package org.apache.lucene.search;
/**
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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.io.Reader;
import junit.framework.TestCase;
import org.apache.lucene.analysis.WhitespaceAnalyzer;
import org.apache.lucene.analysis.StopAnalyzer;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.WhitespaceTokenizer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.RAMDirectory;
/**
* Tests {@link PhraseQuery}.
*
* @see TestPositionIncrement
* @author Erik Hatcher
*/
public class TestPhraseQuery extends TestCase {
private IndexSearcher searcher;
private PhraseQuery query;
private RAMDirectory directory;
public void setUp() throws Exception {
directory = new RAMDirectory();
Analyzer analyzer = new Analyzer() {
public TokenStream tokenStream(String fieldName, Reader reader) {
return new WhitespaceTokenizer(reader);
}
public int getPositionIncrementGap(String fieldName) {
return 100;
}
};
IndexWriter writer = new IndexWriter(directory, analyzer, true);
Document doc = new Document();
doc.add(new Field("field", "one two three four five", Field.Store.YES, Field.Index.TOKENIZED));
doc.add(new Field("repeated", "this is a repeated field - first part", Field.Store.YES, Field.Index.TOKENIZED));
Field repeatedField = new Field("repeated", "second part of a repeated field", Field.Store.YES, Field.Index.TOKENIZED);
doc.add(repeatedField);
writer.addDocument(doc);
writer.optimize();
writer.close();
searcher = new IndexSearcher(directory);
query = new PhraseQuery();
}
public void tearDown() throws Exception {
searcher.close();
directory.close();
}
public void testNotCloseEnough() throws Exception {
query.setSlop(2);
query.add(new Term("field", "one"));
query.add(new Term("field", "five"));
Hits hits = searcher.search(query);
assertEquals(0, hits.length());
}
public void testBarelyCloseEnough() throws Exception {
query.setSlop(3);
query.add(new Term("field", "one"));
query.add(new Term("field", "five"));
Hits hits = searcher.search(query);
assertEquals(1, hits.length());
}
/**
* Ensures slop of 0 works for exact matches, but not reversed
*/
public void testExact() throws Exception {
// slop is zero by default
query.add(new Term("field", "four"));
query.add(new Term("field", "five"));
Hits hits = searcher.search(query);
assertEquals("exact match", 1, hits.length());
query = new PhraseQuery();
query.add(new Term("field", "two"));
query.add(new Term("field", "one"));
hits = searcher.search(query);
assertEquals("reverse not exact", 0, hits.length());
}
public void testSlop1() throws Exception {
// Ensures slop of 1 works with terms in order.
query.setSlop(1);
query.add(new Term("field", "one"));
query.add(new Term("field", "two"));
Hits hits = searcher.search(query);
assertEquals("in order", 1, hits.length());
// Ensures slop of 1 does not work for phrases out of order;
// must be at least 2.
query = new PhraseQuery();
query.setSlop(1);
query.add(new Term("field", "two"));
query.add(new Term("field", "one"));
hits = searcher.search(query);
assertEquals("reversed, slop not 2 or more", 0, hits.length());
}
/**
* As long as slop is at least 2, terms can be reversed
*/
public void testOrderDoesntMatter() throws Exception {
query.setSlop(2); // must be at least two for reverse order match
query.add(new Term("field", "two"));
query.add(new Term("field", "one"));
Hits hits = searcher.search(query);
assertEquals("just sloppy enough", 1, hits.length());
query = new PhraseQuery();
query.setSlop(2);
query.add(new Term("field", "three"));
query.add(new Term("field", "one"));
hits = searcher.search(query);
assertEquals("not sloppy enough", 0, hits.length());
}
/**
* slop is the total number of positional moves allowed
* to line up a phrase
*/
public void testMulipleTerms() throws Exception {
query.setSlop(2);
query.add(new Term("field", "one"));
query.add(new Term("field", "three"));
query.add(new Term("field", "five"));
Hits hits = searcher.search(query);
assertEquals("two total moves", 1, hits.length());
query = new PhraseQuery();
query.setSlop(5); // it takes six moves to match this phrase
query.add(new Term("field", "five"));
query.add(new Term("field", "three"));
query.add(new Term("field", "one"));
hits = searcher.search(query);
assertEquals("slop of 5 not close enough", 0, hits.length());
query.setSlop(6);
hits = searcher.search(query);
assertEquals("slop of 6 just right", 1, hits.length());
}
public void testPhraseQueryWithStopAnalyzer() throws Exception {
RAMDirectory directory = new RAMDirectory();
StopAnalyzer stopAnalyzer = new StopAnalyzer();
IndexWriter writer = new IndexWriter(directory, stopAnalyzer, true);
Document doc = new Document();
doc.add(new Field("field", "the stop words are here", Field.Store.YES, Field.Index.TOKENIZED));
writer.addDocument(doc);
writer.close();
IndexSearcher searcher = new IndexSearcher(directory);
// valid exact phrase query
PhraseQuery query = new PhraseQuery();
query.add(new Term("field","stop"));
query.add(new Term("field","words"));
Hits hits = searcher.search(query);
assertEquals(1, hits.length());
// currently StopAnalyzer does not leave "holes", so this matches.
