package org.apache.lucene.search.function;
/**
* 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 org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.search.*;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
/**
* Test CustomScoreQuery search.
*/
public class TestCustomScoreQuery extends FunctionTestSetup {
/* @override constructor */
public TestCustomScoreQuery() {
super(true);
}
/**
* Test that CustomScoreQuery of Type.BYTE returns the expected scores.
*/
@Test
public void testCustomScoreByte() throws Exception, ParseException {
// INT field values are small enough to be parsed as byte
doTestCustomScore(INT_FIELD, FieldScoreQuery.Type.BYTE, 1.0);
doTestCustomScore(INT_FIELD, FieldScoreQuery.Type.BYTE, 2.0);
}
/**
* Test that CustomScoreQuery of Type.SHORT returns the expected scores.
*/
@Test
public void testCustomScoreShort() throws Exception, ParseException {
// INT field values are small enough to be parsed as short
doTestCustomScore(INT_FIELD, FieldScoreQuery.Type.SHORT, 1.0);
doTestCustomScore(INT_FIELD, FieldScoreQuery.Type.SHORT, 3.0);
}
/**
* Test that CustomScoreQuery of Type.INT returns the expected scores.
*/
@Test
public void testCustomScoreInt() throws Exception, ParseException {
doTestCustomScore(INT_FIELD, FieldScoreQuery.Type.INT, 1.0);
doTestCustomScore(INT_FIELD, FieldScoreQuery.Type.INT, 4.0);
}
/**
* Test that CustomScoreQuery of Type.FLOAT returns the expected scores.
*/
@Test
public void testCustomScoreFloat() throws Exception, ParseException {
// INT field can be parsed as float
doTestCustomScore(INT_FIELD, FieldScoreQuery.Type.FLOAT, 1.0);
doTestCustomScore(INT_FIELD, FieldScoreQuery.Type.FLOAT, 5.0);
// same values, but in float format
doTestCustomScore(FLOAT_FIELD, FieldScoreQuery.Type.FLOAT, 1.0);
doTestCustomScore(FLOAT_FIELD, FieldScoreQuery.Type.FLOAT, 6.0);
}
// must have static class otherwise serialization tests fail
private static class CustomAddQuery extends CustomScoreQuery {
// constructor
CustomAddQuery(Query q, ValueSourceQuery qValSrc) {
super(q, qValSrc);
}
/*(non-Javadoc) @see org.apache.lucene.search.function.CustomScoreQuery#name() */
@Override
public String name() {
return "customAdd";
}
@Override
protected CustomScoreProvider getCustomScoreProvider(IndexReader reader) {
return new CustomScoreProvider(reader) {
@Override
public float customScore(int doc, float subQueryScore, float valSrcScore) {
return subQueryScore + valSrcScore;
}
@Override
public Explanation customExplain(int doc, Explanation subQueryExpl, Explanation valSrcExpl) {
float valSrcScore = valSrcExpl == null ? 0 : valSrcExpl.getValue();
Explanation exp = new Explanation(valSrcScore + subQueryExpl.getValue(), "custom score: sum of:");
exp.addDetail(subQueryExpl);
if (valSrcExpl != null) {
exp.addDetail(valSrcExpl);
}
return exp;
}
};
}
}
// must have static class otherwise serialization tests fail
private static class CustomMulAddQuery extends CustomScoreQuery {
// constructor
CustomMulAddQuery(Query q, ValueSourceQuery qValSrc1, ValueSourceQuery qValSrc2) {
super(q, new ValueSourceQuery[]{qValSrc1, qValSrc2});
}
/*(non-Javadoc) @see org.apache.lucene.search.function.CustomScoreQuery#name() */
@Override
public String name() {
return "customMulAdd";
}
@Override
protected CustomScoreProvider getCustomScoreProvider(IndexReader reader) {
return new CustomScoreProvider(reader) {
@Override
public float customScore(int doc, float subQueryScore, float valSrcScores[]) {
if (valSrcScores.length == 0) {
return subQueryScore;
}
if (valSrcScores.length == 1) {
return subQueryScore + valSrcScores[0];
