1 package org.apache.lucene.index;
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20 import java.io.IOException;
22 import org.apache.lucene.util.LuceneTestCase;
23 import org.apache.lucene.analysis.MockAnalyzer;
24 import org.apache.lucene.document.Document;
25 import org.apache.lucene.document.Field;
26 import org.apache.lucene.index.IndexWriterConfig.OpenMode;
27 import org.apache.lucene.store.Directory;
30 public class TestSegmentTermEnum extends LuceneTestCase {
35 public void setUp() throws Exception {
41 public void tearDown() throws Exception {
46 public void testTermEnum() throws IOException {
47 IndexWriter writer = null;
49 writer = new IndexWriter(dir, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
51 // ADD 100 documents with term : aaa
52 // add 100 documents with terms: aaa bbb
53 // Therefore, term 'aaa' has document frequency of 200 and term 'bbb' 100
54 for (int i = 0; i < 100; i++) {
55 addDoc(writer, "aaa");
56 addDoc(writer, "aaa bbb");
61 // verify document frequency of terms in an unoptimized index
64 // merge segments by optimizing the index
65 writer = new IndexWriter(dir, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)).setOpenMode(OpenMode.APPEND));
69 // verify document frequency of terms in an optimized index
73 public void testPrevTermAtEnd() throws IOException
75 IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)));
76 addDoc(writer, "aaa bbb");
78 SegmentReader reader = SegmentReader.getOnlySegmentReader(dir);
79 SegmentTermEnum termEnum = (SegmentTermEnum) reader.terms();
80 assertTrue(termEnum.next());
81 assertEquals("aaa", termEnum.term().text());
82 assertTrue(termEnum.next());
83 assertEquals("aaa", termEnum.prev().text());
84 assertEquals("bbb", termEnum.term().text());
85 assertFalse(termEnum.next());
86 assertEquals("bbb", termEnum.prev().text());
90 private void verifyDocFreq()
93 IndexReader reader = IndexReader.open(dir, true);
94 TermEnum termEnum = null;
96 // create enumeration of all terms
97 termEnum = reader.terms();
98 // go to the first term (aaa)
100 // assert that term is 'aaa'
101 assertEquals("aaa", termEnum.term().text());
102 assertEquals(200, termEnum.docFreq());
103 // go to the second term (bbb)
105 // assert that term is 'bbb'
106 assertEquals("bbb", termEnum.term().text());
107 assertEquals(100, termEnum.docFreq());
112 // create enumeration of terms after term 'aaa', including 'aaa'
113 termEnum = reader.terms(new Term("content", "aaa"));
114 // assert that term is 'aaa'
115 assertEquals("aaa", termEnum.term().text());
116 assertEquals(200, termEnum.docFreq());
119 // assert that term is 'bbb'
120 assertEquals("bbb", termEnum.term().text());
121 assertEquals(100, termEnum.docFreq());
126 private void addDoc(IndexWriter writer, String value) throws IOException
128 Document doc = new Document();
129 doc.add(newField("content", value, Field.Store.NO, Field.Index.ANALYZED));
130 writer.addDocument(doc);