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 java.util.*;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.IntField;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.search.FieldCache;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.LineFileDocs;
import org.apache.lucene.util.LuceneTestCase.SuppressCodecs;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util._TestUtil;
import org.apache.lucene.util.automaton.Automaton;
import org.apache.lucene.util.automaton.BasicAutomata;
import org.apache.lucene.util.automaton.CompiledAutomaton;
import org.apache.lucene.util.automaton.RegExp;
@SuppressCodecs({ "SimpleText", "Memory", "Direct" })
public class TestTermsEnum extends LuceneTestCase {
public void test() throws Exception {
Random random = new Random(random().nextLong());
final LineFileDocs docs = new LineFileDocs(random, defaultCodecSupportsDocValues());
final Directory d = newDirectory();
final RandomIndexWriter w = new RandomIndexWriter(random(), d);
final int numDocs = atLeast(10);
for(int docCount=0;docCount<numDocs;docCount++) {
w.addDocument(docs.nextDoc());
}
final IndexReader r = w.getReader();
w.close();
final List<BytesRef> terms = new ArrayList<BytesRef>();
final TermsEnum termsEnum = MultiFields.getTerms(r, "body").iterator(null);
BytesRef term;
while((term = termsEnum.next()) != null) {
terms.add(BytesRef.deepCopyOf(term));
}
if (VERBOSE) {
System.out.println("TEST: " + terms.size() + " terms");
}
int upto = -1;
final int iters = atLeast(200);
for(int iter=0;iter<iters;iter++) {
final boolean isEnd;
if (upto != -1 && random().nextBoolean()) {
// next
if (VERBOSE) {
System.out.println("TEST: iter next");
}
isEnd = termsEnum.next() == null;
upto++;
if (isEnd) {
if (VERBOSE) {
System.out.println(" end");
}
assertEquals(upto, terms.size());
upto = -1;
} else {
if (VERBOSE) {
System.out.println(" got term=" + termsEnum.term().utf8ToString() + " expected=" + terms.get(upto).utf8ToString());
}
assertTrue(upto < terms.size());
assertEquals(terms.get(upto), termsEnum.term());
}
} else {
final BytesRef target;
final String exists;
if (random().nextBoolean()) {
// likely fake term
if (random().nextBoolean()) {
target = new BytesRef(_TestUtil.randomSimpleString(random()));
} else {
target = new BytesRef(_TestUtil.randomRealisticUnicodeString(random()));
}
exists = "likely not";
} else {
// real term
target = terms.get(random().nextInt(terms.size()));
exists = "yes";
}
upto = Collections.binarySearch(terms, target);
if (random().nextBoolean()) {
if (VERBOSE) {
System.out.println("TEST: iter seekCeil target=" + target.utf8ToString() + " exists=" + exists);
}
// seekCeil
final TermsEnum.SeekStatus status = termsEnum.seekCeil(target);
if (VERBOSE) {
System.out.println(" got " + status);
}
if (upto < 0) {
upto = -(upto+1);
if (upto >= terms.size()) {
assertEquals(TermsEnum.SeekStatus.END, status);
upto = -1;
} else {
assertEquals(TermsEnum.SeekStatus.NOT_FOUND, status);
assertEquals(terms.get(upto), termsEnum.term());
}
} else {
assertEquals(TermsEnum.SeekStatus.FOUND, status);
assertEquals(terms.get(upto), termsEnum.term());
}
} else {
if (VERBOSE) {
System.out.println("TEST: iter seekExact target=" + target.utf8ToString() + " exists=" + exists);
}
// seekExact
final boolean result = termsEnum.seekExact(target);
if (VERBOSE) {
System.out.println(" got " + result);
