor will be multiplied by this
// number
float boostFactor = 5;
mlt.setBoostFactor(boostFactor);
BooleanQuery query = (BooleanQuery) mlt.like("text", new StringReader("lucene release"));
Collection<BooleanClause> clauses = query.clauses();
assertEquals(
"Expected " + originalValues.size() + " clauses.", originalValues.size(), clauses.size());
for (BooleanClause clause : clauses) {
BoostQuery bq = (BoostQuery) clause.getQuery();
TermQuery tq = (TermQuery) bq.getQuery();
Float termBoost = originalValues.get(tq.getTerm().text());
assertNotNull("Expected term " + tq.getTerm().text(), termBoost);
float totalBoost = termBoost * boostFactor;
assertEquals(
"Expected boost of "
+ totalBoost
+ " for term '"
+ tq.getTerm().text()
+ "' got "
+ bq.getBoost(),
totalBoost,
bq.getBoost(),
0.0001);
}
analyzer.close();
}
