Examples with LowerCaseFilter org.apache.lucene.analysis.LowerCaseFilter used on opensource projects

Example 41 with LowerCaseFilter

use of org.apache.lucene.analysis.LowerCaseFilter in project elasticsearch by elastic.

the class NoisyChannelSpellCheckerTests method testNgram.

public void testNgram() throws IOException {
    RAMDirectory dir = new RAMDirectory();
    Map<String, Analyzer> mapping = new HashMap<>();
    mapping.put("body_ngram", new Analyzer() {

        @Override
        protected TokenStreamComponents createComponents(String fieldName) {
            Tokenizer t = new StandardTokenizer();
            ShingleFilter tf = new ShingleFilter(t, 2, 3);
            tf.setOutputUnigrams(false);
            return new TokenStreamComponents(t, new LowerCaseFilter(tf));
        }
    });
    mapping.put("body", new Analyzer() {

        @Override
        protected TokenStreamComponents createComponents(String fieldName) {
            Tokenizer t = new StandardTokenizer();
            return new TokenStreamComponents(t, new LowerCaseFilter(t));
        }
    });
    PerFieldAnalyzerWrapper wrapper = new PerFieldAnalyzerWrapper(new WhitespaceAnalyzer(), mapping);
    IndexWriterConfig conf = new IndexWriterConfig(wrapper);
    IndexWriter writer = new IndexWriter(dir, conf);
    String[] strings = new String[] { "Xorr the God-Jewel", "Grog the God-Crusher", "Xorn", "Walter Newell", "Wanda Maximoff", "Captain America", "American Ace", "USA Hero", "Wundarr the Aquarian", "Will o' the Wisp", "Xemnu the Titan", "Fantastic Four", "Quasar", "Quasar II" };
    for (String line : strings) {
        Document doc = new Document();
        doc.add(new Field("body", line, TextField.TYPE_NOT_STORED));
        doc.add(new Field("body_ngram", line, TextField.TYPE_NOT_STORED));
        writer.addDocument(doc);
    }
    DirectoryReader ir = DirectoryReader.open(writer);
    WordScorer wordScorer = new LaplaceScorer(ir, MultiFields.getTerms(ir, "body_ngram"), "body_ngram", 0.95d, new BytesRef(" "), 0.5f);
    NoisyChannelSpellChecker suggester = new NoisyChannelSpellChecker();
    DirectSpellChecker spellchecker = new DirectSpellChecker();
    spellchecker.setMinQueryLength(1);
    DirectCandidateGenerator generator = new DirectCandidateGenerator(spellchecker, "body", SuggestMode.SUGGEST_MORE_POPULAR, ir, 0.95, 5);
    Result result = suggester.getCorrections(wrapper, new BytesRef("american ame"), generator, 1, 1, ir, "body", wordScorer, 1, 2);
    Correction[] corrections = result.corrections;
    assertThat(corrections.length, equalTo(1));
    assertThat(corrections[0].join(space).utf8ToString(), equalTo("american ace"));
    assertThat(corrections[0].join(space, preTag, postTag).utf8ToString(), equalTo("american <em>ace</em>"));
    assertThat(result.cutoffScore, greaterThan(0d));
    result = suggester.getCorrections(wrapper, new BytesRef("american ame"), generator, 1, 1, ir, "body", wordScorer, 0, 1);
    corrections = result.corrections;
    assertThat(corrections.length, equalTo(1));
    assertThat(corrections[0].join(space).utf8ToString(), equalTo("american ame"));
    assertThat(corrections[0].join(space, preTag, postTag).utf8ToString(), equalTo("american ame"));
    assertThat(result.cutoffScore, equalTo(Double.MIN_VALUE));
    suggester = new NoisyChannelSpellChecker(0.85);
    wordScorer = new LaplaceScorer(ir, MultiFields.getTerms(ir, "body_ngram"), "body_ngram", 0.85d, new BytesRef(" "), 0.5f);
    corrections = suggester.getCorrections(wrapper, new BytesRef("Xor the Got-Jewel"), generator, 0.5f, 4, ir, "body", wordScorer, 0, 2).corrections;
    assertThat(corrections.length, equalTo(4));
    assertThat(corrections[0].join(space).utf8ToString(), equalTo("xorr the god jewel"));
    assertThat(corrections[1].join(space).utf8ToString(), equalTo("xor the god jewel"));
    assertThat(corrections[2].join(space).utf8ToString(), equalTo("xorn the god jewel"));
    assertThat(corrections[3].join(space).utf8ToString(), equalTo("xorr the got jewel"));
    assertThat(corrections[0].join(space, preTag, postTag).utf8ToString(), equalTo("<em>xorr</em> the <em>god</em> jewel"));
    assertThat(corrections[1].join(space, preTag, postTag).utf8ToString(), equalTo("xor the <em>god</em> jewel"));
    assertThat(corrections[2].join(space, preTag, postTag).utf8ToString(), equalTo("<em>xorn</em> the <em>god</em> jewel"));
    assertThat(corrections[3].join(space, preTag, postTag).utf8ToString(), equalTo("<em>xorr</em> the got jewel"));
    corrections = suggester.getCorrections(wrapper, new BytesRef("Xor the Got-Jewel"), generator, 0.5f, 4, ir, "body", wordScorer, 1, 2).corrections;
    assertThat(corrections.length, equalTo(4));
    assertThat(corrections[0].join(space).utf8ToString(), equalTo("xorr the god jewel"));
    assertThat(corrections[1].join(space).utf8ToString(), equalTo("xor the god jewel"));
    assertThat(corrections[2].join(space).utf8ToString(), equalTo("xorn the god jewel"));
    assertThat(corrections[3].join(space).utf8ToString(), equalTo("xorr the got jewel"));
    // Test some of the highlighting corner cases
    suggester = new NoisyChannelSpellChecker(0.85);
    wordScorer = new LaplaceScorer(ir, MultiFields.getTerms(ir, "body_ngram"), "body_ngram", 0.85d, new BytesRef(" "), 0.5f);
    corrections = suggester.getCorrections(wrapper, new BytesRef("Xor teh Got-Jewel"), generator, 4f, 4, ir, "body", wordScorer, 1, 2).corrections;
    assertThat(corrections.length, equalTo(4));
    assertThat(corrections[0].join(space).utf8ToString(), equalTo("xorr the god jewel"));
    assertThat(corrections[1].join(space).utf8ToString(), equalTo("xor the god jewel"));
    assertThat(corrections[2].join(space).utf8ToString(), equalTo("xorn the god jewel"));
    assertThat(corrections[3].join(space).utf8ToString(), equalTo("xor teh god jewel"));
    assertThat(corrections[0].join(space, preTag, postTag).utf8ToString(), equalTo("<em>xorr the god</em> jewel"));
    assertThat(corrections[1].join(space, preTag, postTag).utf8ToString(), equalTo("xor <em>the god</em> jewel"));
    assertThat(corrections[2].join(space, preTag, postTag).utf8ToString(), equalTo("<em>xorn the god</em> jewel"));
    assertThat(corrections[3].join(space, preTag, postTag).utf8ToString(), equalTo("xor teh <em>god</em> jewel"));
    // test synonyms
    Analyzer analyzer = new Analyzer() {

