--- /dev/null
+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 java.util.Arrays;
+import java.util.Collections;
+
+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.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
+ public void setUp() throws Exception {
+ super.setUp();
+ dir = new RAMDirectory();
+ appAnalyzer = new MockAnalyzer(random, MockTokenizer.WHITESPACE, false);
+ 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);
+ }
+
+ @Override
+ public 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);
+ IndexSearcher searcher = newSearcher(reader);
+ int hits = searcher.search(q, null, 1000).totalHits;
+ searcher.close();
+ return hits;
+ }
+
+ public void testNoStopwords() throws Exception {
+ // Note: an empty list of fields passed in
+ protectedAnalyzer = new QueryAutoStopWordAnalyzer(TEST_VERSION_CURRENT, appAnalyzer, reader, Collections.<String>emptyList(), 1);
+ String query = "variedField:quick repetitiveField:boring";
+ int numHits1 = search(protectedAnalyzer, query);
+ int numHits2 = search(appAnalyzer, query);
+ assertEquals("No filtering test", numHits1, numHits2);
+ }
+
+ public void testDefaultStopwordsAllFields() throws Exception {
+ protectedAnalyzer = new QueryAutoStopWordAnalyzer(TEST_VERSION_CURRENT, appAnalyzer, reader);
+ int numHits = search(protectedAnalyzer, "repetitiveField:boring");
+ assertEquals("Default filter should remove all docs", 0, numHits);
+ }
+
+ public void testStopwordsAllFieldsMaxPercentDocs() throws Exception {
+ protectedAnalyzer = new QueryAutoStopWordAnalyzer(TEST_VERSION_CURRENT, appAnalyzer, 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 = new QueryAutoStopWordAnalyzer(TEST_VERSION_CURRENT, appAnalyzer, 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 testStopwordsPerFieldMaxPercentDocs() throws Exception {
+ protectedAnalyzer = new QueryAutoStopWordAnalyzer(TEST_VERSION_CURRENT, appAnalyzer, reader, Arrays.asList("variedField"), 1f / 2f);
+ int numHits = search(protectedAnalyzer, "repetitiveField:boring");
+ assertTrue("A filter on one Field should not affect queris on another", numHits > 0);
+
+ protectedAnalyzer = new QueryAutoStopWordAnalyzer(TEST_VERSION_CURRENT, appAnalyzer, reader, Arrays.asList("variedField", "repetitiveField"), 1f / 2f);
+ numHits = search(protectedAnalyzer, "repetitiveField:boring");
+ assertEquals("A filter on the right Field should affect queries on it", numHits, 0);
+ }
+
+ public void testStopwordsPerFieldMaxDocFreq() throws Exception {
+ protectedAnalyzer = new QueryAutoStopWordAnalyzer(TEST_VERSION_CURRENT, appAnalyzer, reader, Arrays.asList("repetitiveField"), 10);
+ int numStopWords = protectedAnalyzer.getStopWords("repetitiveField").length;
+ assertTrue("Should have identified stop words", numStopWords > 0);
+
+ protectedAnalyzer = new QueryAutoStopWordAnalyzer(TEST_VERSION_CURRENT, appAnalyzer, reader, Arrays.asList("repetitiveField", "variedField"), 10);
+ int numNewStopWords = protectedAnalyzer.getStopWords("repetitiveField").length + protectedAnalyzer.getStopWords("variedField").length;
+ assertTrue("Should have identified more stop words", numNewStopWords > numStopWords);
+ }
+
+ public void testNoFieldNamePollution() throws Exception {
+ protectedAnalyzer = new QueryAutoStopWordAnalyzer(TEST_VERSION_CURRENT, appAnalyzer, reader, Arrays.asList("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 MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+ else
+ return new MockTokenizer(reader, MockTokenizer.SIMPLE, false);
+ }
+ }
+
+ public void testWrappingNonReusableAnalyzer() throws Exception {
+ QueryAutoStopWordAnalyzer a = new QueryAutoStopWordAnalyzer(TEST_VERSION_CURRENT, new NonreusableAnalyzer(), 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 MockAnalyzer(random, MockTokenizer.WHITESPACE, false), reader, 10);
+ TokenStream ts = a.tokenStream("repetitiveField", new StringReader("this boring"));
+ assertTokenStreamContents(ts, new String[] { "this" });
+ }
+}
fnp / pylucene.git / blobdiff