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package org.apache.lucene.search;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import org.apache.lucene.document.Document;
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import org.apache.lucene.document.Field;
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import org.apache.lucene.index.IndexReader;
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import org.apache.lucene.index.RandomIndexWriter;
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import org.apache.lucene.index.Term;
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import org.apache.lucene.store.Directory;
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import org.apache.lucene.util.LuceneTestCase;
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import java.io.IOException;
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/** This class only tests some basic functionality in CSQ, the main parts are mostly
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* tested by MultiTermQuery tests, explanations seems to be tested in TestExplanations! */
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public class TestConstantScoreQuery extends LuceneTestCase {
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public void testCSQ() throws Exception {
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final Query q1 = new ConstantScoreQuery(new TermQuery(new Term("a", "b")));
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final Query q2 = new ConstantScoreQuery(new TermQuery(new Term("a", "c")));
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final Query q3 = new ConstantScoreQuery(new TermRangeFilter("a", "b", "c", true, true));
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QueryUtils.checkEqual(q1,q1);
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QueryUtils.checkEqual(q2,q2);
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QueryUtils.checkEqual(q3,q3);
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QueryUtils.checkUnequal(q1,q2);
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QueryUtils.checkUnequal(q2,q3);
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QueryUtils.checkUnequal(q1,q3);
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QueryUtils.checkUnequal(q1, new TermQuery(new Term("a", "b")));
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private void checkHits(Searcher searcher, Query q, final float expectedScore, final String scorerClassName, final String innerScorerClassName) throws IOException {
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final int[] count = new int[1];
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searcher.search(q, new Collector() {
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private Scorer scorer;
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public void setScorer(Scorer scorer) {
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assertEquals("Scorer is implemented by wrong class", scorerClassName, scorer.getClass().getName());
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if (innerScorerClassName != null && scorer instanceof ConstantScoreQuery.ConstantScorer) {
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final ConstantScoreQuery.ConstantScorer innerScorer = (ConstantScoreQuery.ConstantScorer) scorer;
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assertEquals("inner Scorer is implemented by wrong class", innerScorerClassName, innerScorer.docIdSetIterator.getClass().getName());
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public void collect(int doc) throws IOException {
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assertEquals("Score differs from expected", expectedScore, this.scorer.score(), 0);
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public void setNextReader(IndexReader reader, int docBase) {
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public boolean acceptsDocsOutOfOrder() {
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assertEquals("invalid number of results", 1, count[0]);
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public void testWrapped2Times() throws Exception {
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Directory directory = null;
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IndexReader reader = null;
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IndexSearcher searcher = null;
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directory = newDirectory();
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RandomIndexWriter writer = new RandomIndexWriter (random, directory);
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Document doc = new Document();
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doc.add(newField("field", "term", Field.Store.NO, Field.Index.NOT_ANALYZED));
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writer.addDocument(doc);
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reader = writer.getReader();
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searcher = newSearcher(reader);
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// set a similarity that does not normalize our boost away
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searcher.setSimilarity(new DefaultSimilarity() {
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public float queryNorm(float sumOfSquaredWeights) {
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final Query csq1 = new ConstantScoreQuery(new TermQuery(new Term ("field", "term")));
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final Query csq2 = new ConstantScoreQuery(csq1);
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final BooleanQuery bq = new BooleanQuery();
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bq.add(csq1, BooleanClause.Occur.SHOULD);
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bq.add(csq2, BooleanClause.Occur.SHOULD);
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final Query csqbq = new ConstantScoreQuery(bq);
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csqbq.setBoost(17.0f);
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checkHits(searcher, csq1, csq1.getBoost(), ConstantScoreQuery.ConstantScorer.class.getName(), null);
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checkHits(searcher, csq2, csq2.getBoost(), ConstantScoreQuery.ConstantScorer.class.getName(), ConstantScoreQuery.ConstantScorer.class.getName());
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// for the combined BQ, the scorer should always be BooleanScorer's BucketScorer, because our scorer supports out-of order collection!
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final String bucketScorerClass = BooleanScorer.class.getName() + "$BucketScorer";
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checkHits(searcher, bq, csq1.getBoost() + csq2.getBoost(), bucketScorerClass, null);
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checkHits(searcher, csqbq, csqbq.getBoost(), ConstantScoreQuery.ConstantScorer.class.getName(), bucketScorerClass);
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if (searcher != null) searcher.close();
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if (reader != null) reader.close();
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if (directory != null) directory.close();