--- /dev/null
+package org.apache.lucene.analysis;
+
+/**
+ * Copyright 2005 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 org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
+import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
+import org.apache.lucene.util.English;
+import org.apache.lucene.util.Version;
+
+import java.io.IOException;
+import java.io.StringReader;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Set;
+import java.util.HashSet;
+
+import org.apache.lucene.analysis.BaseTokenStreamTestCase;
+import org.apache.lucene.analysis.MockTokenizer;
+import org.apache.lucene.analysis.TokenStream;
+
+public class TestStopFilter extends BaseTokenStreamTestCase {
+
+ // other StopFilter functionality is already tested by TestStopAnalyzer
+
+ public void testExactCase() throws IOException {
+ StringReader reader = new StringReader("Now is The Time");
+ Set<String> stopWords = new HashSet<String>(Arrays.asList("is", "the", "Time"));
+ TokenStream stream = new StopFilter(TEST_VERSION_CURRENT, new MockTokenizer(reader, MockTokenizer.WHITESPACE, false), stopWords, false);
+ assertTokenStreamContents(stream, new String[] { "Now", "The" });
+ }
+
+ public void testIgnoreCase() throws IOException {
+ StringReader reader = new StringReader("Now is The Time");
+ Set<Object> stopWords = new HashSet<Object>(Arrays.asList( "is", "the", "Time" ));
+ TokenStream stream = new StopFilter(TEST_VERSION_CURRENT, new MockTokenizer(reader, MockTokenizer.WHITESPACE, false), stopWords, true);
+ assertTokenStreamContents(stream, new String[] { "Now" });
+ }
+
+ public void testStopFilt() throws IOException {
+ StringReader reader = new StringReader("Now is The Time");
+ String[] stopWords = new String[] { "is", "the", "Time" };
+ Set<Object> stopSet = StopFilter.makeStopSet(TEST_VERSION_CURRENT, stopWords);
+ TokenStream stream = new StopFilter(TEST_VERSION_CURRENT, new MockTokenizer(reader, MockTokenizer.WHITESPACE, false), stopSet);
+ assertTokenStreamContents(stream, new String[] { "Now", "The" });
+ }
+
+ /**
+ * Test Position increments applied by StopFilter with and without enabling this option.
+ */
+ public void testStopPositons() throws IOException {
+ StringBuilder sb = new StringBuilder();
+ ArrayList<String> a = new ArrayList<String>();
+ for (int i=0; i<20; i++) {
+ String w = English.intToEnglish(i).trim();
+ sb.append(w).append(" ");
+ if (i%3 != 0) a.add(w);
+ }
+ log(sb.toString());
+ String stopWords[] = a.toArray(new String[0]);
+ for (int i=0; i<a.size(); i++) log("Stop: "+stopWords[i]);
+ Set<Object> stopSet = StopFilter.makeStopSet(TEST_VERSION_CURRENT, stopWords);
+ // with increments
+ StringReader reader = new StringReader(sb.toString());
+ StopFilter stpf = new StopFilter(Version.LUCENE_24, new MockTokenizer(reader, MockTokenizer.WHITESPACE, false), stopSet);
+ doTestStopPositons(stpf,true);
+ // without increments
+ reader = new StringReader(sb.toString());
+ stpf = new StopFilter(TEST_VERSION_CURRENT, new MockTokenizer(reader, MockTokenizer.WHITESPACE, false), stopSet);
+ doTestStopPositons(stpf,false);
+ // with increments, concatenating two stop filters
+ ArrayList<String> a0 = new ArrayList<String>();
+ ArrayList<String> a1 = new ArrayList<String>();
+ for (int i=0; i<a.size(); i++) {
+ if (i%2==0) {
+ a0.add(a.get(i));
+ } else {
+ a1.add(a.get(i));
+ }
+ }
+ String stopWords0[] = a0.toArray(new String[0]);
+ for (int i=0; i<a0.size(); i++) log("Stop0: "+stopWords0[i]);
+ String stopWords1[] = a1.toArray(new String[0]);
+ for (int i=0; i<a1.size(); i++) log("Stop1: "+stopWords1[i]);
+ Set<Object> stopSet0 = StopFilter.makeStopSet(TEST_VERSION_CURRENT, stopWords0);
+ Set<Object> stopSet1 = StopFilter.makeStopSet(TEST_VERSION_CURRENT, stopWords1);
+ reader = new StringReader(sb.toString());
+ StopFilter stpf0 = new StopFilter(TEST_VERSION_CURRENT, new MockTokenizer(reader, MockTokenizer.WHITESPACE, false), stopSet0); // first part of the set
+ stpf0.setEnablePositionIncrements(true);
+ StopFilter stpf01 = new StopFilter(TEST_VERSION_CURRENT, stpf0, stopSet1); // two stop filters concatenated!
+ doTestStopPositons(stpf01,true);
+ }
+
+ private void doTestStopPositons(StopFilter stpf, boolean enableIcrements) throws IOException {
+ log("---> test with enable-increments-"+(enableIcrements?"enabled":"disabled"));
+ stpf.setEnablePositionIncrements(enableIcrements);
+ CharTermAttribute termAtt = stpf.getAttribute(CharTermAttribute.class);
+ PositionIncrementAttribute posIncrAtt = stpf.getAttribute(PositionIncrementAttribute.class);
+ stpf.reset();
+ for (int i=0; i<20; i+=3) {
+ assertTrue(stpf.incrementToken());
+ log("Token "+i+": "+stpf);
+ String w = English.intToEnglish(i).trim();
+ assertEquals("expecting token "+i+" to be "+w,w,termAtt.toString());
+ assertEquals("all but first token must have position increment of 3",enableIcrements?(i==0?1:3):1,posIncrAtt.getPositionIncrement());
+ }
+ assertFalse(stpf.incrementToken());
+ stpf.end();
+ stpf.close();
+ }
+
+ // print debug info depending on VERBOSE
+ private static void log(String s) {
+ if (VERBOSE) {
+ System.out.println(s);
+ }
+ }
+}
fnp / pylucene.git / blobdiff