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.
*/
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;
import org.junit.AfterClass;
import org.junit.BeforeClass;
public class TestNGramPhraseQuery extends LuceneTestCase {
private static IndexReader reader;
private static Directory directory;
@BeforeClass
public static void beforeClass() throws Exception {
directory = newDirectory();
RandomIndexWriter writer = new RandomIndexWriter(random(), directory);
writer.close();
reader = DirectoryReader.open(directory);
}
@AfterClass
public static void afterClass() throws Exception {
reader.close();
reader = null;
directory.close();
directory = null;
}
public void testRewrite() throws Exception {
// bi-gram test ABC => AB/BC => AB/BC
PhraseQuery pq1 = new NGramPhraseQuery(2);
pq1.add(new Term("f", "AB"));
pq1.add(new Term("f", "BC"));
Query q = pq1.rewrite(reader);
assertTrue(q instanceof NGramPhraseQuery);
assertSame(pq1, q);
pq1 = (NGramPhraseQuery)q;
assertArrayEquals(new Term[]{new Term("f", "AB"), new Term("f", "BC")}, pq1.getTerms());
assertArrayEquals(new int[]{0, 1}, pq1.getPositions());
// bi-gram test ABCD => AB/BC/CD => AB//CD
PhraseQuery pq2 = new NGramPhraseQuery(2);
pq2.add(new Term("f", "AB"));
pq2.add(new Term("f", "BC"));
pq2.add(new Term("f", "CD"));
q = pq2.rewrite(reader);
assertTrue(q instanceof PhraseQuery);
assertNotSame(pq2, q);
pq2 = (PhraseQuery)q;
assertArrayEquals(new Term[]{new Term("f", "AB"), new Term("f", "CD")}, pq2.getTerms());
assertArrayEquals(new int[]{0, 2}, pq2.getPositions());
// tri-gram test ABCDEFGH => ABC/BCD/CDE/DEF/EFG/FGH => ABC///DEF//FGH
PhraseQuery pq3 = new NGramPhraseQuery(3);
pq3.add(new Term("f", "ABC"));
pq3.add(new Term("f", "BCD"));
pq3.add(new Term("f", "CDE"));
pq3.add(new Term("f", "DEF"));
pq3.add(new Term("f", "EFG"));
pq3.add(new Term("f", "FGH"));
q = pq3.rewrite(reader);
assertTrue(q instanceof PhraseQuery);
assertNotSame(pq3, q);
pq3 = (PhraseQuery)q;
assertArrayEquals(new Term[]{new Term("f", "ABC"), new Term("f", "DEF"), new Term("f", "FGH")}, pq3.getTerms());
assertArrayEquals(new int[]{0, 3, 5}, pq3.getPositions());
// LUCENE-4970: boosting test
PhraseQuery pq4 = new NGramPhraseQuery(2);
pq4.add(new Term("f", "AB"));
pq4.add(new Term("f", "BC"));
pq4.add(new Term("f", "CD"));
pq4.setBoost(100.0F);
q = pq4.rewrite(reader);
assertNotSame(pq4, q);
assertEquals(pq4.getBoost(), q.getBoost(), 0.1f);
}
}