        @Override
        protected TokenStreamComponents createComponents(String fieldName) {
            Tokenizer t = new StandardTokenizer();
            TokenFilter filter = new LowerCaseFilter(t);
            try {
                SolrSynonymParser parser = new SolrSynonymParser(true, false, new WhitespaceAnalyzer());
                parser.parse(new StringReader("usa => usa, america, american"));
                filter = new SynonymFilter(filter, parser.build(), true);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
            return new TokenStreamComponents(t, filter);
        }
    };
    spellchecker.setAccuracy(0.0f);
    spellchecker.setMinPrefix(1);
    spellchecker.setMinQueryLength(1);
    suggester = new NoisyChannelSpellChecker(0.85);
    wordScorer = new LaplaceScorer(ir, MultiFields.getTerms(ir, "body_ngram"), "body_ngram", 0.85d, new BytesRef(" "), 0.5f);
    corrections = suggester.getCorrections(analyzer, new BytesRef("captian usa"), generator, 2, 4, ir, "body", wordScorer, 1, 2).corrections;
    assertThat(corrections[0].join(space).utf8ToString(), equalTo("captain america"));
    assertThat(corrections[0].join(space, preTag, postTag).utf8ToString(), equalTo("<em>captain america</em>"));
    generator = new DirectCandidateGenerator(spellchecker, "body", SuggestMode.SUGGEST_MORE_POPULAR, ir, 0.85, 10, null, analyzer, MultiFields.getTerms(ir, "body"));
    corrections = suggester.getCorrections(analyzer, new BytesRef("captian usw"), generator, 2, 4, ir, "body", wordScorer, 1, 2).corrections;
    assertThat(corrections[0].join(new BytesRef(" ")).utf8ToString(), equalTo("captain america"));
    assertThat(corrections[0].join(space, preTag, postTag).utf8ToString(), equalTo("<em>captain america</em>"));
    // Make sure that user supplied text is not marked as highlighted in the presence of a synonym filter
    generator = new DirectCandidateGenerator(spellchecker, "body", SuggestMode.SUGGEST_MORE_POPULAR, ir, 0.85, 10, null, analyzer, MultiFields.getTerms(ir, "body"));
    corrections = suggester.getCorrections(analyzer, new BytesRef("captain usw"), generator, 2, 4, ir, "body", wordScorer, 1, 2).corrections;
    assertThat(corrections[0].join(new BytesRef(" ")).utf8ToString(), equalTo("captain america"));
    assertThat(corrections[0].join(space, preTag, postTag).utf8ToString(), equalTo("captain <em>america</em>"));
}

