/*
* 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 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;
import com.carrotsearch.randomizedtesting.generators.RandomStrings;
/**
* Tests {@link EdgeNGramTokenizer} for correctness.
*/
public class EdgeNGramTokenizerTest 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.randomAsciiOfLength(random(), length);
testNGrams(minGram, maxGram, s, nonTokenChars);
}
private static void testNGrams(int minGram, int maxGram, String s, String nonTokenChars) throws IOException {
NGramTokenizerTest.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");
}
}