Lucene example source code file (ShingleAnalyzerWrapperTest.java)
The Lucene ShingleAnalyzerWrapperTest.java source codepackage org.apache.lucene.analysis.shingle;
/**
* 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.Reader;
import java.io.StringReader;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.BaseTokenStreamTestCase;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.analysis.MockTokenizer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.PhraseQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.RAMDirectory;
/**
* A test class for ShingleAnalyzerWrapper as regards queries and scoring.
*/
public class ShingleAnalyzerWrapperTest extends BaseTokenStreamTestCase {
public IndexSearcher searcher;
/**
* Set up a new index in RAM with three test phrases and the supplied Analyzer.
*
* @param analyzer the analyzer to use
* @return an indexSearcher on the test index.
* @throws Exception if an error occurs with index writer or searcher
*/
public IndexSearcher setUpSearcher(Analyzer analyzer) throws Exception {
Directory dir = new RAMDirectory();
IndexWriter writer = new IndexWriter(dir, new IndexWriterConfig(TEST_VERSION_CURRENT, analyzer));
Document doc;
doc = new Document();
doc.add(new Field("content", "please divide this sentence into shingles",
Field.Store.YES,Field.Index.ANALYZED));
writer.addDocument(doc);
doc = new Document();
doc.add(new Field("content", "just another test sentence",
Field.Store.YES,Field.Index.ANALYZED));
writer.addDocument(doc);
doc = new Document();
doc.add(new Field("content", "a sentence which contains no test",
Field.Store.YES,Field.Index.ANALYZED));
writer.addDocument(doc);
writer.close();
return new IndexSearcher(dir, true);
}
protected ScoreDoc[] queryParsingTest(Analyzer analyzer, String qs) throws Exception {
searcher = setUpSearcher(analyzer);
QueryParser qp = new QueryParser(TEST_VERSION_CURRENT, "content", analyzer);
Query q = qp.parse(qs);
return searcher.search(q, null, 1000).scoreDocs;
}
protected void compareRanks(ScoreDoc[] hits, int[] ranks) throws Exception {
assertEquals(ranks.length, hits.length);
for (int i = 0; i < ranks.length; i++) {
assertEquals(ranks[i], hits[i].doc);
}
}
/*
* Will not work on an index without unigrams, since QueryParser automatically
* tokenizes on whitespace.
*/
public void testShingleAnalyzerWrapperQueryParsing() throws Exception {
ScoreDoc[] hits = queryParsingTest(new ShingleAnalyzerWrapper
(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false), 2),
"test sentence");
int[] ranks = new int[] { 1, 2, 0 };
compareRanks(hits, ranks);
}
/*
* This one fails with an exception.
*/
public void testShingleAnalyzerWrapperPhraseQueryParsingFails() throws Exception {
ScoreDoc[] hits = queryParsingTest(new ShingleAnalyzerWrapper
(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false), 2),
"\"this sentence\"");
int[] ranks = new int[] { 0 };
compareRanks(hits, ranks);
}
/*
* This one works, actually.
*/
public void testShingleAnalyzerWrapperPhraseQueryParsing() throws Exception {
ScoreDoc[] hits = queryParsingTest(new ShingleAnalyzerWrapper
(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false), 2),
"\"test sentence\"");
int[] ranks = new int[] { 1 };
compareRanks(hits, ranks);
}
/*
* Same as above, is tokenized without using the analyzer.
*/
public void testShingleAnalyzerWrapperRequiredQueryParsing() throws Exception {
ScoreDoc[] hits = queryParsingTest(new ShingleAnalyzerWrapper
(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false), 2),
"+test +sentence");
int[] ranks = new int[] { 1, 2 };
compareRanks(hits, ranks);
}
/*
* This shows how to construct a phrase query containing shingles.
*/
public void testShingleAnalyzerWrapperPhraseQuery() throws Exception {
Analyzer analyzer = new ShingleAnalyzerWrapper(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false), 2);
searcher = setUpSearcher(analyzer);
PhraseQuery q = new PhraseQuery();
TokenStream ts = analyzer.tokenStream("content",
new StringReader("this sentence"));
int j = -1;
PositionIncrementAttribute posIncrAtt = ts.addAttribute(PositionIncrementAttribute.class);
CharTermAttribute termAtt = ts.addAttribute(CharTermAttribute.class);
ts.reset();
while (ts.incrementToken()) {
j += posIncrAtt.getPositionIncrement();
String termText = termAtt.toString();
q.add(new Term("content", termText), j);
}
ScoreDoc[] hits = searcher.search(q, null, 1000).scoreDocs;
int[] ranks = new int[] { 0 };
compareRanks(hits, ranks);
}
/*
* How to construct a boolean query with shingles. A query like this will
* implicitly score those documents higher that contain the words in the query
* in the right order and adjacent to each other.
