org.apache.lucene.analysis.de
Class GermanAnalyzer

java.lang.Object
  org.apache.lucene.analysis.Analyzer
      org.apache.lucene.analysis.de.GermanAnalyzer

public class GermanAnalyzer
extends Analyzer

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, the exclusion list is empty by default.

Version:

$Id: GermanAnalyzer.java 692921 2008-09-07 19:22:40Z mikemccand $

Field Summary

static String[]

GERMAN_STOP_WORDS List of typical german stopwords.

Constructor Summary

GermanAnalyzer()
Builds an analyzer with the default stop words (GERMAN_STOP_WORDS).

GermanAnalyzer(File stopwords)
Builds an analyzer with the given stop words.

GermanAnalyzer(Map stopwords)
Builds an analyzer with the given stop words.

GermanAnalyzer(String[] stopwords)
Builds an analyzer with the given stop words.

Method Summary

void	setStemExclusionTable(File exclusionlist) Builds an exclusionlist from the words contained in the given file.
void	setStemExclusionTable(Map exclusionlist) Builds an exclusionlist from a Hashtable.
void	setStemExclusionTable(String[] exclusionlist) Builds an exclusionlist from an array of Strings.
TokenStream	tokenStream(String fieldName, Reader reader) Creates a TokenStream which tokenizes all the text in the provided Reader.

Methods inherited from class org.apache.lucene.analysis.Analyzer

getPositionIncrementGap, getPreviousTokenStream, reusableTokenStream, setPreviousTokenStream

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

GERMAN_STOP_WORDS

public static final String[] GERMAN_STOP_WORDS

List of typical german stopwords.

Constructor Detail

GermanAnalyzer

public GermanAnalyzer()

Builds an analyzer with the default stop words (GERMAN_STOP_WORDS).

GermanAnalyzer

public GermanAnalyzer(String[] stopwords)

Builds an analyzer with the given stop words.

GermanAnalyzer

public GermanAnalyzer(Map stopwords)

Builds an analyzer with the given stop words.

GermanAnalyzer

public GermanAnalyzer(File stopwords)
               throws IOException

Builds an analyzer with the given stop words.

Throws:

IOException

Method Detail

setStemExclusionTable

public void setStemExclusionTable(String[] exclusionlist)

Builds an exclusionlist from an array of Strings.

setStemExclusionTable

public void setStemExclusionTable(Map exclusionlist)

Builds an exclusionlist from a Hashtable.

setStemExclusionTable

public void setStemExclusionTable(File exclusionlist)
                           throws IOException

Builds an exclusionlist from the words contained in the given file.

Throws:

IOException

tokenStream

public TokenStream tokenStream(String fieldName,
                               Reader reader)

Creates a TokenStream which tokenizes all the text in the provided Reader.

Specified by:

tokenStream in class Analyzer

Returns:

A TokenStream build from a StandardTokenizer filtered with StandardFilter, LowerCaseFilter, StopFilter, GermanStemFilter