package org.apache.lucene.search;
/*
* 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.
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import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.SortedSetDocValuesField;
import org.apache.lucene.document.StringField;
import org.apache.lucene.index.AtomicReader;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.SortedSetDocValues;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermContext;
import org.apache.lucene.search.BooleanQuery.BooleanWeight;
import org.apache.lucene.search.similarities.DefaultSimilarity;
import org.apache.lucene.search.similarities.Similarity.SimScorer;
import org.apache.lucene.search.similarities.Similarity.SimWeight;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util._TestUtil;
import org.apache.lucene.util.LuceneTestCase.SuppressCodecs;
import org.junit.AfterClass;
import org.junit.BeforeClass;
/** tests BooleanScorer2's minShouldMatch */
@SuppressCodecs({"Appending", "Lucene3x", "Lucene40", "Lucene41"})
public class TestMinShouldMatch2 extends LuceneTestCase {
static Directory dir;
static DirectoryReader r;
static AtomicReader reader;
static IndexSearcher searcher;
static final String alwaysTerms[] = { "a" };
static final String commonTerms[] = { "b", "c", "d" };
static final String mediumTerms[] = { "e", "f", "g" };
static final String rareTerms[] = { "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" };
@BeforeClass
public static void beforeClass() throws Exception {
dir = newDirectory();
RandomIndexWriter iw = new RandomIndexWriter(random(), dir);
final int numDocs = atLeast(300);
for (int i = 0; i < numDocs; i++) {
Document doc = new Document();
addSome(doc, alwaysTerms);
if (random().nextInt(100) < 90) {
addSome(doc, commonTerms);
}
if (random().nextInt(100) < 50) {
addSome(doc, mediumTerms);
}
if (random().nextInt(100) < 10) {
addSome(doc, rareTerms);
}
iw.addDocument(doc);
}
iw.forceMerge(1);
iw.close();
r = DirectoryReader.open(dir);
reader = getOnlySegmentReader(r);
searcher = new IndexSearcher(reader);
searcher.setSimilarity(new DefaultSimilarity() {
@Override
public float queryNorm(float sumOfSquaredWeights) {
return 1; // we disable queryNorm, both for debugging and ease of impl
}
});
}
@AfterClass
public static void afterClass() throws Exception {
reader.close();
dir.close();
searcher = null;
reader = null;
r = null;
dir = null;
}
private static void addSome(Document doc, String values[]) {
List<String> list = Arrays.asList(values);
Collections.shuffle(list, random());
int howMany = _TestUtil.nextInt(random(), 1, list.size());
for (int i = 0; i < howMany; i++) {
doc.add(new StringField("field", list.get(i), Field.Store.NO));
doc.add(new SortedSetDocValuesField("dv", new BytesRef(list.get(i))));
}
}
private Scorer scorer(String values[], int minShouldMatch, boolean slow) throws Exception {
BooleanQuery bq = new BooleanQuery();
for (String value : values) {
bq.add(new TermQuery(new Term("field", value)), BooleanClause.Occur.SHOULD);
}
bq.setMinimumNumberShouldMatch(minShouldMatch);
BooleanWeight weight = (BooleanWeight) searcher.createNormalizedWeight(bq);
if (slow) {
return new SlowMinShouldMatchScorer(weight, reader, searcher);
} else {
return weight.scorer(reader.getContext(), true, false, null);
}
}
private void assertNext(Scorer expected, Scorer actual) throws Exception {
if (actual == null) {
assertEquals(DocIdSetIterator.NO_MORE_DOCS, expected.nextDoc());
return;
}
int doc;
while ((doc = expected.nextDoc()) != DocIdSetIterator.NO_MORE_DOCS) {
assertEquals(doc, actual.nextDoc());
assertEquals(expected.freq(), actual.freq());
float expectedScore = expected.score();
float actualScore = actual.score();