Example 42 with LowerCaseFilter

use of org.apache.lucene.analysis.LowerCaseFilter in project elasticsearch by elastic.

the class NoisyChannelSpellCheckerTests method testTrigram.

public void testTrigram() throws IOException {
    RAMDirectory dir = new RAMDirectory();
    Map<String, Analyzer> mapping = new HashMap<>();
    mapping.put("body_ngram", new Analyzer() {

        @Override
        protected TokenStreamComponents createComponents(String fieldName) {
            Tokenizer t = new StandardTokenizer();
            ShingleFilter tf = new ShingleFilter(t, 2, 3);
            tf.setOutputUnigrams(false);
            return new TokenStreamComponents(t, new LowerCaseFilter(tf));
        }
    });
    mapping.put("body", new Analyzer() {

        @Override
        protected TokenStreamComponents createComponents(String fieldName) {
            Tokenizer t = new StandardTokenizer();
            return new TokenStreamComponents(t, new LowerCaseFilter(t));
        }
    });
    PerFieldAnalyzerWrapper wrapper = new PerFieldAnalyzerWrapper(new WhitespaceAnalyzer(), mapping);
    IndexWriterConfig conf = new IndexWriterConfig(wrapper);
    IndexWriter writer = new IndexWriter(dir, conf);
    String[] strings = new String[] { "Xorr the God-Jewel", "Grog the God-Crusher", "Xorn", "Walter Newell", "Wanda Maximoff", "Captain America", "American Ace", "USA Hero", "Wundarr the Aquarian", "Will o' the Wisp", "Xemnu the Titan", "Fantastic Four", "Quasar", "Quasar II" };
    for (String line : strings) {
        Document doc = new Document();
        doc.add(new Field("body", line, TextField.TYPE_NOT_STORED));
        doc.add(new Field("body_ngram", line, TextField.TYPE_NOT_STORED));
        writer.addDocument(doc);
    }
    DirectoryReader ir = DirectoryReader.open(writer);
    WordScorer wordScorer = new LinearInterpolatingScorer(ir, MultiFields.getTerms(ir, "body_ngram"), "body_ngram", 0.85d, new BytesRef(" "), 0.5, 0.4, 0.1);
    NoisyChannelSpellChecker suggester = new NoisyChannelSpellChecker();
    DirectSpellChecker spellchecker = new DirectSpellChecker();
    spellchecker.setMinQueryLength(1);
    DirectCandidateGenerator generator = new DirectCandidateGenerator(spellchecker, "body", SuggestMode.SUGGEST_MORE_POPULAR, ir, 0.95, 5);
    Correction[] corrections = suggester.getCorrections(wrapper, new BytesRef("american ame"), generator, 1, 1, ir, "body", wordScorer, 1, 3).corrections;
    assertThat(corrections.length, equalTo(1));
    assertThat(corrections[0].join(new BytesRef(" ")).utf8ToString(), equalTo("american ace"));
    corrections = suggester.getCorrections(wrapper, new BytesRef("american ame"), generator, 1, 1, ir, "body", wordScorer, 1, 1).corrections;
    assertThat(corrections.length, equalTo(0));
    //        assertThat(corrections[0].join(new BytesRef(" ")).utf8ToString(), equalTo("american ape"));
    wordScorer = new LinearInterpolatingScorer(ir, MultiFields.getTerms(ir, "body_ngram"), "body_ngram", 0.85d, new BytesRef(" "), 0.5, 0.4, 0.1);
    corrections = suggester.getCorrections(wrapper, new BytesRef("Xor the Got-Jewel"), generator, 0.5f, 4, ir, "body", wordScorer, 0, 3).corrections;
    assertThat(corrections.length, equalTo(4));
    assertThat(corrections[0].join(new BytesRef(" ")).utf8ToString(), equalTo("xorr the god jewel"));
