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 java.io.IOException;
import java.util.Arrays;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
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.apache.lucene.util.automaton.Automaton;
import org.apache.lucene.util.automaton.AutomatonProvider;
import org.apache.lucene.util.automaton.BasicAutomata;
import org.apache.lucene.util.automaton.BasicOperations;
import org.apache.lucene.util.automaton.RegExp;
/**
* Some simple regex tests, mostly converted from contrib's TestRegexQuery.
*/
public class TestRegexpQuery extends LuceneTestCase {
private IndexSearcher searcher;
private IndexReader reader;
private Directory directory;
private final String FN = "field";
@Override
public void setUp() throws Exception {
super.setUp();
directory = newDirectory();
RandomIndexWriter writer = new RandomIndexWriter(random(), directory);
Document doc = new Document();
doc.add(newTextField(FN, "the quick brown fox jumps over the lazy ??? dog 493432 49344", Field.Store.NO));
writer.addDocument(doc);
reader = writer.getReader();
writer.close();
searcher = newSearcher(reader);
}
@Override
public void tearDown() throws Exception {
reader.close();
directory.close();
super.tearDown();
}
private Term newTerm(String value) {
return new Term(FN, value);
}
private int regexQueryNrHits(String regex) throws IOException {
RegexpQuery query = new RegexpQuery(newTerm(regex));
return searcher.search(query, 5).totalHits;
}
public void testRegex1() throws IOException {
assertEquals(1, regexQueryNrHits("q.[aeiou]c.*"));
}
public void testRegex2() throws IOException {
assertEquals(0, regexQueryNrHits(".[aeiou]c.*"));
}
public void testRegex3() throws IOException {
assertEquals(0, regexQueryNrHits("q.[aeiou]c"));
}
public void testNumericRange() throws IOException {
assertEquals(1, regexQueryNrHits("<420000-600000>"));
assertEquals(0, regexQueryNrHits("<493433-600000>"));
}
public void testRegexComplement() throws IOException {
assertEquals(1, regexQueryNrHits("4934~[3]"));
// not the empty lang, i.e. match all docs
assertEquals(1, regexQueryNrHits("~#"));
}
public void testCustomProvider() throws IOException {
AutomatonProvider myProvider = new AutomatonProvider() {
// automaton that matches quick or brown
private Automaton quickBrownAutomaton = BasicOperations.union(Arrays
.asList(BasicAutomata.makeString("quick"),
BasicAutomata.makeString("brown"),
BasicAutomata.makeString("bob")));
@Override
public Automaton getAutomaton(String name) {
if (name.equals("quickBrown")) return quickBrownAutomaton;
else return null;
}
};
RegexpQuery query = new RegexpQuery(newTerm("<quickBrown>"), RegExp.ALL,
myProvider);
assertEquals(1, searcher.search(query, 5).totalHits);
}
/**
* Test a corner case for backtracking: In this case the term dictionary has
* 493432 followed by 49344. When backtracking from 49343... to 4934, its
* necessary to test that 4934 itself is ok before trying to append more
* characters.
*/
public void testBacktracking() throws IOException {
assertEquals(1, regexQueryNrHits("4934[314]"));
}
}