assertEquals(expectedScore, actualScore, CheckHits.explainToleranceDelta(expectedScore, actualScore));
}
assertEquals(DocIdSetIterator.NO_MORE_DOCS, actual.nextDoc());
}
private void assertAdvance(Scorer expected, Scorer actual, int amount) throws Exception {
if (actual == null) {
assertEquals(DocIdSetIterator.NO_MORE_DOCS, expected.nextDoc());
return;
}
int prevDoc = 0;
int doc;
while ((doc = expected.advance(prevDoc+amount)) != DocIdSetIterator.NO_MORE_DOCS) {
assertEquals(doc, actual.advance(prevDoc+amount));
assertEquals(expected.freq(), actual.freq());
float expectedScore = expected.score();
float actualScore = actual.score();
assertEquals(expectedScore, actualScore, CheckHits.explainToleranceDelta(expectedScore, actualScore));
prevDoc = doc;
}
assertEquals(DocIdSetIterator.NO_MORE_DOCS, actual.advance(prevDoc+amount));
}
/** simple test for next(): minShouldMatch=2 on 3 terms (one common, one medium, one rare) */
public void testNextCMR2() throws Exception {
for (int common = 0; common < commonTerms.length; common++) {
for (int medium = 0; medium < mediumTerms.length; medium++) {
for (int rare = 0; rare < rareTerms.length; rare++) {
Scorer expected = scorer(new String[] { commonTerms[common], mediumTerms[medium], rareTerms[rare] }, 2, true);
Scorer actual = scorer(new String[] { commonTerms[common], mediumTerms[medium], rareTerms[rare] }, 2, false);
assertNext(expected, actual);
}
}
}
}
/** simple test for advance(): minShouldMatch=2 on 3 terms (one common, one medium, one rare) */
public void testAdvanceCMR2() throws Exception {
for (int amount = 25; amount < 200; amount += 25) {
for (int common = 0; common < commonTerms.length; common++) {
for (int medium = 0; medium < mediumTerms.length; medium++) {
for (int rare = 0; rare < rareTerms.length; rare++) {
Scorer expected = scorer(new String[] { commonTerms[common], mediumTerms[medium], rareTerms[rare] }, 2, true);
Scorer actual = scorer(new String[] { commonTerms[common], mediumTerms[medium], rareTerms[rare] }, 2, false);
assertAdvance(expected, actual, amount);
}
}
}
}
}
/** test next with giant bq of all terms with varying minShouldMatch */
public void testNextAllTerms() throws Exception {
List<String> termsList = new ArrayList<String>();
termsList.addAll(Arrays.asList(commonTerms));
termsList.addAll(Arrays.asList(mediumTerms));
termsList.addAll(Arrays.asList(rareTerms));
String terms[] = termsList.toArray(new String[0]);
for (int minNrShouldMatch = 1; minNrShouldMatch <= terms.length; minNrShouldMatch++) {
Scorer expected = scorer(terms, minNrShouldMatch, true);
Scorer actual = scorer(terms, minNrShouldMatch, false);
assertNext(expected, actual);
}
}
/** test advance with giant bq of all terms with varying minShouldMatch */
public void testAdvanceAllTerms() throws Exception {
List<String> termsList = new ArrayList<String>();
termsList.addAll(Arrays.asList(commonTerms));
termsList.addAll(Arrays.asList(mediumTerms));
termsList.addAll(Arrays.asList(rareTerms));
String terms[] = termsList.toArray(new String[0]);
for (int amount = 25; amount < 200; amount += 25) {
for (int minNrShouldMatch = 1; minNrShouldMatch <= terms.length; minNrShouldMatch++) {
Scorer expected = scorer(terms, minNrShouldMatch, true);
Scorer actual = scorer(terms, minNrShouldMatch, false);
assertAdvance(expected, actual, amount);
}
}
}
/** test next with varying numbers of terms with varying minShouldMatch */
public void testNextVaryingNumberOfTerms() throws Exception {
List<String> termsList = new ArrayList<String>();
termsList.addAll(Arrays.asList(commonTerms));
termsList.addAll(Arrays.asList(mediumTerms));
termsList.addAll(Arrays.asList(rareTerms));
Collections.shuffle(termsList, random());