    assertThat(corrections[1].join(new BytesRef(" ")).utf8ToString(), equalTo("xor the god jewel"));
    assertThat(corrections[2].join(new BytesRef(" ")).utf8ToString(), equalTo("xorn the god jewel"));
    assertThat(corrections[3].join(new BytesRef(" ")).utf8ToString(), equalTo("xorr the got jewel"));
    corrections = suggester.getCorrections(wrapper, new BytesRef("Xor the Got-Jewel"), generator, 0.5f, 4, ir, "body", wordScorer, 1, 3).corrections;
    assertThat(corrections.length, equalTo(4));
    assertThat(corrections[0].join(new BytesRef(" ")).utf8ToString(), equalTo("xorr the god jewel"));
    assertThat(corrections[1].join(new BytesRef(" ")).utf8ToString(), equalTo("xor the god jewel"));
    assertThat(corrections[2].join(new BytesRef(" ")).utf8ToString(), equalTo("xorn the god jewel"));
    assertThat(corrections[3].join(new BytesRef(" ")).utf8ToString(), equalTo("xorr the got jewel"));
    corrections = suggester.getCorrections(wrapper, new BytesRef("Xor the Got-Jewel"), generator, 0.5f, 1, ir, "body", wordScorer, 100, 3).corrections;
    assertThat(corrections.length, equalTo(1));
    assertThat(corrections[0].join(new BytesRef(" ")).utf8ToString(), equalTo("xorr the god jewel"));
    // test synonyms
    Analyzer analyzer = new Analyzer() {

        @Override
        protected TokenStreamComponents createComponents(String fieldName) {
            Tokenizer t = new StandardTokenizer();
            TokenFilter filter = new LowerCaseFilter(t);
            try {
                SolrSynonymParser parser = new SolrSynonymParser(true, false, new WhitespaceAnalyzer());
                parser.parse(new StringReader("usa => usa, america, american"));
                filter = new SynonymFilter(filter, parser.build(), true);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
            return new TokenStreamComponents(t, filter);
        }
    };
    spellchecker.setAccuracy(0.0f);
    spellchecker.setMinPrefix(1);
    spellchecker.setMinQueryLength(1);
    suggester = new NoisyChannelSpellChecker(0.95);
    wordScorer = new LinearInterpolatingScorer(ir, MultiFields.getTerms(ir, "body_ngram"), "body_ngram", 0.95d, new BytesRef(" "), 0.5, 0.4, 0.1);
    corrections = suggester.getCorrections(analyzer, new BytesRef("captian usa"), generator, 2, 4, ir, "body", wordScorer, 1, 3).corrections;
    assertThat(corrections[0].join(new BytesRef(" ")).utf8ToString(), equalTo("captain america"));
    generator = new DirectCandidateGenerator(spellchecker, "body", SuggestMode.SUGGEST_MORE_POPULAR, ir, 0.95, 10, null, analyzer, MultiFields.getTerms(ir, "body"));
    corrections = suggester.getCorrections(analyzer, new BytesRef("captian usw"), generator, 2, 4, ir, "body", wordScorer, 1, 3).corrections;
    assertThat(corrections[0].join(new BytesRef(" ")).utf8ToString(), equalTo("captain america"));
    wordScorer = new StupidBackoffScorer(ir, MultiFields.getTerms(ir, "body_ngram"), "body_ngram", 0.85d, new BytesRef(" "), 0.4);
    corrections = suggester.getCorrections(wrapper, new BytesRef("Xor the Got-Jewel"), generator, 0.5f, 2, ir, "body", wordScorer, 0, 3).corrections;
    assertThat(corrections.length, equalTo(2));
    assertThat(corrections[0].join(new BytesRef(" ")).utf8ToString(), equalTo("xorr the god jewel"));
    assertThat(corrections[1].join(new BytesRef(" ")).utf8ToString(), equalTo("xor the god jewel"));
}