}
if (upto < 0) {
assertFalse(result);
upto = -1;
} else {
assertTrue(result);
assertEquals(target, termsEnum.term());
}
}
}
}
r.close();
d.close();
docs.close();
}
private void addDoc(RandomIndexWriter w, Collection<String> terms, Map<BytesRef,Integer> termToID, int id) throws IOException {
Document doc = new Document();
doc.add(new IntField("id", id, Field.Store.NO));
if (VERBOSE) {
System.out.println("TEST: addDoc id:" + id + " terms=" + terms);
}
for (String s2 : terms) {
doc.add(newStringField("f", s2, Field.Store.NO));
termToID.put(new BytesRef(s2), id);
}
w.addDocument(doc);
terms.clear();
}
private boolean accepts(CompiledAutomaton c, BytesRef b) {
int state = c.runAutomaton.getInitialState();
for(int idx=0;idx<b.length;idx++) {
assertTrue(state != -1);
state = c.runAutomaton.step(state, b.bytes[b.offset+idx] & 0xff);
}
return c.runAutomaton.isAccept(state);
}
// Tests Terms.intersect
public void testIntersectRandom() throws IOException {
final Directory dir = newDirectory();
final RandomIndexWriter w = new RandomIndexWriter(random(), dir);
final int numTerms = atLeast(300);
//final int numTerms = 50;
final Set<String> terms = new HashSet<String>();
final Collection<String> pendingTerms = new ArrayList<String>();
final Map<BytesRef,Integer> termToID = new HashMap<BytesRef,Integer>();
int id = 0;
while(terms.size() != numTerms) {
final String s = getRandomString();
if (!terms.contains(s)) {
terms.add(s);
pendingTerms.add(s);
if (random().nextInt(20) == 7) {
addDoc(w, pendingTerms, termToID, id++);
}
}
}
addDoc(w, pendingTerms, termToID, id++);
final BytesRef[] termsArray = new BytesRef[terms.size()];
final Set<BytesRef> termsSet = new HashSet<BytesRef>();
{
int upto = 0;
for(String s : terms) {
final BytesRef b = new BytesRef(s);
termsArray[upto++] = b;
termsSet.add(b);
}
Arrays.sort(termsArray);
}
if (VERBOSE) {
System.out.println("\nTEST: indexed terms (unicode order):");
for(BytesRef t : termsArray) {
System.out.println(" " + t.utf8ToString() + " -> id:" + termToID.get(t));
}
}
final IndexReader r = w.getReader();
w.close();
// NOTE: intentional insanity!!
final FieldCache.Ints docIDToID = FieldCache.DEFAULT.getInts(SlowCompositeReaderWrapper.wrap(r), "id", false);
for(int iter=0;iter<10*RANDOM_MULTIPLIER;iter++) {
// TODO: can we also test infinite As here...?
// From the random terms, pick some ratio and compile an
// automaton:
final Set<String> acceptTerms = new HashSet<String>();
final TreeSet<BytesRef> sortedAcceptTerms = new TreeSet<BytesRef>();
final double keepPct = random().nextDouble();
Automaton a;
if (iter == 0) {
if (VERBOSE) {
System.out.println("\nTEST: empty automaton");
}
a = BasicAutomata.makeEmpty();
} else {
if (VERBOSE) {
System.out.println("\nTEST: keepPct=" + keepPct);
}
for (String s : terms) {
final String s2;
if (random().nextDouble() <= keepPct) {
s2 = s;
} else {
s2 = getRandomString();
}
acceptTerms.add(s2);
sortedAcceptTerms.add(new BytesRef(s2));
}
a = BasicAutomata.makeStringUnion(sortedAcceptTerms);
}
if (random().nextBoolean()) {
if (VERBOSE) {
System.out.println("TEST: reduce the automaton");
}
a.reduce();
}
final CompiledAutomaton c = new CompiledAutomaton(a, true, false);
final BytesRef[] acceptTermsArray = new BytesRef[acceptTerms.size()];
final Set<BytesRef> acceptTermsSet = new HashSet<BytesRef>();
int upto = 0;