// confirm that skipping beyond the last doc, on the
// previous reader, hits NO_MORE_DOCS
}
return (subQueryScore + valSrcScores[0]) * valSrcScores[1]; // we know there are two
}
@Override
public Explanation customExplain(int doc, Explanation subQueryExpl, Explanation valSrcExpls[]) {
if (valSrcExpls.length == 0) {
return subQueryExpl;
}
Explanation exp = new Explanation(valSrcExpls[0].getValue() + subQueryExpl.getValue(), "sum of:");
exp.addDetail(subQueryExpl);
exp.addDetail(valSrcExpls[0]);
if (valSrcExpls.length == 1) {
exp.setDescription("CustomMulAdd, sum of:");
return exp;
}
Explanation exp2 = new Explanation(valSrcExpls[1].getValue() * exp.getValue(), "custom score: product of:");
exp2.addDetail(valSrcExpls[1]);
exp2.addDetail(exp);
return exp2;
}
};
}
}
private final class CustomExternalQuery extends CustomScoreQuery {
@Override
protected CustomScoreProvider getCustomScoreProvider(IndexReader reader) throws IOException {
final int[] values = FieldCache.DEFAULT.getInts(reader, INT_FIELD);
return new CustomScoreProvider(reader) {
@Override
public float customScore(int doc, float subScore, float valSrcScore) throws IOException {
assertTrue(doc <= reader.maxDoc());
return values[doc];
}
};
}
public CustomExternalQuery(Query q) {
super(q);
}
}
@Test
public void testCustomExternalQuery() throws Exception {
QueryParser qp = new QueryParser(TEST_VERSION_CURRENT, TEXT_FIELD,anlzr);
String qtxt = "first aid text"; // from the doc texts in FunctionQuerySetup.
Query q1 = qp.parse(qtxt);
final Query q = new CustomExternalQuery(q1);
log(q);
IndexSearcher s = new IndexSearcher(dir);
TopDocs hits = s.search(q, 1000);
assertEquals(N_DOCS, hits.totalHits);
for(int i=0;i<N_DOCS;i++) {
final int doc = hits.scoreDocs[i].doc;
final float score = hits.scoreDocs[i].score;
assertEquals("doc=" + doc, (float) 1+(4*doc) % N_DOCS, score, 0.0001);
}
s.close();
}
@Test
public void testRewrite() throws Exception {
final IndexSearcher s = new IndexSearcher(dir, true);
Query q = new TermQuery(new Term(TEXT_FIELD, "first"));
CustomScoreQuery original = new CustomScoreQuery(q);
CustomScoreQuery rewritten = (CustomScoreQuery) original.rewrite(s.getIndexReader());
assertTrue("rewritten query should be identical, as TermQuery does not rewrite", original == rewritten);
assertTrue("no hits for query", s.search(rewritten,1).totalHits > 0);
assertEquals(s.search(q,1).totalHits, s.search(rewritten,1).totalHits);
q = new TermRangeQuery(TEXT_FIELD, null, null, true, true); // everything
original = new CustomScoreQuery(q);
rewritten = (CustomScoreQuery) original.rewrite(s.getIndexReader());
assertTrue("rewritten query should not be identical, as TermRangeQuery rewrites", original != rewritten);
assertTrue("no hits for query", s.search(rewritten,1).totalHits > 0);
assertEquals(s.search(q,1).totalHits, s.search(original,1).totalHits);
assertEquals(s.search(q,1).totalHits, s.search(rewritten,1).totalHits);
s.close();
}
// Test that FieldScoreQuery returns docs with expected score.
private void doTestCustomScore(String field, FieldScoreQuery.Type tp, double dboost) throws Exception, ParseException {
float boost = (float) dboost;
IndexSearcher s = new IndexSearcher(dir, true);
FieldScoreQuery qValSrc = new FieldScoreQuery(field, tp); // a query that would score by the field
QueryParser qp = new QueryParser(TEST_VERSION_CURRENT, TEXT_FIELD, anlzr);
String qtxt = "first aid text"; // from the doc texts in FunctionQuerySetup.
// regular (boolean) query.
Query q1 = qp.parse(qtxt);
log(q1);
// custom query, that should score the same as q1.
