| package org.apache.lucene.analysis.query; |
| /** |
| * 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.io.Reader; |
| import java.io.StringReader; |
| |
| import org.apache.lucene.analysis.Analyzer; |
| import org.apache.lucene.analysis.BaseTokenStreamTestCase; |
| import org.apache.lucene.analysis.LetterTokenizer; |
| import org.apache.lucene.analysis.TokenStream; |
| import org.apache.lucene.analysis.WhitespaceAnalyzer; |
| import org.apache.lucene.analysis.WhitespaceTokenizer; |
| import org.apache.lucene.analysis.tokenattributes.TermAttribute; |
| import org.apache.lucene.document.Document; |
| import org.apache.lucene.document.Field; |
| import org.apache.lucene.index.IndexReader; |
| import org.apache.lucene.index.IndexWriter; |
| import org.apache.lucene.index.IndexWriterConfig; |
| import org.apache.lucene.index.Term; |
| import org.apache.lucene.queryParser.ParseException; |
| import org.apache.lucene.queryParser.QueryParser; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.search.Query; |
| import org.apache.lucene.store.RAMDirectory; |
| |
| public class QueryAutoStopWordAnalyzerTest extends BaseTokenStreamTestCase { |
| String variedFieldValues[] = {"the", "quick", "brown", "fox", "jumped", "over", "the", "lazy", "boring", "dog"}; |
| String repetitiveFieldValues[] = {"boring", "boring", "vaguelyboring"}; |
| RAMDirectory dir; |
| Analyzer appAnalyzer; |
| IndexReader reader; |
| QueryAutoStopWordAnalyzer protectedAnalyzer; |
| |
| @Override |
| protected void setUp() throws Exception { |
| super.setUp(); |
| dir = new RAMDirectory(); |
| appAnalyzer = new WhitespaceAnalyzer(TEST_VERSION_CURRENT); |
| IndexWriter writer = new IndexWriter(dir, new IndexWriterConfig(TEST_VERSION_CURRENT, appAnalyzer)); |
| int numDocs = 200; |
| for (int i = 0; i < numDocs; i++) { |
| Document doc = new Document(); |
| String variedFieldValue = variedFieldValues[i % variedFieldValues.length]; |
| String repetitiveFieldValue = repetitiveFieldValues[i % repetitiveFieldValues.length]; |
| doc.add(new Field("variedField", variedFieldValue, Field.Store.YES, Field.Index.ANALYZED)); |
| doc.add(new Field("repetitiveField", repetitiveFieldValue, Field.Store.YES, Field.Index.ANALYZED)); |
| writer.addDocument(doc); |
| } |
| writer.close(); |
| reader = IndexReader.open(dir, true); |
| protectedAnalyzer = new QueryAutoStopWordAnalyzer(TEST_VERSION_CURRENT, appAnalyzer); |
| } |
| |
| @Override |
| protected void tearDown() throws Exception { |
| reader.close(); |
| super.tearDown(); |
| } |
| |
| //Helper method to query |
| private int search(Analyzer a, String queryString) throws IOException, ParseException { |
| QueryParser qp = new QueryParser(TEST_VERSION_CURRENT, "repetitiveField", a); |
| Query q = qp.parse(queryString); |
| return new IndexSearcher(reader).search(q, null, 1000).totalHits; |
| } |
| |
| public void testUninitializedAnalyzer() throws Exception { |
| //Note: no calls to "addStopWord" |
| String query = "variedField:quick repetitiveField:boring"; |
| int numHits1 = search(protectedAnalyzer, query); |
| int numHits2 = search(appAnalyzer, query); |
| assertEquals("No filtering test", numHits1, numHits2); |
| } |
| |
| /* |
| * Test method for 'org.apache.lucene.analysis.QueryAutoStopWordAnalyzer.addStopWords(IndexReader)' |
| */ |
| public void testDefaultAddStopWordsIndexReader() throws Exception { |
| protectedAnalyzer.addStopWords(reader); |
| int numHits = search(protectedAnalyzer, "repetitiveField:boring"); |
| assertEquals("Default filter should remove all docs", 0, numHits); |
| } |
| |
| |
| /* |
