Package org.apache.lucene.analysis.core

Class StopFilterFactory

java.lang.Object

org.apache.lucene.analysis.util.AbstractAnalysisFactory

org.apache.lucene.analysis.util.TokenFilterFactory

org.apache.lucene.analysis.core.StopFilterFactory

All Implemented Interfaces:

ResourceLoaderAware

public class StopFilterFactory
extends TokenFilterFactory
implements ResourceLoaderAware

Factory for StopFilter.

 <fieldType name="text_stop" class="solr.TextField" positionIncrementGap="100" autoGeneratePhraseQueries="true">
   <analyzer>
     <tokenizer class="solr.WhitespaceTokenizerFactory"/>
     <filter class="solr.StopFilterFactory" ignoreCase="true"
             words="stopwords.txt" format="wordset" />
   </analyzer>
 </fieldType>

All attributes are optional:

• ignoreCase defaults to false
• words should be the name of a stopwords file to parse, if not specified the factory will use StopAnalyzer.ENGLISH_STOP_WORDS_SET
• format defines how the words file will be parsed, and defaults to wordset. If words is not specified, then format must not be specified.

The valid values for the format option are:

• wordset - This is the default format, which supports one word per line (including any intra-word whitespace) and allows whole line comments begining with the "#" character. Blank lines are ignored. See WordlistLoader.getLines for details.
• snowball - This format allows for multiple words specified on each line, and trailing comments may be specified using the vertical line ("|"). Blank lines are ignored. See WordlistLoader.getSnowballWordSet for details.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	FORMAT_SNOWBALL
static final String	FORMAT_WORDSET

Fields inherited from class org.apache.lucene.analysis.util.AbstractAnalysisFactory

LUCENE_MATCH_VERSION_PARAM

Constructor Summary

Constructors

Constructor	Description
StopFilterFactory(Map<String,String> args)	Creates a new StopFilterFactory

Method Summary

Modifier and Type	Method	Description
TokenStream	create(TokenStream input)	Transform the specified input TokenStream
CharArraySet	getStopWords()
void	inform(ResourceLoader loader)	Initializes this component with the provided ResourceLoader (used for loading classes, files, etc).
boolean	isEnablePositionIncrements()
boolean	isIgnoreCase()

Methods inherited from class org.apache.lucene.analysis.util.TokenFilterFactory

availableTokenFilters, forName, lookupClass, reloadTokenFilters

Methods inherited from class org.apache.lucene.analysis.util.AbstractAnalysisFactory

get, get, get, get, get, getChar, getClassArg, getLuceneMatchVersion, getOriginalArgs, getSet, isExplicitLuceneMatchVersion, require, require, require, requireChar, setExplicitLuceneMatchVersion

Methods inherited from class java.lang.Object

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

Field Details

FORMAT_WORDSET

public static final String FORMAT_WORDSET

See Also:

• Constant Field Values

FORMAT_SNOWBALL

public static final String FORMAT_SNOWBALL

See Also:

• Constant Field Values

Constructor Details

StopFilterFactory

public StopFilterFactory(Map<String,String> args)

Creates a new StopFilterFactory

Method Details

inform

public void inform(ResourceLoader loader)
            throws IOException

Description copied from interface: ResourceLoaderAware

Initializes this component with the provided ResourceLoader (used for loading classes, files, etc).

Specified by:

inform in interface ResourceLoaderAware

Throws:

IOException

isEnablePositionIncrements

public boolean isEnablePositionIncrements()

isIgnoreCase

public boolean isIgnoreCase()

getStopWords

public CharArraySet getStopWords()

create

public TokenStream create(TokenStream input)

Description copied from class: TokenFilterFactory

Transform the specified input TokenStream

Specified by:

create in class TokenFilterFactory