| package org.apache.lucene.analysis.ngram; |
| |
| /** |
| * 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.Tokenizer; |
| |
| /** |
| * Tests {@link NGramTokenizer} for correctness. |
| */ |
| public class NGramTokenizerTest extends BaseTokenStreamTestCase { |
| private StringReader input; |
| |
| @Override |
| public void setUp() throws Exception { |
| super.setUp(); |
| input = new StringReader("abcde"); |
| } |
| |
| public void testInvalidInput() throws Exception { |
| boolean gotException = false; |
| try { |
| new NGramTokenizer(input, 2, 1); |
| } catch (IllegalArgumentException e) { |
| gotException = true; |
| } |
| assertTrue(gotException); |
| } |
| |
| public void testInvalidInput2() throws Exception { |
| boolean gotException = false; |
| try { |
| new NGramTokenizer(input, 0, 1); |
| } catch (IllegalArgumentException e) { |
| gotException = true; |
| } |
| assertTrue(gotException); |
| } |
| |
| public void testUnigrams() throws Exception { |
| NGramTokenizer tokenizer = new NGramTokenizer(input, 1, 1); |
| assertTokenStreamContents(tokenizer, new String[]{"a","b","c","d","e"}, new int[]{0,1,2,3,4}, new int[]{1,2,3,4,5}, 5 /* abcde */); |
| } |
| |
| public void testBigrams() throws Exception { |
| NGramTokenizer tokenizer = new NGramTokenizer(input, 2, 2); |
| assertTokenStreamContents(tokenizer, new String[]{"ab","bc","cd","de"}, new int[]{0,1,2,3}, new int[]{2,3,4,5}, 5 /* abcde */); |
| } |
| |
| public void testNgrams() throws Exception { |
| NGramTokenizer tokenizer = new NGramTokenizer(input, 1, 3); |
| assertTokenStreamContents(tokenizer, |
| new String[]{"a","b","c","d","e", "ab","bc","cd","de", "abc","bcd","cde"}, |
| new int[]{0,1,2,3,4, 0,1,2,3, 0,1,2}, |
| new int[]{1,2,3,4,5, 2,3,4,5, 3,4,5}, |
| null, |
| null, |
| null, |
| 5 /* abcde */, |
| false |
| ); |
| } |
| |
| public void testOversizedNgrams() throws Exception { |
| NGramTokenizer tokenizer = new NGramTokenizer(input, 6, 7); |
| assertTokenStreamContents(tokenizer, new String[0], new int[0], new int[0], 5 /* abcde */); |
| } |
| |
| public void testReset() throws Exception { |
| NGramTokenizer tokenizer = new NGramTokenizer(input, 1, 1); |
| assertTokenStreamContents(tokenizer, new String[]{"a","b","c","d","e"}, new int[]{0,1,2,3,4}, new int[]{1,2,3,4,5}, 5 /* abcde */); |
| tokenizer.reset(new StringReader("abcde")); |
| assertTokenStreamContents(tokenizer, new String[]{"a","b","c","d","e"}, new int[]{0,1,2,3,4}, new int[]{1,2,3,4,5}, 5 /* abcde */); |
| } |
| |
| /** blast some random strings through the analyzer */ |
| public void testRandomStrings() throws Exception { |
| Analyzer a = new Analyzer() { |
| @Override |
| protected TokenStreamComponents createComponents(String fieldName, Reader reader) { |
| Tokenizer tokenizer = new NGramTokenizer(reader, 2, 15); |
| return new TokenStreamComponents(tokenizer, tokenizer); |
| } |
| }; |
| checkRandomData(random, a, 10000*RANDOM_MULTIPLIER, 20, false, false); |
| checkRandomData(random, a, 200*RANDOM_MULTIPLIER, 8192, false, false); |
| } |
| } |