org.apache.lucene.analysis.de
Class GermanAnalyzer

java.lang.Object
  |
  +--org.apache.lucene.analysis.Analyzer
        |
        +--org.apache.lucene.analysis.de.GermanAnalyzer

public final 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,v 1.3 2002/04/19 19:09:36 otis Exp $

Author:

Gerhard Schwarz

Constructor Summary

GermanAnalyzer()
Builds an analyzer.

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

GermanAnalyzer(Hashtable 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(Hashtable 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

tokenStream

Methods inherited from class java.lang.Object

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

Constructor Detail

GermanAnalyzer

public GermanAnalyzer()

Builds an analyzer.

GermanAnalyzer

public GermanAnalyzer(String[] stopwords)

Builds an analyzer with the given stop words.

GermanAnalyzer

public GermanAnalyzer(Hashtable stopwords)

Builds an analyzer with the given stop words.

GermanAnalyzer

public GermanAnalyzer(File stopwords)

Builds an analyzer with the given stop words.

Method Detail

setStemExclusionTable

public void setStemExclusionTable(String[] exclusionlist)

Builds an exclusionlist from an array of Strings.

setStemExclusionTable

public void setStemExclusionTable(Hashtable exclusionlist)

Builds an exclusionlist from a Hashtable.

setStemExclusionTable

public void setStemExclusionTable(File exclusionlist)

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

tokenStream

public final TokenStream tokenStream(String fieldName,
                                     Reader reader)

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

Overrides:

tokenStream in class Analyzer

Returns:

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