Package org.apache.lucene.analysis

Class StopwordAnalyzerBase

java.lang.Object

org.apache.lucene.analysis.Analyzer

org.apache.lucene.analysis.StopwordAnalyzerBase

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

StandardAnalyzer

public abstract class StopwordAnalyzerBase
extends Analyzer

Base class for Analyzers that need to make use of stopword sets.

Since:

3.1

Nested Class Summary

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

Analyzer.ReuseStrategy, Analyzer.TokenStreamComponents

Field Summary

Fields

Modifier and Type	Field	Description
protected CharArraySet	stopwords	An immutable stopword set

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

GLOBAL_REUSE_STRATEGY, PER_FIELD_REUSE_STRATEGY

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	StopwordAnalyzerBase()	Creates a new Analyzer with an empty stopword set
protected	StopwordAnalyzerBase(CharArraySet stopwords)	Creates a new instance initialized with the given stopword set

Method Summary

Modifier and Type	Method	Description
CharArraySet	getStopwordSet()	Returns the analyzer's stopword set or an empty set if the analyzer has no stopwords
protected static CharArraySet	loadStopwordSet(boolean ignoreCase, Class<? extends Analyzer> aClass, String resource, String comment)	Creates a CharArraySet from a file resource associated with a class.
protected static CharArraySet	loadStopwordSet(Reader stopwords)	Creates a CharArraySet from a file.
protected static CharArraySet	loadStopwordSet(Path stopwords)	Creates a CharArraySet from a path.

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

attributeFactory, close, createComponents, getOffsetGap, getPositionIncrementGap, getReuseStrategy, initReader, initReaderForNormalization, normalize, normalize, tokenStream, tokenStream

Methods inherited from class java.lang.Object

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

Field Detail

stopwords

protected final CharArraySet stopwords

An immutable stopword set

Constructor Detail

StopwordAnalyzerBase

protected StopwordAnalyzerBase(CharArraySet stopwords)

Creates a new instance initialized with the given stopword set

Parameters:

stopwords - the analyzer's stopword set

StopwordAnalyzerBase

protected StopwordAnalyzerBase()

Creates a new Analyzer with an empty stopword set

Method Detail

getStopwordSet

public CharArraySet getStopwordSet()

Returns the analyzer's stopword set or an empty set if the analyzer has no stopwords

Returns:

the analyzer's stopword set or an empty set if the analyzer has no stopwords

loadStopwordSet

protected static CharArraySet loadStopwordSet(boolean ignoreCase,
                                              Class<? extends Analyzer> aClass,
                                              String resource,
                                              String comment)
                                       throws IOException

Creates a CharArraySet from a file resource associated with a class. (See Class.getResourceAsStream(String)).

Parameters:

ignoreCase - true if the set should ignore the case of the stopwords, otherwise false

aClass - a class that is associated with the given stopwordResource

resource - name of the resource file associated with the given class

comment - comment string to ignore in the stopword file

Returns:

a CharArraySet containing the distinct stopwords from the given file

Throws:

IOException - if loading the stopwords throws an IOException

loadStopwordSet

protected static CharArraySet loadStopwordSet(Path stopwords)
                                       throws IOException

Creates a CharArraySet from a path.

Parameters:

stopwords - the stopwords file to load

Returns:

a CharArraySet containing the distinct stopwords from the given file

Throws:

IOException - if loading the stopwords throws an IOException

loadStopwordSet

protected static CharArraySet loadStopwordSet(Reader stopwords)
                                       throws IOException

Creates a CharArraySet from a file.

Parameters:

stopwords - the stopwords reader to load

Returns:

a CharArraySet containing the distinct stopwords from the given reader

Throws:

IOException - if loading the stopwords throws an IOException