| /* |
| * 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. |
| */ |
| package org.apache.lucene.search; |
| |
| |
| 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 |
| NGramPhraseQuery pq1 = new NGramPhraseQuery(2, new PhraseQuery("f", "AB", "BC")); |
| |
| Query q = pq1.rewrite(reader); |
| assertSame(q.rewrite(reader), q); |
| PhraseQuery rewritten1 = (PhraseQuery) q; |
| assertArrayEquals(new Term[]{new Term("f", "AB"), new Term("f", "BC")}, rewritten1.getTerms()); |
| assertArrayEquals(new int[]{0, 1}, rewritten1.getPositions()); |
| |
| // bi-gram test ABCD => AB/BC/CD => AB//CD |
| NGramPhraseQuery pq2 = new NGramPhraseQuery(2, new PhraseQuery("f", "AB", "BC", "CD")); |
| |
| q = pq2.rewrite(reader); |
| assertTrue(q instanceof PhraseQuery); |
| assertNotSame(pq2, q); |
| PhraseQuery rewritten2 = (PhraseQuery) q; |
| assertArrayEquals(new Term[]{new Term("f", "AB"), new Term("f", "CD")}, rewritten2.getTerms()); |
| assertArrayEquals(new int[]{0, 2}, rewritten2.getPositions()); |
| |
| // tri-gram test ABCDEFGH => ABC/BCD/CDE/DEF/EFG/FGH => ABC///DEF//FGH |
| NGramPhraseQuery pq3 = new NGramPhraseQuery(3, new PhraseQuery("f", "ABC", "BCD", "CDE", "DEF", "EFG", "FGH")); |
| |
| q = pq3.rewrite(reader); |
| assertTrue(q instanceof PhraseQuery); |
| assertNotSame(pq3, q); |
| PhraseQuery rewritten3 = (PhraseQuery) q; |
| assertArrayEquals(new Term[]{new Term("f", "ABC"), new Term("f", "DEF"), new Term("f", "FGH")}, rewritten3.getTerms()); |
| assertArrayEquals(new int[]{0, 3, 5}, rewritten3.getPositions()); |
| } |
| |
| } |