| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.lucene.search; |
| |
| import java.io.IOException; |
| import java.util.Collection; |
| import org.apache.lucene.document.Document; |
| import org.apache.lucene.document.Field; |
| import org.apache.lucene.index.IndexReader; |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.index.Term; |
| import org.apache.lucene.search.similarities.ClassicSimilarity; |
| import org.apache.lucene.store.Directory; |
| import org.apache.lucene.tests.analysis.MockAnalyzer; |
| import org.apache.lucene.tests.index.RandomIndexWriter; |
| import org.apache.lucene.tests.util.LuceneTestCase; |
| |
| /** Similarity unit test. */ |
| public class TestSimilarity extends LuceneTestCase { |
| |
| public static class SimpleSimilarity extends ClassicSimilarity { |
| @Override |
| public float lengthNorm(int length) { |
| return 1; |
| } |
| |
| @Override |
| public float tf(float freq) { |
| return freq; |
| } |
| |
| @Override |
| public float idf(long docFreq, long docCount) { |
| return 1.0f; |
| } |
| |
| @Override |
| public Explanation idfExplain(CollectionStatistics collectionStats, TermStatistics[] stats) { |
| return Explanation.match(1.0f, "Inexplicable"); |
| } |
| } |
| |
| public void testSimilarity() throws Exception { |
| Directory store = newDirectory(); |
| RandomIndexWriter writer = |
| new RandomIndexWriter( |
| random(), |
| store, |
| newIndexWriterConfig(new MockAnalyzer(random())).setSimilarity(new SimpleSimilarity())); |
| |
| Document d1 = new Document(); |
| d1.add(newTextField("field", "a c", Field.Store.YES)); |
| |
| Document d2 = new Document(); |
| d2.add(newTextField("field", "a c b", Field.Store.YES)); |
| |
| writer.addDocument(d1); |
| writer.addDocument(d2); |
| IndexReader reader = writer.getReader(); |
| writer.close(); |
| |
| IndexSearcher searcher = newSearcher(reader); |
| searcher.setSimilarity(new SimpleSimilarity()); |
| |
| Term a = new Term("field", "a"); |
| Term b = new Term("field", "b"); |
| Term c = new Term("field", "c"); |
| |
| assertScore(searcher, new TermQuery(b), 1.0f); |
| |
| BooleanQuery.Builder bq = new BooleanQuery.Builder(); |
| bq.add(new TermQuery(a), BooleanClause.Occur.SHOULD); |
| bq.add(new TermQuery(b), BooleanClause.Occur.SHOULD); |
| // System.out.println(bq.toString("field")); |
| searcher.search( |
| bq.build(), |
| new CollectorManager<SimpleCollector, Void>() { |
| @Override |
| public SimpleCollector newCollector() { |
| return new ScoreAssertingCollector() { |
| private int base = 0; |
| |
| @Override |
| public void collect(int doc) throws IOException { |
| // System.out.println("Doc=" + doc + " score=" + score); |
| assertEquals((float) doc + base + 1, scorer.score(), 0); |
| } |
| |
| @Override |
| protected void doSetNextReader(LeafReaderContext context) { |
| base = context.docBase; |
| } |
| }; |
| } |
| |
| @Override |
| public Void reduce(Collection<SimpleCollector> collectors) { |
| return null; |
| } |
| }); |
| |
| PhraseQuery pq = new PhraseQuery(a.field(), a.bytes(), c.bytes()); |
| // System.out.println(pq.toString("field")); |
| assertScore(searcher, pq, 1.0f); |
| |
| pq = new PhraseQuery(2, a.field(), a.bytes(), b.bytes()); |
| // System.out.println(pq.toString("field")); |
| assertScore(searcher, pq, 0.5f); |
| |
| reader.close(); |
| store.close(); |
| } |
| |
| private static void assertScore(IndexSearcher searcher, Query query, float score) |
| throws IOException { |
| searcher.search( |
| query, |
| new CollectorManager<SimpleCollector, Void>() { |
| @Override |
| public SimpleCollector newCollector() { |
| return new ScoreAssertingCollector() { |
| @Override |
| public final void collect(int doc) throws IOException { |
| // System.out.println("Doc=" + doc + " score=" + score); |
| assertEquals(score, scorer.score(), 0); |
| } |
| }; |
| } |
| |
| @Override |
| public Void reduce(Collection<SimpleCollector> collectors) { |
| return null; |
| } |
| }); |
| } |
| |
| private abstract static class ScoreAssertingCollector extends SimpleCollector { |
| Scorable scorer; |
| |
| @Override |
| public final void setScorer(Scorable scorer) { |
| this.scorer = scorer; |
| } |
| |
| @Override |
| public final ScoreMode scoreMode() { |
| return ScoreMode.COMPLETE; |
| } |
| } |
| } |