| * Test method for 'org.apache.lucene.analysis.QueryAutoStopWordAnalyzer.addStopWords(IndexReader, int)' |
| */ |
| public void testAddStopWordsIndexReaderInt() throws Exception { |
| protectedAnalyzer.addStopWords(reader, 1f / 2f); |
| int numHits = search(protectedAnalyzer, "repetitiveField:boring"); |
| assertEquals("A filter on terms in > one half of docs remove boring docs", 0, numHits); |
| |
| numHits = search(protectedAnalyzer, "repetitiveField:vaguelyboring"); |
| assertTrue("A filter on terms in > half of docs should not remove vaguelyBoring docs", numHits > 1); |
| |
| protectedAnalyzer.addStopWords(reader, 1f / 4f); |
| numHits = search(protectedAnalyzer, "repetitiveField:vaguelyboring"); |
| assertEquals("A filter on terms in > quarter of docs should remove vaguelyBoring docs", 0, numHits); |
| } |
| |
| |
| public void testAddStopWordsIndexReaderStringFloat() throws Exception { |
| protectedAnalyzer.addStopWords(reader, "variedField", 1f / 2f); |
| int numHits = search(protectedAnalyzer, "repetitiveField:boring"); |
| assertTrue("A filter on one Field should not affect queris on another", numHits > 0); |
| |
| protectedAnalyzer.addStopWords(reader, "repetitiveField", 1f / 2f); |
| numHits = search(protectedAnalyzer, "repetitiveField:boring"); |
| assertEquals("A filter on the right Field should affect queries on it", numHits, 0); |
| } |
| |
| public void testAddStopWordsIndexReaderStringInt() throws Exception { |
| int numStopWords = protectedAnalyzer.addStopWords(reader, "repetitiveField", 10); |
| assertTrue("Should have identified stop words", numStopWords > 0); |
| |
| Term[] t = protectedAnalyzer.getStopWords(); |
| assertEquals("num terms should = num stopwords returned", t.length, numStopWords); |
| |
| int numNewStopWords = protectedAnalyzer.addStopWords(reader, "variedField", 10); |
| assertTrue("Should have identified more stop words", numNewStopWords > 0); |
| t = protectedAnalyzer.getStopWords(); |
| assertEquals("num terms should = num stopwords returned", t.length, numStopWords + numNewStopWords); |
| } |
| |
| public void testNoFieldNamePollution() throws Exception { |
| protectedAnalyzer.addStopWords(reader, "repetitiveField", 10); |
| int numHits = search(protectedAnalyzer, "repetitiveField:boring"); |
| assertEquals("Check filter set up OK", 0, numHits); |
| |
| numHits = search(protectedAnalyzer, "variedField:boring"); |
| assertTrue("Filter should not prevent stopwords in one field being used in another ", numHits > 0); |
| |
| } |
| |
| /* |
| * 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 WhitespaceTokenizer(TEST_VERSION_CURRENT, reader); |
| else |
| return new LetterTokenizer(TEST_VERSION_CURRENT, reader); |
| } |
| } |
| |
| public void testWrappingNonReusableAnalyzer() throws Exception { |
| QueryAutoStopWordAnalyzer a = new QueryAutoStopWordAnalyzer(TEST_VERSION_CURRENT, new NonreusableAnalyzer()); |
| a.addStopWords(reader, 10); |
| int numHits = search(a, "repetitiveField:boring"); |
| assertTrue(numHits == 0); |
| numHits = search(a, "repetitiveField:vaguelyboring"); |
| assertTrue(numHits == 0); |
| } |
| |
| public void testTokenStream() throws Exception { |
| QueryAutoStopWordAnalyzer a = new QueryAutoStopWordAnalyzer(TEST_VERSION_CURRENT, new WhitespaceAnalyzer(TEST_VERSION_CURRENT)); |
| a.addStopWords(reader, 10); |
| TokenStream ts = a.tokenStream("repetitiveField", new StringReader("this boring")); |
| TermAttribute termAtt = ts.getAttribute(TermAttribute.class); |
| assertTrue(ts.incrementToken()); |
| assertEquals("this", termAtt.term()); |
| assertFalse(ts.incrementToken()); |
| } |
| } |