Example 43 with LowerCaseFilter

use of org.apache.lucene.analysis.LowerCaseFilter in project elasticsearch by elastic.

the class KeywordFieldTypeTests method testTermQueryWithNormalizer.

public void testTermQueryWithNormalizer() {
    MappedFieldType ft = createDefaultFieldType();
    ft.setName("field");
    ft.setIndexOptions(IndexOptions.DOCS);
    Analyzer normalizer = new Analyzer() {

        @Override
        protected TokenStreamComponents createComponents(String fieldName) {
            Tokenizer in = new WhitespaceTokenizer();
            TokenFilter out = new LowerCaseFilter(in);
            return new TokenStreamComponents(in, out);
        }

        @Override
        protected TokenStream normalize(String fieldName, TokenStream in) {
            return new LowerCaseFilter(in);
        }
    };
    ft.setSearchAnalyzer(new NamedAnalyzer("my_normalizer", AnalyzerScope.INDEX, normalizer));
    assertEquals(new TermQuery(new Term("field", "foo bar")), ft.termQuery("fOo BaR", null));
    ft.setIndexOptions(IndexOptions.NONE);
    IllegalArgumentException e = expectThrows(IllegalArgumentException.class, () -> ft.termQuery("bar", null));
    assertEquals("Cannot search on field [field] since it is not indexed.", e.getMessage());
}

Example 44 with LowerCaseFilter

use of org.apache.lucene.analysis.LowerCaseFilter in project elasticsearch by elastic.

the class SnowballAnalyzer method createComponents.

/** Constructs a {@link StandardTokenizer} filtered by a {@link
      StandardFilter}, a {@link LowerCaseFilter}, a {@link StopFilter},
      and a {@link SnowballFilter} */
@Override
public TokenStreamComponents createComponents(String fieldName) {
    final Tokenizer tokenizer = new StandardTokenizer();
    TokenStream result = tokenizer;
    // remove the possessive 's for english stemmers
    if (name.equals("English") || name.equals("Porter") || name.equals("Lovins"))
        result = new EnglishPossessiveFilter(result);
    // Use a special lowercase filter for turkish, the stemmer expects it.
    if (name.equals("Turkish"))
        result = new TurkishLowerCaseFilter(result);
    else
        result = new LowerCaseFilter(result);
    if (stopSet != null)
        result = new StopFilter(result, stopSet);
    result = new SnowballFilter(result, name);
    return new TokenStreamComponents(tokenizer, result);
}

Example 45 with LowerCaseFilter

use of org.apache.lucene.analysis.LowerCaseFilter in project elasticsearch by elastic.

the class StandardHtmlStripAnalyzer method createComponents.

@Override
protected TokenStreamComponents createComponents(final String fieldName) {
    final Tokenizer src = new StandardTokenizer();
    TokenStream tok = new StandardFilter(src);
    tok = new LowerCaseFilter(tok);
    if (!stopwords.isEmpty()) {
        tok = new StopFilter(tok, stopwords);
    }
    return new TokenStreamComponents(src, tok);
}