for(String s : acceptTerms) {
final BytesRef b = new BytesRef(s);
acceptTermsArray[upto++] = b;
acceptTermsSet.add(b);
assertTrue(accepts(c, b));
}
Arrays.sort(acceptTermsArray);
if (VERBOSE) {
System.out.println("\nTEST: accept terms (unicode order):");
for(BytesRef t : acceptTermsArray) {
System.out.println(" " + t.utf8ToString() + (termsSet.contains(t) ? " (exists)" : ""));
}
System.out.println(a.toDot());
}
for(int iter2=0;iter2<100;iter2++) {
final BytesRef startTerm = acceptTermsArray.length == 0 || random().nextBoolean() ? null : acceptTermsArray[random().nextInt(acceptTermsArray.length)];
if (VERBOSE) {
System.out.println("\nTEST: iter2=" + iter2 + " startTerm=" + (startTerm == null ? "<null>" : startTerm.utf8ToString()));
if (startTerm != null) {
int state = c.runAutomaton.getInitialState();
for(int idx=0;idx<startTerm.length;idx++) {
final int label = startTerm.bytes[startTerm.offset+idx] & 0xff;
System.out.println(" state=" + state + " label=" + label);
state = c.runAutomaton.step(state, label);
assertTrue(state != -1);
}
System.out.println(" state=" + state);
}
}
final TermsEnum te = MultiFields.getTerms(r, "f").intersect(c, startTerm);
int loc;
if (startTerm == null) {
loc = 0;
} else {
loc = Arrays.binarySearch(termsArray, BytesRef.deepCopyOf(startTerm));
if (loc < 0) {
loc = -(loc+1);
} else {
// startTerm exists in index
loc++;
}
}
while(loc < termsArray.length && !acceptTermsSet.contains(termsArray[loc])) {
loc++;
}
DocsEnum docsEnum = null;
while (loc < termsArray.length) {
final BytesRef expected = termsArray[loc];
final BytesRef actual = te.next();
if (VERBOSE) {
System.out.println("TEST: next() expected=" + expected.utf8ToString() + " actual=" + (actual == null ? "null" : actual.utf8ToString()));
}
assertEquals(expected, actual);
assertEquals(1, te.docFreq());
docsEnum = _TestUtil.docs(random(), te, null, docsEnum, DocsEnum.FLAG_NONE);
final int docID = docsEnum.nextDoc();
assertTrue(docID != DocIdSetIterator.NO_MORE_DOCS);
assertEquals(docIDToID.get(docID), termToID.get(expected).intValue());
do {
loc++;
} while (loc < termsArray.length && !acceptTermsSet.contains(termsArray[loc]));
}
assertNull(te.next());
}
}
r.close();
dir.close();
}
private Directory d;
private IndexReader r;
private final String FIELD = "field";
private IndexReader makeIndex(String... terms) throws Exception {
d = newDirectory();
IndexWriterConfig iwc = newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()));
/*
iwc.setCodec(new StandardCodec(minTermsInBlock, maxTermsInBlock));
*/
final RandomIndexWriter w = new RandomIndexWriter(random(), d, iwc);
for(String term : terms) {
Document doc = new Document();
Field f = newStringField(FIELD, term, Field.Store.NO);
doc.add(f);
w.addDocument(doc);
}
if (r != null) {
close();
}
r = w.getReader();
w.close();
return r;
}
private void close() throws Exception {
r.close();
d.close();
}
private int docFreq(IndexReader r, String term) throws Exception {
return r.docFreq(new Term(FIELD, term));
}
public void testEasy() throws Exception {
// No floor arcs:
r = makeIndex("aa0", "aa1", "aa2", "aa3", "bb0", "bb1", "bb2", "bb3", "aa");
// First term in block:
assertEquals(1, docFreq(r, "aa0"));
// Scan forward to another term in same block
assertEquals(1, docFreq(r, "aa2"));
assertEquals(1, docFreq(r, "aa"));
// Reset same block then scan forwards
