| package org.apache.lucene.index; |
| |
| /** |
| * 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 org.apache.lucene.util.LuceneTestCase; |
| import org.apache.lucene.analysis.MockAnalyzer; |
| import org.apache.lucene.document.Document; |
| import org.apache.lucene.document.Field; |
| import org.apache.lucene.index.IndexWriterConfig.OpenMode; |
| import org.apache.lucene.store.Directory; |
| |
| |
| public class TestSegmentTermEnum extends LuceneTestCase { |
| |
| Directory dir; |
| |
| @Override |
| public void setUp() throws Exception { |
| super.setUp(); |
| dir = newDirectory(); |
| } |
| |
| @Override |
| public void tearDown() throws Exception { |
| dir.close(); |
| super.tearDown(); |
| } |
| |
| public void testTermEnum() throws IOException { |
| IndexWriter writer = null; |
| |
| writer = new IndexWriter(dir, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random))); |
| |
| // ADD 100 documents with term : aaa |
| // add 100 documents with terms: aaa bbb |
| // Therefore, term 'aaa' has document frequency of 200 and term 'bbb' 100 |
| for (int i = 0; i < 100; i++) { |
| addDoc(writer, "aaa"); |
| addDoc(writer, "aaa bbb"); |
| } |
| |
| writer.close(); |
| |
| // verify document frequency of terms in an unoptimized index |
| verifyDocFreq(); |
| |
| // merge segments by optimizing the index |
| writer = new IndexWriter(dir, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)).setOpenMode(OpenMode.APPEND)); |
| writer.optimize(); |
| writer.close(); |
| |
| // verify document frequency of terms in an optimized index |
| verifyDocFreq(); |
| } |
| |
| public void testPrevTermAtEnd() throws IOException |
| { |
| IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random))); |
| addDoc(writer, "aaa bbb"); |
| writer.close(); |
| SegmentReader reader = SegmentReader.getOnlySegmentReader(dir); |
| SegmentTermEnum termEnum = (SegmentTermEnum) reader.terms(); |
| assertTrue(termEnum.next()); |
| assertEquals("aaa", termEnum.term().text()); |
| assertTrue(termEnum.next()); |
| assertEquals("aaa", termEnum.prev().text()); |
| assertEquals("bbb", termEnum.term().text()); |
| assertFalse(termEnum.next()); |
| assertEquals("bbb", termEnum.prev().text()); |
| reader.close(); |
| } |
| |
| private void verifyDocFreq() |
| throws IOException |
| { |
| IndexReader reader = IndexReader.open(dir, true); |
| TermEnum termEnum = null; |
| |
| // create enumeration of all terms |
| termEnum = reader.terms(); |
| // go to the first term (aaa) |
| termEnum.next(); |
| // assert that term is 'aaa' |
| assertEquals("aaa", termEnum.term().text()); |
| assertEquals(200, termEnum.docFreq()); |
| // go to the second term (bbb) |
| termEnum.next(); |
| // assert that term is 'bbb' |
| assertEquals("bbb", termEnum.term().text()); |
| assertEquals(100, termEnum.docFreq()); |
| |
| termEnum.close(); |
| |
| |
| // create enumeration of terms after term 'aaa', including 'aaa' |
| termEnum = reader.terms(new Term("content", "aaa")); |
| // assert that term is 'aaa' |
| assertEquals("aaa", termEnum.term().text()); |
| assertEquals(200, termEnum.docFreq()); |
| // go to term 'bbb' |
| termEnum.next(); |
| // assert that term is 'bbb' |
| assertEquals("bbb", termEnum.term().text()); |
| assertEquals(100, termEnum.docFreq()); |
| termEnum.close(); |
| reader.close(); |
| } |
| |
| private void addDoc(IndexWriter writer, String value) throws IOException |
| { |
| Document doc = new Document(); |
| doc.add(newField("content", value, Field.Store.NO, Field.Index.ANALYZED)); |
| writer.addDocument(doc); |
| } |
| } |