de.unihildesheim.iw.lucene.analyzer.FrenchAnalyzerTest.java Source code

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Here is the source code for de.unihildesheim.iw.lucene.analyzer.FrenchAnalyzerTest.java

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/*
 * Copyright (C) 2015 Jens Bertram (code@jens-bertram.net)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package de.unihildesheim.iw.lucene.analyzer;

import de.unihildesheim.iw.TestCase;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.util.CharArraySet;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.BytesRefArray;
import org.apache.lucene.util.BytesRefIterator;
import org.apache.lucene.util.Counter;
import org.junit.Assert;
import org.junit.Test;
import org.slf4j.LoggerFactory;

import java.util.Arrays;

/**
 * Test for {@link FrenchAnalyzer}.
 *
 * @author Jens Bertram
 */
@SuppressWarnings("JavaDoc")
public class FrenchAnalyzerTest extends TestCase {
    public FrenchAnalyzerTest() {
        super(LoggerFactory.getLogger(FrenchAnalyzerTest.class));
    }

    @SuppressWarnings({ "resource", "ObjectAllocationInLoop", "ImplicitNumericConversion" })
    @Test
    public void testTokenStream_noStopwords() throws Exception {
        final String query = "foo bar baz bam";
        final Analyzer analyzer = new FrenchAnalyzer();
        final BytesRefArray result = new BytesRefArray(Counter.newCounter(false));

        try (TokenStream stream = analyzer.tokenStream(null, query)) {
            stream.reset();
            while (stream.incrementToken()) {
                final BytesRef term = new BytesRef(stream.getAttribute(CharTermAttribute.class));
                if (term.length > 0) {
                    result.append(term);
                }
            }
        }

        Assert.assertEquals("Not all terms returned.", 4L, result.size());

        final BytesRefIterator bri = result.iterator();
        BytesRef term;
        while ((term = bri.next()) != null) {
            Assert.assertTrue("Unknown term found.",
                    "foo".equals(term.utf8ToString()) || "bar".equals(term.utf8ToString())
                            || "baz".equals(term.utf8ToString()) || "bam".equals(term.utf8ToString()));
        }
    }

    @SuppressWarnings({ "resource", "ObjectAllocationInLoop", "ImplicitNumericConversion" })
    @Test
    public void testTokenStream() throws Exception {
        final CharArraySet csa = new CharArraySet(Arrays.asList("foo", "bar"), true);
        final String query = "foo bar baz bam";
        final Analyzer analyzer = new FrenchAnalyzer(csa);
        final BytesRefArray result = new BytesRefArray(Counter.newCounter(false));

        try (TokenStream stream = analyzer.tokenStream(null, query)) {
            stream.reset();
            while (stream.incrementToken()) {
                final BytesRef term = new BytesRef(stream.getAttribute(CharTermAttribute.class));
                if (term.length > 0) {
                    result.append(term);
                }
            }
        }

        Assert.assertEquals("Not all terms returned.", 2L, result.size());

        final BytesRefIterator bri = result.iterator();
        BytesRef term;
        while ((term = bri.next()) != null) {
            Assert.assertTrue("Unknown term found.",
                    "baz".equals(term.utf8ToString()) || "bam".equals(term.utf8ToString()));
        }
    }

    @SuppressWarnings({ "resource", "ObjectAllocationInLoop", "ImplicitNumericConversion" })
    @Test
    public void testTokenStream_elisions() throws Exception {
        final CharArraySet csa = new CharArraySet(Arrays.asList("foo", "bar"), true);
        final StringBuilder query = new StringBuilder("foo bar baz bam ");
        // add all elisions to the query
        for (final String s : FrenchAnalyzer.DEFAULT_ELISIONS) {
            query.append(s).append("\'bim ");
        }
        final Analyzer analyzer = new FrenchAnalyzer(csa);
        final BytesRefArray result = new BytesRefArray(Counter.newCounter(false));

        try (TokenStream stream = analyzer.tokenStream(null, query.toString())) {
            stream.reset();
            while (stream.incrementToken()) {
                final BytesRef term = new BytesRef(stream.getAttribute(CharTermAttribute.class));
                if (term.length > 0) {
                    result.append(term);
                }
            }
        }

        Assert.assertEquals("Not all terms returned.", 2L + FrenchAnalyzer.DEFAULT_ELISIONS.length, result.size());

        final BytesRefIterator bri = result.iterator();
        BytesRef term;
        while ((term = bri.next()) != null) {
            Assert.assertTrue("Unknown term found.",
                    "baz".equals(term.utf8ToString()) || "bam".equals(term.utf8ToString()) ||
                    // elisions should be removed from this
                            "bim".equals(term.utf8ToString()));
        }
    }
}