org.apache.lucene.analysis
Class StopAnalyzer

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

All Implemented Interfaces:

Closeable

public final class StopAnalyzer
extends Analyzer

Filters LetterTokenizer with LowerCaseFilter and StopFilter.

You must specify the required Version compatibility when creating StopAnalyzer:

• As of 2.9, position increments are preserved

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.Analyzer

overridesTokenStreamMethod

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

TokenStream	reusableTokenStream(String fieldName, Reader reader) Creates a TokenStream that is allowed to be re-used from the previous time that the same thread called this method.
TokenStream	tokenStream(String fieldName, Reader reader) Filters LowerCaseTokenizer with StopFilter.

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

close, getOffsetGap, getPositionIncrementGap, getPreviousTokenStream, setOverridesTokenStreamMethod, 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

tokenStream

public TokenStream tokenStream(String fieldName,
                               Reader reader)

Filters LowerCaseTokenizer with StopFilter.

Specified by:

tokenStream in class Analyzer

reusableTokenStream

public TokenStream reusableTokenStream(String fieldName,
                                       Reader reader)
                                throws IOException

Description copied from class: Analyzer

Creates a TokenStream that is allowed to be re-used from the previous time that the same thread called this method. Callers that do not need to use more than one TokenStream at the same time from this analyzer should use this method for better performance.

Overrides:

reusableTokenStream in class Analyzer

Throws:

IOException