assertEquals(1, docFreq(r, "aa1"));
// Not found, in same block
assertEquals(0, docFreq(r, "aa5"));
// Found, in same block
assertEquals(1, docFreq(r, "aa2"));
// Not found in index:
assertEquals(0, docFreq(r, "b0"));
// Found:
assertEquals(1, docFreq(r, "aa2"));
// Found, rewind:
assertEquals(1, docFreq(r, "aa0"));
// First term in block:
assertEquals(1, docFreq(r, "bb0"));
// Scan forward to another term in same block
assertEquals(1, docFreq(r, "bb2"));
// Reset same block then scan forwards
assertEquals(1, docFreq(r, "bb1"));
// Not found, in same block
assertEquals(0, docFreq(r, "bb5"));
// Found, in same block
assertEquals(1, docFreq(r, "bb2"));
// Not found in index:
assertEquals(0, docFreq(r, "b0"));
// Found:
assertEquals(1, docFreq(r, "bb2"));
// Found, rewind:
assertEquals(1, docFreq(r, "bb0"));
close();
}
// tests:
// - test same prefix has non-floor block and floor block (ie, has 2 long outputs on same term prefix)
// - term that's entirely in the index
public void testFloorBlocks() throws Exception {
final String[] terms = new String[] {"aa0", "aa1", "aa2", "aa3", "aa4", "aa5", "aa6", "aa7", "aa8", "aa9", "aa", "xx"};
r = makeIndex(terms);
//r = makeIndex("aa0", "aa1", "aa2", "aa3", "aa4", "aa5", "aa6", "aa7", "aa8", "aa9");
// First term in first block:
assertEquals(1, docFreq(r, "aa0"));
assertEquals(1, docFreq(r, "aa4"));
// No block
assertEquals(0, docFreq(r, "bb0"));
// Second block
assertEquals(1, docFreq(r, "aa4"));
// Backwards to prior floor block:
assertEquals(1, docFreq(r, "aa0"));
// Forwards to last floor block:
assertEquals(1, docFreq(r, "aa9"));
assertEquals(0, docFreq(r, "a"));
assertEquals(1, docFreq(r, "aa"));
assertEquals(0, docFreq(r, "a"));
assertEquals(1, docFreq(r, "aa"));
// Forwards to last floor block:
assertEquals(1, docFreq(r, "xx"));
assertEquals(1, docFreq(r, "aa1"));
assertEquals(0, docFreq(r, "yy"));
assertEquals(1, docFreq(r, "xx"));
assertEquals(1, docFreq(r, "aa9"));
assertEquals(1, docFreq(r, "xx"));
assertEquals(1, docFreq(r, "aa4"));
final TermsEnum te = MultiFields.getTerms(r, FIELD).iterator(null);
while(te.next() != null) {
//System.out.println("TEST: next term=" + te.term().utf8ToString());
}
assertTrue(seekExact(te, "aa1"));
assertEquals("aa2", next(te));
assertTrue(seekExact(te, "aa8"));
assertEquals("aa9", next(te));
assertEquals("xx", next(te));
testRandomSeeks(r, terms);
close();
}
public void testZeroTerms() throws Exception {
d = newDirectory();
final RandomIndexWriter w = new RandomIndexWriter(random(), d);
Document doc = new Document();
doc.add(newTextField("field", "one two three", Field.Store.NO));
doc = new Document();
doc.add(newTextField("field2", "one two three", Field.Store.NO));
w.addDocument(doc);
w.commit();
w.deleteDocuments(new Term("field", "one"));
w.forceMerge(1);
IndexReader r = w.getReader();
w.close();
assertEquals(1, r.numDocs());
assertEquals(1, r.maxDoc());
Terms terms = MultiFields.getTerms(r, "field");
if (terms != null) {
assertNull(terms.iterator(null).next());
}
r.close();
d.close();
}
private String getRandomString() {
//return _TestUtil.randomSimpleString(random());
return _TestUtil.randomRealisticUnicodeString(random());
}
public void testRandomTerms() throws Exception {
final String[] terms = new String[_TestUtil.nextInt(random(), 1, atLeast(1000))];
final Set<String> seen = new HashSet<String>();
