Class GermanAnalyzer

  • All Implemented Interfaces:
    Closeable, AutoCloseable

    public final class GermanAnalyzer
    extends StopwordAnalyzerBase
    Analyzer for German language.

    Supports an external list of stopwords (words that will not be indexed at all) and an external list of exclusions (word that will not be stemmed, but indexed). A default set of stopwords is used unless an alternative list is specified, but the exclusion list is empty by default.

    You must specify the required Version compatibility when creating GermanAnalyzer:

    • As of 3.6, GermanLightStemFilter is used for less aggressive stemming.
    • As of 3.1, Snowball stemming is done with SnowballFilter, and Snowball stopwords are used by default.
    • As of 2.9, StopFilter preserves position increments

    NOTE: This class uses the same Version dependent settings as StandardAnalyzer.

    • Field Detail

      • DEFAULT_STOPWORD_FILE

        public static final String DEFAULT_STOPWORD_FILE
        File containing default German stopwords.
        See Also:
        Constant Field Values
    • Constructor Detail

      • GermanAnalyzer

        public GermanAnalyzer​(Version matchVersion)
        Builds an analyzer with the default stop words: getDefaultStopSet().
      • GermanAnalyzer

        public GermanAnalyzer​(Version matchVersion,
                              CharArraySet stopwords)
        Builds an analyzer with the given stop words
        Parameters:
        matchVersion - lucene compatibility version
        stopwords - a stopword set
      • GermanAnalyzer

        public GermanAnalyzer​(Version matchVersion,
                              CharArraySet stopwords,
                              CharArraySet stemExclusionSet)
        Builds an analyzer with the given stop words
        Parameters:
        matchVersion - lucene compatibility version
        stopwords - a stopword set
        stemExclusionSet - a stemming exclusion set
    • Method Detail

      • getDefaultStopSet

        public static final CharArraySet getDefaultStopSet()
        Returns a set of default German-stopwords
        Returns:
        a set of default German-stopwords