*/
public void testShingleAnalyzerWrapperBooleanQuery() throws Exception {
Analyzer analyzer = new ShingleAnalyzerWrapper(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false), 2);
searcher = setUpSearcher(analyzer);
BooleanQuery q = new BooleanQuery();
TokenStream ts = analyzer.tokenStream("content",
new StringReader("test sentence"));
CharTermAttribute termAtt = ts.addAttribute(CharTermAttribute.class);
ts.reset();
while (ts.incrementToken()) {
String termText = termAtt.toString();
q.add(new TermQuery(new Term("content", termText)),
BooleanClause.Occur.SHOULD);
}
ScoreDoc[] hits = searcher.search(q, null, 1000).scoreDocs;
int[] ranks = new int[] { 1, 2, 0 };
compareRanks(hits, ranks);
}
public void testReusableTokenStream() throws Exception {
Analyzer a = new ShingleAnalyzerWrapper(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false), 2);
assertAnalyzesToReuse(a, "please divide into shingles",
new String[] { "please", "please divide", "divide", "divide into", "into", "into shingles", "shingles" },
new int[] { 0, 0, 7, 7, 14, 14, 19 },
new int[] { 6, 13, 13, 18, 18, 27, 27 },
new int[] { 1, 0, 1, 0, 1, 0, 1 });
assertAnalyzesToReuse(a, "divide me up again",
new String[] { "divide", "divide me", "me", "me up", "up", "up again", "again" },
new int[] { 0, 0, 7, 7, 10, 10, 13 },
new int[] { 6, 9, 9, 12, 12, 18, 18 },
new int[] { 1, 0, 1, 0, 1, 0, 1 });
}
/*
* analyzer that does not support reuse
* it is LetterTokenizer on odd invocations, WhitespaceTokenizer on even.
*/
private class NonreusableAnalyzer extends Analyzer {
int invocationCount = 0;
@Override
public TokenStream tokenStream(String fieldName, Reader reader) {
if (++invocationCount % 2 == 0)
return new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
else
return new MockTokenizer(reader, MockTokenizer.SIMPLE, false);
}
}
public void testWrappedAnalyzerDoesNotReuse() throws Exception {
Analyzer a = new ShingleAnalyzerWrapper(new NonreusableAnalyzer());
assertAnalyzesToReuse(a, "please divide into shingles.",
new String[] { "please", "please divide", "divide", "divide into", "into", "into shingles", "shingles" },
new int[] { 0, 0, 7, 7, 14, 14, 19 },
new int[] { 6, 13, 13, 18, 18, 27, 27 },
new int[] { 1, 0, 1, 0, 1, 0, 1 });
assertAnalyzesToReuse(a, "please divide into shingles.",
new String[] { "please", "please divide", "divide", "divide into", "into", "into shingles.", "shingles." },
new int[] { 0, 0, 7, 7, 14, 14, 19 },
new int[] { 6, 13, 13, 18, 18, 28, 28 },
new int[] { 1, 0, 1, 0, 1, 0, 1 });
assertAnalyzesToReuse(a, "please divide into shingles.",
new String[] { "please", "please divide", "divide", "divide into", "into", "into shingles", "shingles" },
new int[] { 0, 0, 7, 7, 14, 14, 19 },
new int[] { 6, 13, 13, 18, 18, 27, 27 },
new int[] { 1, 0, 1, 0, 1, 0, 1 });
}
public void testNonDefaultMinShingleSize() throws Exception {
ShingleAnalyzerWrapper analyzer
= new ShingleAnalyzerWrapper(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false), 3, 4);
assertAnalyzesToReuse(analyzer, "please divide this sentence into shingles",
new String[] { "please", "please divide this", "please divide this sentence",
"divide", "divide this sentence", "divide this sentence into",
"this", "this sentence into", "this sentence into shingles",
"sentence", "sentence into shingles",
"into",
"shingles" },
new int[] { 0, 0, 0, 7, 7, 7, 14, 14, 14, 19, 19, 28, 33 },
new int[] { 6, 18, 27, 13, 27, 32, 18, 32, 41, 27, 41, 32, 41 },
new int[] { 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1 });
analyzer.setOutputUnigrams(false);
assertAnalyzesToReuse(analyzer, "please divide this sentence into shingles",
new String[] { "please divide this", "please divide this sentence",
"divide this sentence", "divide this sentence into",
