- * Supports an external list of stopwords (words - * that will not be indexed at all). - * A default set of stopwords is used unless an alternative list is specified. - *
- * - * - *You must specify the required {@link Version} - * compatibility when creating GreekAnalyzer: - *
NOTE: This class uses the same {@link Version} - * dependent settings as {@link StandardAnalyzer}.
- */ -public final class GreekAnalyzer extends StopwordAnalyzerBase { - /** File containing default Greek stopwords. */ - public final static String DEFAULT_STOPWORD_FILE = "stopwords.txt"; - - /** - * Returns a set of default Greek-stopwords - * @return a set of default Greek-stopwords - */ - public static final Set getDefaultStopSet(){ - return DefaultSetHolder.DEFAULT_SET; - } - - private static class DefaultSetHolder { - private static final Set DEFAULT_SET; - - static { - try { - DEFAULT_SET = loadStopwordSet(false, GreekAnalyzer.class, DEFAULT_STOPWORD_FILE, "#"); - } catch (IOException ex) { - // default set should always be present as it is part of the - // distribution (JAR) - throw new RuntimeException("Unable to load default stopword set"); - } - } - } - - /** - * Builds an analyzer with the default stop words. - * @param matchVersion Lucene compatibility version, - * See above - */ - public GreekAnalyzer(Version matchVersion) { - this(matchVersion, DefaultSetHolder.DEFAULT_SET); - } - - /** - * Builds an analyzer with the given stop words. - *- * NOTE: The stopwords set should be pre-processed with the logic of - * {@link GreekLowerCaseFilter} for best results. - * - * @param matchVersion Lucene compatibility version, - * See above - * @param stopwords a stopword set - */ - public GreekAnalyzer(Version matchVersion, Set stopwords) { - super(matchVersion, stopwords); - } - - /** - * Builds an analyzer with the given stop words. - * @param stopwords Array of stopwords to use. - * @deprecated use {@link #GreekAnalyzer(Version, Set)} instead - */ - @Deprecated - public GreekAnalyzer(Version matchVersion, String... stopwords) { - this(matchVersion, StopFilter.makeStopSet(matchVersion, stopwords)); - } - - /** - * Builds an analyzer with the given stop words. - * @deprecated use {@link #GreekAnalyzer(Version, Set)} instead - */ - @Deprecated - public GreekAnalyzer(Version matchVersion, Map stopwords) { - this(matchVersion, stopwords.keySet()); - } - - /** - * Creates - * {@link org.apache.lucene.analysis.ReusableAnalyzerBase.TokenStreamComponents} - * used to tokenize all the text in the provided {@link Reader}. - * - * @return {@link org.apache.lucene.analysis.ReusableAnalyzerBase.TokenStreamComponents} - * built from a {@link StandardTokenizer} filtered with - * {@link GreekLowerCaseFilter}, {@link StandardFilter}, - * {@link StopFilter}, and {@link GreekStemFilter} - */ - @Override - protected TokenStreamComponents createComponents(String fieldName, - Reader reader) { - final Tokenizer source = new StandardTokenizer(matchVersion, reader); - TokenStream result = new GreekLowerCaseFilter(matchVersion, source); - if (matchVersion.onOrAfter(Version.LUCENE_31)) - result = new StandardFilter(matchVersion, result); - result = new StopFilter(matchVersion, result, stopwords); - if (matchVersion.onOrAfter(Version.LUCENE_31)) - result = new GreekStemFilter(result); - return new TokenStreamComponents(source, result); - } -}