@Test
public void testGetThatFieldProbabilityRatioIsReflectedInBoost() throws Exception {
ArgumentCaptor<Float> normalizeCaptor = ArgumentCaptor.forClass(Float.class);
DocumentFrequencyCorrection dfc = new DocumentFrequencyCorrection();
Directory directory = newDirectory();
Analyzer analyzer =
new Analyzer() {
protected TokenStreamComponents createComponents(String fieldName) {
Tokenizer source = new WhitespaceTokenizer();
TokenStream filter =
new WordDelimiterFilter(
source,
WordDelimiterFilter.GENERATE_WORD_PARTS
| WordDelimiterFilter.SPLIT_ON_CASE_CHANGE,
null);
filter = new LowerCaseFilter(filter);
return new TokenStreamComponents(source, filter);
}
};
IndexWriterConfig conf = new IndexWriterConfig(analyzer);
conf.setCodec(Codec.forName(TestUtil.LUCENE_CODEC));
IndexWriter indexWriter = new IndexWriter(directory, conf);
// Both fields f1 and f2 have 10 terms in total.
// f1: the search terms (abc def) make 100% of all terms in f1
// f2: the search terms (abc def) make 50% of all terms in f2
// --> we expect that the sum of the boost factors for terms in bq(+f1:abc, +f1:def)
// equals 2 * sum of the boost factors for terms in bq(+f2:abc, +f2:def)
PRMSFieldBoostTest.addNumDocs("f1", "abc def", indexWriter, 2);
PRMSFieldBoostTest.addNumDocs("f1", "abc", indexWriter, 4);
PRMSFieldBoostTest.addNumDocs("f1", "def", indexWriter, 2);
PRMSFieldBoostTest.addNumDocs("f2", "abc def", indexWriter, 1);
PRMSFieldBoostTest.addNumDocs("f2", "abc", indexWriter, 2);
PRMSFieldBoostTest.addNumDocs("f2", "def", indexWriter, 1);
PRMSFieldBoostTest.addNumDocs("f2", "ghi", indexWriter, 5);
indexWriter.close();
IndexReader indexReader = DirectoryReader.open(directory);
IndexSearcher indexSearcher = new IndexSearcher(indexReader);
indexSearcher.setSimilarity(similarity);
Map<String, Float> fields = new HashMap<>();
fields.put("f1", 1f);
fields.put("f2", 1f);
SearchFieldsAndBoosting searchFieldsAndBoosting =
new SearchFieldsAndBoosting(FieldBoostModel.PRMS, fields, fields, 0.8f);
LuceneQueryBuilder queryBuilder =
new LuceneQueryBuilder(dfc, analyzer, searchFieldsAndBoosting, 0.01f, null);
WhiteSpaceQuerqyParser parser = new WhiteSpaceQuerqyParser();
Query query = queryBuilder.createQuery(parser.parse("AbcDef"));
dfc.finishedUserQuery();
assertTrue(query instanceof DisjunctionMaxQuery);
DisjunctionMaxQuery dmq = (DisjunctionMaxQuery) query;
List<Query> disjuncts = dmq.getDisjuncts();
assertEquals(2, disjuncts.size());
Query disjunct1 = disjuncts.get(0);
if (disjunct1 instanceof BoostQuery) {
disjunct1 = ((BoostQuery) disjunct1).getQuery();
}
assertTrue(disjunct1 instanceof BooleanQuery);
BooleanQuery bq1 = (BooleanQuery) disjunct1;
Query disjunct2 = disjuncts.get(1);
if (disjunct2 instanceof BoostQuery) {
disjunct2 = ((BoostQuery) disjunct2).getQuery();
}
assertTrue(disjunct2 instanceof BooleanQuery);
BooleanQuery bq2 = (BooleanQuery) disjunct2;
final Weight weight1 = bq1.createWeight(indexSearcher, true);
weight1.normalize(0.1f, 4f);
final Weight weight2 = bq2.createWeight(indexSearcher, true);
weight2.normalize(0.1f, 4f);
Mockito.verify(simWeight, times(4)).normalize(eq(0.1f), normalizeCaptor.capture());
final List<Float> capturedBoosts = normalizeCaptor.getAllValues();
// capturedBoosts = boosts of [bq1.term1, bq1.term2, bq2.term1, bq2.term2 ]
assertEquals(capturedBoosts.get(0), capturedBoosts.get(1), 0.00001);
assertEquals(capturedBoosts.get(2), capturedBoosts.get(3), 0.00001);
assertEquals(2f, capturedBoosts.get(0) / capturedBoosts.get(3), 0.00001);
indexReader.close();
directory.close();
analyzer.close();
}