Query q2CustomNeutral = new CustomScoreQuery(q1);
q2CustomNeutral.setBoost(boost);
log(q2CustomNeutral);
// custom query, that should (by default) multiply the scores of q1 by that of the field
CustomScoreQuery q3CustomMul = new CustomScoreQuery(q1, qValSrc);
q3CustomMul.setStrict(true);
q3CustomMul.setBoost(boost);
log(q3CustomMul);
// custom query, that should add the scores of q1 to that of the field
CustomScoreQuery q4CustomAdd = new CustomAddQuery(q1, qValSrc);
q4CustomAdd.setStrict(true);
q4CustomAdd.setBoost(boost);
log(q4CustomAdd);
// custom query, that multiplies and adds the field score to that of q1
CustomScoreQuery q5CustomMulAdd = new CustomMulAddQuery(q1, qValSrc, qValSrc);
q5CustomMulAdd.setStrict(true);
q5CustomMulAdd.setBoost(boost);
log(q5CustomMulAdd);
// do al the searches
TopDocs td1 = s.search(q1, null, 1000);
TopDocs td2CustomNeutral = s.search(q2CustomNeutral, null, 1000);
TopDocs td3CustomMul = s.search(q3CustomMul, null, 1000);
TopDocs td4CustomAdd = s.search(q4CustomAdd, null, 1000);
TopDocs td5CustomMulAdd = s.search(q5CustomMulAdd, null, 1000);
// put results in map so we can verify the scores although they have changed
Map<Integer,Float> h1 = topDocsToMap(td1);
Map<Integer,Float> h2CustomNeutral = topDocsToMap(td2CustomNeutral);
Map<Integer,Float> h3CustomMul = topDocsToMap(td3CustomMul);
Map<Integer,Float> h4CustomAdd = topDocsToMap(td4CustomAdd);
Map<Integer,Float> h5CustomMulAdd = topDocsToMap(td5CustomMulAdd);
verifyResults(boost, s,
h1, h2CustomNeutral, h3CustomMul, h4CustomAdd, h5CustomMulAdd,
q1, q2CustomNeutral, q3CustomMul, q4CustomAdd, q5CustomMulAdd);
s.close();
}
// verify results are as expected.
private void verifyResults(float boost, IndexSearcher s,
Map<Integer,Float> h1, Map<Integer,Float> h2customNeutral, Map<Integer,Float> h3CustomMul, Map<Integer,Float> h4CustomAdd, Map<Integer,Float> h5CustomMulAdd,
Query q1, Query q2, Query q3, Query q4, Query q5) throws Exception {
// verify numbers of matches
log("#hits = "+h1.size());
assertEquals("queries should have same #hits",h1.size(),h2customNeutral.size());
assertEquals("queries should have same #hits",h1.size(),h3CustomMul.size());
assertEquals("queries should have same #hits",h1.size(),h4CustomAdd.size());
assertEquals("queries should have same #hits",h1.size(),h5CustomMulAdd.size());
QueryUtils.check(q1,s);
QueryUtils.check(q2,s);
QueryUtils.check(q3,s);
QueryUtils.check(q4,s);
QueryUtils.check(q5,s);
// verify scores ratios
for (final Integer doc : h1.keySet()) {
log("doc = "+doc);
float fieldScore = expectedFieldScore(s.getIndexReader().document(doc).get(ID_FIELD));
log("fieldScore = " + fieldScore);
assertTrue("fieldScore should not be 0", fieldScore > 0);
float score1 = h1.get(doc);
logResult("score1=", s, q1, doc, score1);
float score2 = h2customNeutral.get(doc);
logResult("score2=", s, q2, doc, score2);
assertEquals("same score (just boosted) for neutral", boost * score1, score2, TEST_SCORE_TOLERANCE_DELTA);
float score3 = h3CustomMul.get(doc);
logResult("score3=", s, q3, doc, score3);
assertEquals("new score for custom mul", boost * fieldScore * score1, score3, TEST_SCORE_TOLERANCE_DELTA);
float score4 = h4CustomAdd.get(doc);
logResult("score4=", s, q4, doc, score4);
assertEquals("new score for custom add", boost * (fieldScore + score1), score4, TEST_SCORE_TOLERANCE_DELTA);
float score5 = h5CustomMulAdd.get(doc);
logResult("score5=", s, q5, doc, score5);
assertEquals("new score for custom mul add", boost * fieldScore * (score1 + fieldScore), score5, TEST_SCORE_TOLERANCE_DELTA);
}
}
private void logResult(String msg, Searcher s, Query q, int doc, float score1) throws IOException {
log(msg+" "+score1);
log("Explain by: "+q);
log(s.explain(q,doc));
}
// since custom scoring modifies the order of docs, map results
// by doc ids so that we can later compare/verify them
private Map<Integer,Float> topDocsToMap(TopDocs td) {
Map<Integer,Float> h = new HashMap<Integer,Float>();
for (int i=0; i<td.totalHits; i++) {
h.put(td.scoreDocs[i].doc, td.scoreDocs[i].score);
}
return h;
}
}