query = new PhraseQuery();
query.add(new Term("field", "words"));
query.add(new Term("field", "here"));
hits = searcher.search(query);
assertEquals(1, hits.length());
searcher.close();
}
public void testPhraseQueryInConjunctionScorer() throws Exception {
RAMDirectory directory = new RAMDirectory();
IndexWriter writer = new IndexWriter(directory, new WhitespaceAnalyzer(), true);
Document doc = new Document();
doc.add(new Field("source", "marketing info", Field.Store.YES, Field.Index.TOKENIZED));
writer.addDocument(doc);
doc = new Document();
doc.add(new Field("contents", "foobar", Field.Store.YES, Field.Index.TOKENIZED));
doc.add(new Field("source", "marketing info", Field.Store.YES, Field.Index.TOKENIZED));
writer.addDocument(doc);
writer.optimize();
writer.close();
IndexSearcher searcher = new IndexSearcher(directory);
PhraseQuery phraseQuery = new PhraseQuery();
phraseQuery.add(new Term("source", "marketing"));
phraseQuery.add(new Term("source", "info"));
Hits hits = searcher.search(phraseQuery);
assertEquals(2, hits.length());
TermQuery termQuery = new TermQuery(new Term("contents","foobar"));
BooleanQuery booleanQuery = new BooleanQuery();
booleanQuery.add(termQuery, BooleanClause.Occur.MUST);
booleanQuery.add(phraseQuery, BooleanClause.Occur.MUST);
hits = searcher.search(booleanQuery);
assertEquals(1, hits.length());
searcher.close();
writer = new IndexWriter(directory, new WhitespaceAnalyzer(), true);
doc = new Document();
doc.add(new Field("contents", "map entry woo", Field.Store.YES, Field.Index.TOKENIZED));
writer.addDocument(doc);
doc = new Document();
doc.add(new Field("contents", "woo map entry", Field.Store.YES, Field.Index.TOKENIZED));
writer.addDocument(doc);
doc = new Document();
doc.add(new Field("contents", "map foobarword entry woo", Field.Store.YES, Field.Index.TOKENIZED));
writer.addDocument(doc);
writer.optimize();
writer.close();
searcher = new IndexSearcher(directory);
termQuery = new TermQuery(new Term("contents","woo"));
phraseQuery = new PhraseQuery();
phraseQuery.add(new Term("contents","map"));
phraseQuery.add(new Term("contents","entry"));
hits = searcher.search(termQuery);
assertEquals(3, hits.length());
hits = searcher.search(phraseQuery);
assertEquals(2, hits.length());
booleanQuery = new BooleanQuery();
booleanQuery.add(termQuery, BooleanClause.Occur.MUST);
booleanQuery.add(phraseQuery, BooleanClause.Occur.MUST);
hits = searcher.search(booleanQuery);
assertEquals(2, hits.length());
booleanQuery = new BooleanQuery();
booleanQuery.add(phraseQuery, BooleanClause.Occur.MUST);
booleanQuery.add(termQuery, BooleanClause.Occur.MUST);
hits = searcher.search(booleanQuery);
assertEquals(2, hits.length());
searcher.close();
directory.close();
}
public void testSlopScoring() throws IOException {
Directory directory = new RAMDirectory();
IndexWriter writer = new IndexWriter(directory, new WhitespaceAnalyzer(), true);
Document doc = new Document();
doc.add(new Field("field", "foo firstname lastname foo", Field.Store.YES, Field.Index.TOKENIZED));
writer.addDocument(doc);
Document doc2 = new Document();
doc2.add(new Field("field", "foo firstname xxx lastname foo", Field.Store.YES, Field.Index.TOKENIZED));
writer.addDocument(doc2);
Document doc3 = new Document();
doc3.add(new Field("field", "foo firstname xxx yyy lastname foo", Field.Store.YES, Field.Index.TOKENIZED));
writer.addDocument(doc3);
writer.optimize();
writer.close();
Searcher searcher = new IndexSearcher(directory);
PhraseQuery query = new PhraseQuery();
query.add(new Term("field", "firstname"));
query.add(new Term("field", "lastname"));
query.setSlop(Integer.MAX_VALUE);
Hits hits = searcher.search(query);
assertEquals(3, hits.length());
// Make sure that those matches where the terms appear closer to
// each other get a higher score:
assertEquals(0.71, hits.score(0), 0.01);
assertEquals(0, hits.id(0));
assertEquals(0.44, hits.score(1), 0.01);
assertEquals(1, hits.id(1));
assertEquals(0.31, hits.score(2), 0.01);
assertEquals(2, hits.id(2));
}
public void testWrappedPhrase() throws IOException {
query.add(new Term("repeated", "first"));
query.add(new Term("repeated", "part"));
query.add(new Term("repeated", "second"));
query.add(new Term("repeated", "part"));
query.setSlop(99);
Hits hits = searcher.search(query);
assertEquals(0, hits.length());
}
}
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