final boolean allowEmptyString = random().nextBoolean();
if (random().nextInt(10) == 7 && terms.length > 2) {
// Sometimes add a bunch of terms sharing a longish common prefix:
final int numTermsSamePrefix = random().nextInt(terms.length/2);
if (numTermsSamePrefix > 0) {
String prefix;
while(true) {
prefix = getRandomString();
if (prefix.length() < 5) {
continue;
} else {
break;
}
}
while(seen.size() < numTermsSamePrefix) {
final String t = prefix + getRandomString();
if (!seen.contains(t)) {
terms[seen.size()] = t;
seen.add(t);
}
}
}
}
while(seen.size() < terms.length) {
final String t = getRandomString();
if (!seen.contains(t) && (allowEmptyString || t.length() != 0)) {
terms[seen.size()] = t;
seen.add(t);
}
}
r = makeIndex(terms);
testRandomSeeks(r, terms);
close();
}
// sugar
private boolean seekExact(TermsEnum te, String term) throws IOException {
return te.seekExact(new BytesRef(term));
}
// sugar
private String next(TermsEnum te) throws IOException {
final BytesRef br = te.next();
if (br == null) {
return null;
} else {
return br.utf8ToString();
}
}
private BytesRef getNonExistTerm(BytesRef[] terms) {
BytesRef t = null;
while(true) {
final String ts = getRandomString();
t = new BytesRef(ts);
if (Arrays.binarySearch(terms, t) < 0) {
return t;
}
}
}
private static class TermAndState {
public final BytesRef term;
public final TermState state;
public TermAndState(BytesRef term, TermState state) {
this.term = term;
this.state = state;
}
}
private void testRandomSeeks(IndexReader r, String... validTermStrings) throws IOException {
final BytesRef[] validTerms = new BytesRef[validTermStrings.length];
for(int termIDX=0;termIDX<validTermStrings.length;termIDX++) {
validTerms[termIDX] = new BytesRef(validTermStrings[termIDX]);
}
Arrays.sort(validTerms);
if (VERBOSE) {
System.out.println("TEST: " + validTerms.length + " terms:");
for(BytesRef t : validTerms) {
System.out.println(" " + t.utf8ToString() + " " + t);
}
}
final TermsEnum te = MultiFields.getTerms(r, FIELD).iterator(null);
final int END_LOC = -validTerms.length-1;
final List<TermAndState> termStates = new ArrayList<TermAndState>();
for(int iter=0;iter<100*RANDOM_MULTIPLIER;iter++) {
final BytesRef t;
int loc;
final TermState termState;
if (random().nextInt(6) == 4) {
// pick term that doens't exist:
t = getNonExistTerm(validTerms);
termState = null;
if (VERBOSE) {
System.out.println("\nTEST: invalid term=" + t.utf8ToString());
}
loc = Arrays.binarySearch(validTerms, t);
} else if (termStates.size() != 0 && random().nextInt(4) == 1) {
final TermAndState ts = termStates.get(random().nextInt(termStates.size()));
t = ts.term;
loc = Arrays.binarySearch(validTerms, t);
assertTrue(loc >= 0);
termState = ts.state;
if (VERBOSE) {
System.out.println("\nTEST: valid termState term=" + t.utf8ToString());
}
} else {
// pick valid term
loc = random().nextInt(validTerms.length);
t = BytesRef.deepCopyOf(validTerms[loc]);
termState = null;
if (VERBOSE) {
System.out.println("\nTEST: valid term=" + t.utf8ToString());
}
}
// seekCeil or seekExact:
final boolean doSeekExact = random().nextBoolean();
if (termState != null) {
if (VERBOSE) {
System.out.println(" seekExact termState");
}
te.seekExact(t, termState);
} else if (doSeekExact) {
if (VERBOSE) {
System.out.println(" seekExact");
}
assertEquals(loc >= 0, te.seekExact(t));