for (int numTerms = 2; numTerms <= termsList.size(); numTerms++) {
String terms[] = termsList.subList(0, numTerms).toArray(new String[0]);
for (int minNrShouldMatch = 1; minNrShouldMatch <= terms.length; minNrShouldMatch++) {
Scorer expected = scorer(terms, minNrShouldMatch, true);
Scorer actual = scorer(terms, minNrShouldMatch, false);
assertNext(expected, actual);
}
}
}
/** test advance with varying numbers of terms with varying minShouldMatch */
public void testAdvanceVaryingNumberOfTerms() throws Exception {
List<String> termsList = new ArrayList<String>();
termsList.addAll(Arrays.asList(commonTerms));
termsList.addAll(Arrays.asList(mediumTerms));
termsList.addAll(Arrays.asList(rareTerms));
Collections.shuffle(termsList, random());
for (int amount = 25; amount < 200; amount += 25) {
for (int numTerms = 2; numTerms <= termsList.size(); numTerms++) {
String terms[] = termsList.subList(0, numTerms).toArray(new String[0]);
for (int minNrShouldMatch = 1; minNrShouldMatch <= terms.length; minNrShouldMatch++) {
Scorer expected = scorer(terms, minNrShouldMatch, true);
Scorer actual = scorer(terms, minNrShouldMatch, false);
assertAdvance(expected, actual, amount);
}
}
}
}
// TODO: more tests
// a slow min-should match scorer that uses a docvalues field.
// later, we can make debugging easier as it can record the set of ords it currently matched
// and e.g. print out their values and so on for the document
static class SlowMinShouldMatchScorer extends Scorer {
int currentDoc = -1; // current docid
int currentMatched = -1; // current number of terms matched
final SortedSetDocValues dv;
final int maxDoc;
final Set<Long> ords = new HashSet<Long>();
final SimScorer[] sims;
final int minNrShouldMatch;
double score = Float.NaN;
SlowMinShouldMatchScorer(BooleanWeight weight, AtomicReader reader, IndexSearcher searcher) throws IOException {
super(weight);
this.dv = reader.getSortedSetDocValues("dv");
this.maxDoc = reader.maxDoc();
BooleanQuery bq = (BooleanQuery) weight.getQuery();
this.minNrShouldMatch = bq.getMinimumNumberShouldMatch();
this.sims = new SimScorer[(int)dv.getValueCount()];
for (BooleanClause clause : bq.getClauses()) {
assert !clause.isProhibited();
assert !clause.isRequired();
Term term = ((TermQuery)clause.getQuery()).getTerm();
long ord = dv.lookupTerm(term.bytes());
if (ord >= 0) {
boolean success = ords.add(ord);
assert success; // no dups
TermContext context = TermContext.build(reader.getContext(), term);
SimWeight w = weight.similarity.computeWeight(1f,
searcher.collectionStatistics("field"),
searcher.termStatistics(term, context));
w.getValueForNormalization(); // ignored
w.normalize(1F, 1F);
sims[(int)ord] = weight.similarity.simScorer(w, reader.getContext());
}
}
}
@Override
public float score() throws IOException {
assert score != 0 : currentMatched;
return (float)score * ((BooleanWeight) weight).coord(currentMatched, ((BooleanWeight) weight).maxCoord);
}
@Override
public int freq() throws IOException {
return currentMatched;
}
@Override
public int docID() {
return currentDoc;
}
@Override
public int nextDoc() throws IOException {
assert currentDoc != NO_MORE_DOCS;
for (currentDoc = currentDoc+1; currentDoc < maxDoc; currentDoc++) {
currentMatched = 0;
score = 0;
dv.setDocument(currentDoc);
long ord;
while ((ord = dv.nextOrd()) != SortedSetDocValues.NO_MORE_ORDS) {
if (ords.contains(ord)) {
currentMatched++;
score += sims[(int)ord].score(currentDoc, 1);
}
}
if (currentMatched >= minNrShouldMatch) {
return currentDoc;
}
}
return currentDoc = NO_MORE_DOCS;
}
@Override
public int advance(int target) throws IOException {
int doc;
while ((doc = nextDoc()) < target) {
}
return doc;
}
@Override
public long cost() {
return maxDoc;
}
}
}