ShingleTokenFilterFactoryTests.java

/*
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 * distributed with this work for additional information
 * regarding copyright ownership. ElasticSearch 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
 *
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package org.elasticsearch.test.unit.index.analysis;

import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.WhitespaceTokenizer;
import org.apache.lucene.util.Version;
import org.elasticsearch.index.analysis.AnalysisService;
import org.elasticsearch.index.analysis.ShingleTokenFilterFactory;
import org.elasticsearch.index.analysis.TokenFilterFactory;
import org.testng.annotations.Test;

import java.io.IOException;
import java.io.StringReader;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.instanceOf;

public class ShingleTokenFilterFactoryTests {

    private static final String RESOURCE = "org/elasticsearch/test/unit/index/analysis/shingle_analysis.json";

    @Test
    public void testDefault() throws IOException {
        AnalysisService analysisService = AnalysisTestsHelper.createAnalysisServiceFromClassPath(RESOURCE);
        TokenFilterFactory tokenFilter = analysisService.tokenFilter("shingle");
        String source = "the quick brown fox";
        String[] expected = new String[]{"the", "the quick", "quick", "quick brown", "brown", "brown fox", "fox"};
        Tokenizer tokenizer = new WhitespaceTokenizer(Version.LUCENE_36, new StringReader(source));
        AnalysisTestsHelper.assertSimpleTSOutput(tokenFilter.create(tokenizer), expected);
    }

    @Test
    public void testInverseMapping() throws IOException {
        AnalysisService analysisService = AnalysisTestsHelper.createAnalysisServiceFromClassPath(RESOURCE);
        TokenFilterFactory tokenFilter = analysisService.tokenFilter("shingle_inverse");
        assertThat(tokenFilter, instanceOf(ShingleTokenFilterFactory.class));
        String source = "the quick brown fox";
        String[] expected = new String[]{"the_quick_brown", "quick_brown_fox"};
        Tokenizer tokenizer = new WhitespaceTokenizer(Version.LUCENE_36, new StringReader(source));
        AnalysisTestsHelper.assertSimpleTSOutput(tokenFilter.create(tokenizer), expected);
    }

    @Test
    public void testInverseMappingNoShingles() throws IOException {
        AnalysisService analysisService = AnalysisTestsHelper.createAnalysisServiceFromClassPath(RESOURCE);
        TokenFilterFactory tokenFilter = analysisService.tokenFilter("shingle_inverse");
        assertThat(tokenFilter, instanceOf(ShingleTokenFilterFactory.class));
        String source = "the quick";
        String[] expected = new String[]{"the", "quick"};
        Tokenizer tokenizer = new WhitespaceTokenizer(Version.LUCENE_36, new StringReader(source));
        AnalysisTestsHelper.assertSimpleTSOutput(tokenFilter.create(tokenizer), expected);
    }

}