} else {
if (VERBOSE) {
System.out.println(" seekCeil");
}
final TermsEnum.SeekStatus result = te.seekCeil(t);
if (VERBOSE) {
System.out.println(" got " + result);
}
if (loc >= 0) {
assertEquals(TermsEnum.SeekStatus.FOUND, result);
} else if (loc == END_LOC) {
assertEquals(TermsEnum.SeekStatus.END, result);
} else {
assert loc >= -validTerms.length;
assertEquals(TermsEnum.SeekStatus.NOT_FOUND, result);
}
}
if (loc >= 0) {
assertEquals(t, te.term());
} else if (doSeekExact) {
// TermsEnum is unpositioned if seekExact returns false
continue;
} else if (loc == END_LOC) {
continue;
} else {
loc = -loc-1;
assertEquals(validTerms[loc], te.term());
}
// Do a bunch of next's after the seek
final int numNext = random().nextInt(validTerms.length);
for(int nextCount=0;nextCount<numNext;nextCount++) {
if (VERBOSE) {
System.out.println("\nTEST: next loc=" + loc + " of " + validTerms.length);
}
final BytesRef t2 = te.next();
loc++;
if (loc == validTerms.length) {
assertNull(t2);
break;
} else {
assertEquals(validTerms[loc], t2);
if (random().nextInt(40) == 17 && termStates.size() < 100) {
termStates.add(new TermAndState(validTerms[loc], te.termState()));
}
}
}
}
}
public void testIntersectBasic() throws Exception {
Directory dir = newDirectory();
IndexWriterConfig iwc = newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()));
iwc.setMergePolicy(new LogDocMergePolicy());
RandomIndexWriter w = new RandomIndexWriter(random(), dir, iwc);
Document doc = new Document();
doc.add(newTextField("field", "aaa", Field.Store.NO));
w.addDocument(doc);
doc = new Document();
doc.add(newStringField("field", "bbb", Field.Store.NO));
w.addDocument(doc);
doc = new Document();
doc.add(newTextField("field", "ccc", Field.Store.NO));
w.addDocument(doc);
w.forceMerge(1);
DirectoryReader r = w.getReader();
w.close();
AtomicReader sub = getOnlySegmentReader(r);
Terms terms = sub.fields().terms("field");
Automaton automaton = new RegExp(".*", RegExp.NONE).toAutomaton();
CompiledAutomaton ca = new CompiledAutomaton(automaton, false, false);
TermsEnum te = terms.intersect(ca, null);
assertEquals("aaa", te.next().utf8ToString());
assertEquals(0, te.docs(null, null, DocsEnum.FLAG_NONE).nextDoc());
assertEquals("bbb", te.next().utf8ToString());
assertEquals(1, te.docs(null, null, DocsEnum.FLAG_NONE).nextDoc());
assertEquals("ccc", te.next().utf8ToString());
assertEquals(2, te.docs(null, null, DocsEnum.FLAG_NONE).nextDoc());
assertNull(te.next());
te = terms.intersect(ca, new BytesRef("abc"));
assertEquals("bbb", te.next().utf8ToString());
assertEquals(1, te.docs(null, null, DocsEnum.FLAG_NONE).nextDoc());
assertEquals("ccc", te.next().utf8ToString());
assertEquals(2, te.docs(null, null, DocsEnum.FLAG_NONE).nextDoc());
assertNull(te.next());
te = terms.intersect(ca, new BytesRef("aaa"));
assertEquals("bbb", te.next().utf8ToString());
assertEquals(1, te.docs(null, null, DocsEnum.FLAG_NONE).nextDoc());
assertEquals("ccc", te.next().utf8ToString());
assertEquals(2, te.docs(null, null, DocsEnum.FLAG_NONE).nextDoc());
assertNull(te.next());
r.close();
dir.close();
}
public void testIntersectStartTerm() throws Exception {
Directory dir = newDirectory();
IndexWriterConfig iwc = newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()));
iwc.setMergePolicy(new LogDocMergePolicy());
RandomIndexWriter w = new RandomIndexWriter(random(), dir, iwc);
