--- /dev/null
+package org.apache.lucene.search.similar;
+
+/**
+ * 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.
+ */
+
+import java.io.IOException;
+import java.io.StringReader;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.lucene.analysis.MockAnalyzer;
+import org.apache.lucene.analysis.MockTokenizer;
+import org.apache.lucene.document.Document;
+import org.apache.lucene.document.Field;
+import org.apache.lucene.index.IndexReader;
+import org.apache.lucene.index.RandomIndexWriter;
+import org.apache.lucene.search.BooleanClause;
+import org.apache.lucene.search.BooleanQuery;
+import org.apache.lucene.search.IndexSearcher;
+import org.apache.lucene.search.TermQuery;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.util.LuceneTestCase;
+
+public class TestMoreLikeThis extends LuceneTestCase {
+ private Directory directory;
+ private IndexReader reader;
+ private IndexSearcher searcher;
+
+ @Override
+ public void setUp() throws Exception {
+ super.setUp();
+ directory = newDirectory();
+ RandomIndexWriter writer = new RandomIndexWriter(random, directory);
+
+ // Add series of docs with specific information for MoreLikeThis
+ addDoc(writer, "lucene");
+ addDoc(writer, "lucene release");
+
+ reader = writer.getReader();
+ writer.close();
+ searcher = newSearcher(reader);
+ }
+
+ @Override
+ public void tearDown() throws Exception {
+ reader.close();
+ searcher.close();
+ directory.close();
+ super.tearDown();
+ }
+
+ private void addDoc(RandomIndexWriter writer, String text) throws IOException {
+ Document doc = new Document();
+ doc.add(newField("text", text, Field.Store.YES, Field.Index.ANALYZED));
+ writer.addDocument(doc);
+ }
+
+ public void testBoostFactor() throws Throwable {
+ Map<String,Float> originalValues = getOriginalValues();
+
+ MoreLikeThis mlt = new MoreLikeThis(reader);
+ mlt.setAnalyzer(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false));
+ 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(new StringReader(
+ "lucene release"), "text");
+ List<BooleanClause> clauses = query.clauses();
+
+ assertEquals("Expected " + originalValues.size() + " clauses.",
+ originalValues.size(), clauses.size());
+
+ for (int i = 0; i < clauses.size(); i++) {
+ BooleanClause clause = clauses.get(i);
+ TermQuery tq = (TermQuery) clause.getQuery();
+ Float termBoost = originalValues.get(tq.getTerm().text());
+ assertNotNull("Expected term " + tq.getTerm().text(), termBoost);
+
+ float totalBoost = termBoost.floatValue() * boostFactor;
+ assertEquals("Expected boost of " + totalBoost + " for term '"
+ + tq.getTerm().text() + "' got " + tq.getBoost(), totalBoost, tq
+ .getBoost(), 0.0001);
+ }
+ }
+
+ private Map<String,Float> getOriginalValues() throws IOException {
+ Map<String,Float> originalValues = new HashMap<String,Float>();
+ MoreLikeThis mlt = new MoreLikeThis(reader);
+ mlt.setAnalyzer(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false));
+ mlt.setMinDocFreq(1);
+ mlt.setMinTermFreq(1);
+ mlt.setMinWordLen(1);
+ mlt.setFieldNames(new String[] {"text"});
+ mlt.setBoost(true);
+ BooleanQuery query = (BooleanQuery) mlt.like(new StringReader(
+ "lucene release"), "text");
+ List<BooleanClause> clauses = query.clauses();
+
+ for (int i = 0; i < clauses.size(); i++) {
+ BooleanClause clause = clauses.get(i);
+ TermQuery tq = (TermQuery) clause.getQuery();
+ originalValues.put(tq.getTerm().text(), Float.valueOf(tq.getBoost()));
+ }
+ return originalValues;
+ }
+
+ // LUCENE-3326
+ public void testMultiFields() throws Exception {
+ MoreLikeThis mlt = new MoreLikeThis(reader);
+ mlt.setAnalyzer(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false));
+ mlt.setMinDocFreq(1);
+ mlt.setMinTermFreq(1);
+ mlt.setMinWordLen(1);
+ mlt.setFieldNames(new String[] {"text", "foobar"});
+ mlt.like(new StringReader("this is a test"), "foobar");
+ }
+
+ // LUCENE-3326
+ @Deprecated
+ public void testMultiFieldsDeprecated() throws Exception {
+ MoreLikeThis mlt = new MoreLikeThis(reader);
+ mlt.setAnalyzer(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false));
+ mlt.setMinDocFreq(1);
+ mlt.setMinTermFreq(1);
+ mlt.setMinWordLen(1);
+ mlt.setFieldNames(new String[] {"text", "foobar"});
+ mlt.like(new StringReader("this is a test"));
+ }
+}