| /* |
| * 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. |
| */ |
| package org.apache.lucene.analysis.ngram; |
| |
| import com.carrotsearch.randomizedtesting.generators.RandomStrings; |
| import java.io.IOException; |
| import java.io.StringReader; |
| import java.util.Arrays; |
| import org.apache.lucene.analysis.Analyzer; |
| import org.apache.lucene.analysis.BaseTokenStreamTestCase; |
| import org.apache.lucene.analysis.Tokenizer; |
| import org.apache.lucene.util.TestUtil; |
| |
| /** Tests {@link EdgeNGramTokenizer} for correctness. */ |
| public class TestEdgeNGramTokenizer extends BaseTokenStreamTestCase { |
| private StringReader input; |
| |
| @Override |
| public void setUp() throws Exception { |
| super.setUp(); |
| input = new StringReader("abcde"); |
| } |
| |
| public void testInvalidInput() throws Exception { |
| expectThrows( |
| IllegalArgumentException.class, |
| () -> { |
| new EdgeNGramTokenizer(0, 0).setReader(input); |
| }); |
| } |
| |
| public void testInvalidInput2() throws Exception { |
| expectThrows( |
| IllegalArgumentException.class, |
| () -> { |
| new EdgeNGramTokenizer(2, 1).setReader(input); |
| }); |
| } |
| |
| public void testInvalidInput3() throws Exception { |
| expectThrows( |
| IllegalArgumentException.class, |
| () -> { |
| new EdgeNGramTokenizer(-1, 2).setReader(input); |
| }); |
| } |
| |
| public void testFrontUnigram() throws Exception { |
| EdgeNGramTokenizer tokenizer = new EdgeNGramTokenizer(1, 1); |
| tokenizer.setReader(input); |
| assertTokenStreamContents( |
| tokenizer, new String[] {"a"}, new int[] {0}, new int[] {1}, 5 /* abcde */); |
| } |
| |
| public void testOversizedNgrams() throws Exception { |
| EdgeNGramTokenizer tokenizer = new EdgeNGramTokenizer(6, 6); |
| tokenizer.setReader(input); |
| ; |
| assertTokenStreamContents(tokenizer, new String[0], new int[0], new int[0], 5 /* abcde */); |
| } |
| |
| public void testFrontRangeOfNgrams() throws Exception { |
| EdgeNGramTokenizer tokenizer = new EdgeNGramTokenizer(1, 3); |
| tokenizer.setReader(input); |
| assertTokenStreamContents( |
| tokenizer, |
| new String[] {"a", "ab", "abc"}, |
| new int[] {0, 0, 0}, |
| new int[] {1, 2, 3}, |
| 5 /* abcde */); |
| } |
| |
| public void testReset() throws Exception { |
| EdgeNGramTokenizer tokenizer = new EdgeNGramTokenizer(1, 3); |
| tokenizer.setReader(input); |
| assertTokenStreamContents( |
| tokenizer, |
| new String[] {"a", "ab", "abc"}, |
| new int[] {0, 0, 0}, |
| new int[] {1, 2, 3}, |
| 5 /* abcde */); |
| tokenizer.setReader(new StringReader("abcde")); |
| assertTokenStreamContents( |
| tokenizer, |
| new String[] {"a", "ab", "abc"}, |
| new int[] {0, 0, 0}, |
| new int[] {1, 2, 3}, |
| 5 /* abcde */); |
| } |
| |
| /** blast some random strings through the analyzer */ |
| public void testRandomStrings() throws Exception { |
| int numIters = TEST_NIGHTLY ? 10 : 1; |
| for (int i = 0; i < numIters; i++) { |
| final int min = TestUtil.nextInt(random(), 2, 10); |
| final int max = TestUtil.nextInt(random(), min, 20); |
| |
| Analyzer a = |
| new Analyzer() { |
| @Override |
| protected TokenStreamComponents createComponents(String fieldName) { |