Document doc = new Document();
doc.add(newStringField("field", "abc", Field.Store.NO));
w.addDocument(doc);
doc = new Document();
doc.add(newStringField("field", "abd", Field.Store.NO));
w.addDocument(doc);
doc = new Document();
doc.add(newStringField("field", "acd", Field.Store.NO));
w.addDocument(doc);
doc = new Document();
doc.add(newStringField("field", "bcd", Field.Store.NO));
w.addDocument(doc);
w.forceMerge(1);
DirectoryReader r = w.getReader();
w.close();
AtomicReader sub = getOnlySegmentReader(r);
Terms terms = sub.fields().terms("field");
Automaton automaton = new RegExp(".*d", RegExp.NONE).toAutomaton();
CompiledAutomaton ca = new CompiledAutomaton(automaton, false, false);
TermsEnum te;
// should seek to startTerm
te = terms.intersect(ca, new BytesRef("aad"));
assertEquals("abd", te.next().utf8ToString());
assertEquals(1, te.docs(null, null, DocsEnum.FLAG_NONE).nextDoc());
assertEquals("acd", te.next().utf8ToString());
assertEquals(2, te.docs(null, null, DocsEnum.FLAG_NONE).nextDoc());
assertEquals("bcd", te.next().utf8ToString());
assertEquals(3, te.docs(null, null, DocsEnum.FLAG_NONE).nextDoc());
assertNull(te.next());
// should fail to find ceil label on second arc, rewind
te = terms.intersect(ca, new BytesRef("add"));
assertEquals("bcd", te.next().utf8ToString());
assertEquals(3, te.docs(null, null, DocsEnum.FLAG_NONE).nextDoc());
assertNull(te.next());
// should reach end
te = terms.intersect(ca, new BytesRef("bcd"));
assertNull(te.next());
te = terms.intersect(ca, new BytesRef("ddd"));
assertNull(te.next());
r.close();
dir.close();
}
public void testIntersectEmptyString() throws Exception {
Directory dir = newDirectory();
IndexWriterConfig iwc = newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()));
iwc.setMergePolicy(new LogDocMergePolicy());
RandomIndexWriter w = new RandomIndexWriter(random(), dir, iwc);
Document doc = new Document();
doc.add(newStringField("field", "", Field.Store.NO));
doc.add(newStringField("field", "abc", Field.Store.NO));
w.addDocument(doc);
doc = new Document();
// add empty string to both documents, so that singletonDocID == -1.
// For a FST-based term dict, we'll expect to see the first arc is
// flaged with HAS_FINAL_OUTPUT
doc.add(newStringField("field", "abc", Field.Store.NO));
doc.add(newStringField("field", "", Field.Store.NO));
w.addDocument(doc);
w.forceMerge(1);
DirectoryReader r = w.getReader();
w.close();
AtomicReader sub = getOnlySegmentReader(r);
Terms terms = sub.fields().terms("field");
Automaton automaton = new RegExp(".*", RegExp.NONE).toAutomaton(); // accept ALL
CompiledAutomaton ca = new CompiledAutomaton(automaton, false, false);
TermsEnum te = terms.intersect(ca, null);
DocsEnum de;
assertEquals("", te.next().utf8ToString());
de = te.docs(null, null, DocsEnum.FLAG_NONE);
assertEquals(0, de.nextDoc());
assertEquals(1, de.nextDoc());
assertEquals("abc", te.next().utf8ToString());
de = te.docs(null, null, DocsEnum.FLAG_NONE);
assertEquals(0, de.nextDoc());
assertEquals(1, de.nextDoc());
assertNull(te.next());
// pass empty string
te = terms.intersect(ca, new BytesRef(""));
assertEquals("abc", te.next().utf8ToString());
de = te.docs(null, null, DocsEnum.FLAG_NONE);
assertEquals(0, de.nextDoc());
assertEquals(1, de.nextDoc());
assertNull(te.next());
r.close();
dir.close();
}
}