"this sentence into", "this sentence into shingles",
"sentence into shingles" },
new int[] { 0, 0, 7, 7, 14, 14, 19 },
new int[] { 18, 27, 27, 32, 32, 41, 41 },
new int[] { 1, 0, 1, 0, 1, 0, 1 });
}
public void testNonDefaultMinAndSameMaxShingleSize() throws Exception {
ShingleAnalyzerWrapper analyzer
= new ShingleAnalyzerWrapper(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false), 3, 3);
assertAnalyzesToReuse(analyzer, "please divide this sentence into shingles",
new String[] { "please", "please divide this",
"divide", "divide this sentence",
"this", "this sentence into",
"sentence", "sentence into shingles",
"into",
"shingles" },
new int[] { 0, 0, 7, 7, 14, 14, 19, 19, 28, 33 },
new int[] { 6, 18, 13, 27, 18, 32, 27, 41, 32, 41 },
new int[] { 1, 0, 1, 0, 1, 0, 1, 0, 1, 1 });
analyzer.setOutputUnigrams(false);
assertAnalyzesToReuse(analyzer, "please divide this sentence into shingles",
new String[] { "please divide this",
"divide this sentence",
"this sentence into",
"sentence into shingles" },
new int[] { 0, 7, 14, 19 },
new int[] { 18, 27, 32, 41 },
new int[] { 1, 1, 1, 1 });
}
public void testNoTokenSeparator() throws Exception {
ShingleAnalyzerWrapper analyzer
= new ShingleAnalyzerWrapper(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false));
analyzer.setTokenSeparator("");
assertAnalyzesToReuse(analyzer, "please divide into shingles",
new String[] { "please", "pleasedivide",
"divide", "divideinto",
"into", "intoshingles",
"shingles" },
new int[] { 0, 0, 7, 7, 14, 14, 19 },
new int[] { 6, 13, 13, 18, 18, 27, 27 },
new int[] { 1, 0, 1, 0, 1, 0, 1 });
analyzer.setOutputUnigrams(false);
assertAnalyzesToReuse(analyzer, "please divide into shingles",
new String[] { "pleasedivide",
"divideinto",
"intoshingles" },
new int[] { 0, 7, 14 },
new int[] { 13, 18, 27 },
new int[] { 1, 1, 1 });
}
public void testNullTokenSeparator() throws Exception {
ShingleAnalyzerWrapper analyzer
= new ShingleAnalyzerWrapper(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false));
analyzer.setTokenSeparator(null);
assertAnalyzesToReuse(analyzer, "please divide into shingles",
new String[] { "please", "pleasedivide",
"divide", "divideinto",
"into", "intoshingles",
"shingles" },
new int[] { 0, 0, 7, 7, 14, 14, 19 },
new int[] { 6, 13, 13, 18, 18, 27, 27 },
new int[] { 1, 0, 1, 0, 1, 0, 1 });
analyzer.setOutputUnigrams(false);
assertAnalyzesToReuse(analyzer, "please divide into shingles",
new String[] { "pleasedivide",
"divideinto",
"intoshingles" },
new int[] { 0, 7, 14 },
new int[] { 13, 18, 27 },
new int[] { 1, 1, 1 });
}
public void testAltTokenSeparator() throws Exception {
ShingleAnalyzerWrapper analyzer
= new ShingleAnalyzerWrapper(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false));
analyzer.setTokenSeparator("<SEP>");
assertAnalyzesToReuse(analyzer, "please divide into shingles",
new String[] { "please", "please<SEP>divide",
"divide", "divide<SEP>into",
"into", "into<SEP>shingles",
"shingles" },
new int[] { 0, 0, 7, 7, 14, 14, 19 },
new int[] { 6, 13, 13, 18, 18, 27, 27 },
new int[] { 1, 0, 1, 0, 1, 0, 1 });
analyzer.setOutputUnigrams(false);
assertAnalyzesToReuse(analyzer, "please divide into shingles",
new String[] { "please<SEP>divide",
"divide<SEP>into",
"into<SEP>shingles" },
new int[] { 0, 7, 14 },
new int[] { 13, 18, 27 },
new int[] { 1, 1, 1 });
}
public void testOutputUnigramsIfNoShinglesSingleToken() throws Exception {
ShingleAnalyzerWrapper analyzer
= new ShingleAnalyzerWrapper(new MockAnalyzer(random, MockTokenizer.WHITESPACE, false));
analyzer.setOutputUnigrams(false);
analyzer.setOutputUnigramsIfNoShingles(true);
assertAnalyzesToReuse(analyzer, "please",
new String[] { "please" },
new int[] { 0 },
new int[] { 6 },
new int[] { 1 });
}
}
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