org.apache.lucene.analysis
Class StopAnalyzer

java.lang.Object
  org.apache.lucene.analysis.Analyzer
      org.apache.lucene.analysis.ReusableAnalyzerBase
          org.apache.lucene.analysis.StopwordAnalyzerBase
              org.apache.lucene.analysis.StopAnalyzer

All Implemented Interfaces:

Closeable

public final class StopAnalyzer
extends StopwordAnalyzerBase

Filters LetterTokenizer with LowerCaseFilter and StopFilter.

You must specify the required Version compatibility when creating StopAnalyzer:

• As of 3.1, StopFilter correctly handles Unicode 4.0 supplementary characters in stopwords
• As of 2.9, position increments are preserved

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.analysis.ReusableAnalyzerBase

ReusableAnalyzerBase.TokenStreamComponents

Field Summary

static Set<?>

ENGLISH_STOP_WORDS_SET An unmodifiable set containing some common English words that are not usually useful for searching.

Fields inherited from class org.apache.lucene.analysis.StopwordAnalyzerBase

matchVersion, stopwords

Constructor Summary

StopAnalyzer(Version matchVersion)
Builds an analyzer which removes words in ENGLISH_STOP_WORDS_SET.

StopAnalyzer(Version matchVersion, File stopwordsFile)
Builds an analyzer with the stop words from the given file.

StopAnalyzer(Version matchVersion, Reader stopwords)
Builds an analyzer with the stop words from the given reader.

StopAnalyzer(Version matchVersion, Set<?> stopWords)
Builds an analyzer with the stop words from the given set.

Method Summary

protected ReusableAnalyzerBase.TokenStreamComponents

createComponents(String fieldName, Reader reader) Creates ReusableAnalyzerBase.TokenStreamComponents used to tokenize all the text in the provided Reader.

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

getStopwordSet, loadStopwordSet

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

initReader, reusableTokenStream, tokenStream

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

close, getOffsetGap, getPositionIncrementGap, getPreviousTokenStream, setPreviousTokenStream

Methods inherited from class java.lang.Object

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

Field Detail

ENGLISH_STOP_WORDS_SET

public static final Set<?> ENGLISH_STOP_WORDS_SET

An unmodifiable set containing some common English words that are not usually useful for searching.

Constructor Detail

StopAnalyzer

public StopAnalyzer(Version matchVersion)

Builds an analyzer which removes words in ENGLISH_STOP_WORDS_SET.

Parameters:

matchVersion - See above

StopAnalyzer

public StopAnalyzer(Version matchVersion,
                    Set<?> stopWords)

Builds an analyzer with the stop words from the given set.

Parameters:

matchVersion - See above

stopWords - Set of stop words

StopAnalyzer

public StopAnalyzer(Version matchVersion,
                    File stopwordsFile)
             throws IOException

Builds an analyzer with the stop words from the given file.

Parameters:

matchVersion - See above

stopwordsFile - File to load stop words from

Throws:

IOException

See Also:

WordlistLoader.getWordSet(File)

StopAnalyzer

public StopAnalyzer(Version matchVersion,
                    Reader stopwords)
             throws IOException

Builds an analyzer with the stop words from the given reader.

Parameters:

matchVersion - See above

stopwords - Reader to load stop words from

Throws:

IOException

See Also:

WordlistLoader.getWordSet(Reader)

Method Detail

createComponents

protected ReusableAnalyzerBase.TokenStreamComponents createComponents(String fieldName,
                                                                      Reader reader)

Creates ReusableAnalyzerBase.TokenStreamComponents used to tokenize all the text in the provided Reader.

Specified by:

createComponents in class ReusableAnalyzerBase

Parameters:

fieldName - the name of the fields content passed to the ReusableAnalyzerBase.TokenStreamComponents sink as a reader

reader - the reader passed to the Tokenizer constructor

Returns:

ReusableAnalyzerBase.TokenStreamComponents built from a LowerCaseTokenizer filtered with StopFilter