org.apache.lucene.analysis.synonym.SynonymFilter Java Examples

public void testMaxPosition3WithSynomyms() throws IOException {
  for (final boolean consumeAll : new boolean[]{true, false}) {
    MockTokenizer tokenizer = whitespaceMockTokenizer("one two three four five");
    // if we are consuming all tokens, we can use the checks, otherwise we can't
    tokenizer.setEnableChecks(consumeAll);

    SynonymMap.Builder builder = new SynonymMap.Builder(true);
    builder.add(new CharsRef("one"), new CharsRef("first"), true);
    builder.add(new CharsRef("one"), new CharsRef("alpha"), true);
    builder.add(new CharsRef("one"), new CharsRef("beguine"), true);
    CharsRefBuilder multiWordCharsRef = new CharsRefBuilder();
    SynonymMap.Builder.join(new String[]{"and", "indubitably", "single", "only"}, multiWordCharsRef);
    builder.add(new CharsRef("one"), multiWordCharsRef.get(), true);
    SynonymMap.Builder.join(new String[]{"dopple", "ganger"}, multiWordCharsRef);
    builder.add(new CharsRef("two"), multiWordCharsRef.get(), true);
    SynonymMap synonymMap = builder.build();
    @SuppressWarnings("deprecation")
    TokenStream stream = new SynonymFilter(tokenizer, synonymMap, true);
    stream = new LimitTokenPositionFilter(stream, 3, consumeAll);

    // "only", the 4th word of multi-word synonym "and indubitably single only" is not emitted, since its position is greater than 3.
    assertTokenStreamContents(stream,
        new String[]{"one", "first", "alpha", "beguine", "and", "two", "indubitably", "dopple", "three", "single", "ganger"},
        new int[]{1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0});
  }
}
 

@Override
public TokenFilterFactory getChainAwareTokenFilterFactory(TokenizerFactory tokenizer, List<CharFilterFactory> charFilters,
                                                          List<TokenFilterFactory> previousTokenFilters,
                                                          Function<String, TokenFilterFactory> allFilters) {
    final Analyzer analyzer = buildSynonymAnalyzer(tokenizer, charFilters, previousTokenFilters);
    final SynonymMap synonyms = buildSynonyms(analyzer, getRulesFromSettings(environment));
    final String name = name();
    return new TokenFilterFactory() {
        @Override
        public String name() {
            return name;
        }

        @Override
        public TokenStream create(TokenStream tokenStream) {
            return synonyms.fst == null ? tokenStream : new SynonymFilter(tokenStream, synonyms, false);
        }
    };
}
 

@Test
public void testWithSynonym() throws Exception {
  SynonymMap.Builder builder = new SynonymMap.Builder(true);
  builder.add(new CharsRef("mykeyword"), new CharsRef("mysynonym"), true);
  Tokenizer tokenizer = new MockTokenizer(MockTokenizer.WHITESPACE, true);
  tokenizer.setReader(new StringReader("mykeyword"));
  @SuppressWarnings("deprecation")
  SynonymFilter filter = new SynonymFilter(tokenizer, builder.build(), true);
  ConcatenateGraphFilter stream = new ConcatenateGraphFilter(filter);
  assertTokenStreamContents(stream, new String[] {"mykeyword", "mysynonym"}, null, null, new int[] { 1, 0 });
}
 

@Test
public void testWithSynonyms() throws Exception {
  SynonymMap.Builder builder = new SynonymMap.Builder(true);
  builder.add(new CharsRef("mykeyword"), new CharsRef("mysynonym"), true);
  Tokenizer tokenStream = new MockTokenizer(MockTokenizer.WHITESPACE, true);
  String input = "mykeyword another keyword";
  tokenStream.setReader(new StringReader(input));
  @SuppressWarnings("deprecation")
  SynonymFilter filter = new SynonymFilter(tokenStream, builder.build(), true);
  ConcatenateGraphFilter stream = new ConcatenateGraphFilter(filter, SEP_LABEL, false, 100);
  String[] expectedOutputs = new String[2];
  CharsRefBuilder expectedOutput = new CharsRefBuilder();
  expectedOutput.append("mykeyword");
  expectedOutput.append(SEP_LABEL);
  expectedOutput.append("another");
  expectedOutput.append(SEP_LABEL);
  expectedOutput.append("keyword");
  expectedOutputs[0] = expectedOutput.toCharsRef().toString();
  expectedOutput.clear();
  expectedOutput.append("mysynonym");
  expectedOutput.append(SEP_LABEL);
  expectedOutput.append("another");
  expectedOutput.append(SEP_LABEL);
  expectedOutput.append("keyword");
  expectedOutputs[1] = expectedOutput.toCharsRef().toString();
  assertTokenStreamContents(stream, expectedOutputs, null, null, new int[]{1, 0});
}
 

@Test
public void testValidNumberOfExpansions() throws IOException {
  SynonymMap.Builder builder = new SynonymMap.Builder(true);
  for (int i = 0; i < 256; i++) {
    builder.add(new CharsRef("" + (i+1)), new CharsRef("" + (1000 + (i+1))), true);
  }
  StringBuilder valueBuilder = new StringBuilder();
  for (int i = 0 ; i < 8 ; i++) {
    valueBuilder.append(i+1);
    valueBuilder.append(" ");
  }
  MockTokenizer tokenizer = new MockTokenizer(MockTokenizer.WHITESPACE, true);
  tokenizer.setReader(new StringReader(valueBuilder.toString()));
  @SuppressWarnings("deprecation")
  SynonymFilter filter = new SynonymFilter(tokenizer, builder.build(), true);

  int count;
  try (ConcatenateGraphFilter stream = new ConcatenateGraphFilter(filter)) {
    stream.reset();
    ConcatenateGraphFilter.BytesRefBuilderTermAttribute attr = stream.addAttribute(ConcatenateGraphFilter.BytesRefBuilderTermAttribute.class);
    count = 0;
    while (stream.incrementToken()) {
      count++;
      assertNotNull(attr.getBytesRef());
      assertTrue(attr.getBytesRef().length > 0);
    }
  }
  assertEquals(count, 256);
}
 

@Override
public TokenStream create(TokenStream tokenStream) {
    // fst is null means no synonyms
    return synonymMap.fst == null ? tokenStream : new SynonymFilter(tokenStream, synonymMap, ignoreCase);
}