org.apache.lucene.search.suggest.analyzing

## Class SuggestStopFilterFactory

- java.lang.Object
- - org.apache.lucene.analysis.util.AbstractAnalysisFactory
  - - org.apache.lucene.analysis.util.TokenFilterFactory
    - - org.apache.lucene.search.suggest.analyzing.SuggestStopFilterFactory

- All Implemented Interfaces:
    ResourceLoaderAware

      public class SuggestStopFilterFactory
      extends TokenFilterFactory
      implements ResourceLoaderAware

  Factory for `SuggestStopFilter`.

       <fieldType name="autosuggest" class="solr.TextField"
                  positionIncrementGap="100" autoGeneratePhraseQueries="true">
         <analyzer>
           <tokenizer class="solr.WhitespaceTokenizerFactory"/>
           <filter class="solr.LowerCaseFilterFactory"/>
           <filter class="solr.SuggestStopFilterFactory" 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 `EnglishAnalyzer.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 beginning 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.
  Since:
    5.0.0
  SPI Name (Note: This is case-insensitive. e.g., if the name is 'htmlStrip', 'htmlstrip' can be used when looking up the service):
    "suggestStop"

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `FORMAT_SNOWBALL` multiple words may be specified on each line, trailing comments start with "|"
    `static String` | `FORMAT_WORDSET` the default format, one word per line, whole line comments start with "#"
    `static String` | `NAME` SPI name

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

      `LUCENE_MATCH_VERSION_PARAM, luceneMatchVersion`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `SuggestStopFilterFactory(Map<String,String> args)` Creates a new StopFilterFactory

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `TokenStream` | `create(TokenStream input)`
    `CharArraySet` | `getStopWords()` Returns the configured stopword set
    `void` | `inform(ResourceLoader loader)`
    `boolean` | `isIgnoreCase()` Whether or not to ignore case

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

      `availableTokenFilters, findSPIName, forName, lookupClass, normalize, reloadTokenFilters`

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

      `get, get, get, get, get, getBoolean, getChar, getClassArg, getFloat, getInt, getLines, getLuceneMatchVersion, getOriginalArgs, getPattern, getSet, getSnowballWordSet, getWordSet, isExplicitLuceneMatchVersion, require, require, require, requireBoolean, requireChar, requireFloat, requireInt, setExplicitLuceneMatchVersion, splitAt, splitFileNames`

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### NAME

          public static final String NAME

      SPI name
      See Also:
        Constant Field Values

    - #### FORMAT_WORDSET

          public static final String FORMAT_WORDSET

      the default format, one word per line, whole line comments start with "#"
      See Also:
        Constant Field Values

    - #### FORMAT_SNOWBALL

          public static final String FORMAT_SNOWBALL

      multiple words may be specified on each line, trailing comments start with "|"
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### SuggestStopFilterFactory

          public SuggestStopFilterFactory(Map<String,String> args)

      Creates a new StopFilterFactory

  - ### Method Detail

    - #### inform

          public void inform(ResourceLoader loader)
                      throws IOException

      Specified by:
        `inform` in interface `ResourceLoaderAware`
      Throws:
        `IOException`

    - #### isIgnoreCase

          public boolean isIgnoreCase()

      Whether or not to ignore case

    - #### getStopWords

          public CharArraySet getStopWords()

      Returns the configured stopword set

    - #### create

          public TokenStream create(TokenStream input)

      Specified by:
        `create` in class `TokenFilterFactory`

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