| Tokenizer tokenizer = new EdgeNGramTokenizer(min, max); |
| return new TokenStreamComponents(tokenizer, tokenizer); |
| } |
| }; |
| checkRandomData(random(), a, 100 * RANDOM_MULTIPLIER, 20); |
| checkRandomData(random(), a, 10 * RANDOM_MULTIPLIER, 8192); |
| a.close(); |
| } |
| } |
| |
| public void testTokenizerPositions() throws Exception { |
| EdgeNGramTokenizer tokenizer = new EdgeNGramTokenizer(1, 3); |
| tokenizer.setReader(new StringReader("abcde")); |
| assertTokenStreamContents( |
| tokenizer, |
| new String[] {"a", "ab", "abc"}, |
| new int[] {0, 0, 0}, |
| new int[] {1, 2, 3}, |
| null, |
| new int[] {1, 1, 1}, |
| null, |
| null, |
| false); |
| } |
| |
| private static void testNGrams(int minGram, int maxGram, int length, final String nonTokenChars) |
| throws IOException { |
| final String s = RandomStrings.randomAsciiLettersOfLengthBetween(random(), length, length); |
| testNGrams(minGram, maxGram, s, nonTokenChars); |
| } |
| |
| private static void testNGrams(int minGram, int maxGram, String s, String nonTokenChars) |
| throws IOException { |
| TestNGramTokenizer.testNGrams(minGram, maxGram, s, nonTokenChars, true); |
| } |
| |
| public void testLargeInput() throws IOException { |
| // test sliding |
| final int minGram = TestUtil.nextInt(random(), 1, 100); |
| final int maxGram = TestUtil.nextInt(random(), minGram, 100); |
| testNGrams(minGram, maxGram, TestUtil.nextInt(random(), 3 * 1024, 4 * 1024), ""); |
| } |
| |
| public void testLargeMaxGram() throws IOException { |
| // test sliding with maxGram > 1024 |
| final int minGram = TestUtil.nextInt(random(), 1290, 1300); |
| final int maxGram = TestUtil.nextInt(random(), minGram, 1300); |
| testNGrams(minGram, maxGram, TestUtil.nextInt(random(), 3 * 1024, 4 * 1024), ""); |
| } |
| |
| public void testPreTokenization() throws IOException { |
| final int minGram = TestUtil.nextInt(random(), 1, 100); |
| final int maxGram = TestUtil.nextInt(random(), minGram, 100); |
| testNGrams(minGram, maxGram, TestUtil.nextInt(random(), 0, 4 * 1024), "a"); |
| } |
| |
| public void testHeavyPreTokenization() throws IOException { |
| final int minGram = TestUtil.nextInt(random(), 1, 100); |
| final int maxGram = TestUtil.nextInt(random(), minGram, 100); |
| testNGrams(minGram, maxGram, TestUtil.nextInt(random(), 0, 4 * 1024), "abcdef"); |
| } |
| |
| public void testFewTokenChars() throws IOException { |
| final char[] chrs = new char[TestUtil.nextInt(random(), 4000, 5000)]; |
| Arrays.fill(chrs, ' '); |
| for (int i = 0; i < chrs.length; ++i) { |
| if (random().nextFloat() < 0.1) { |
| chrs[i] = 'a'; |
| } |
| } |
| final int minGram = TestUtil.nextInt(random(), 1, 2); |
| final int maxGram = TestUtil.nextInt(random(), minGram, 2); |
| testNGrams(minGram, maxGram, new String(chrs), " "); |
| } |
| |
| public void testFullUTF8Range() throws IOException { |
| final int minGram = TestUtil.nextInt(random(), 1, 100); |
| final int maxGram = TestUtil.nextInt(random(), minGram, 100); |
| final String s = TestUtil.randomUnicodeString(random(), 4 * 1024); |
| testNGrams(minGram, maxGram, s, ""); |
| testNGrams(minGram, maxGram, s, "abcdef"); |
| } |
| } |