KeepWordFilter (Solr 3.6.2 API)
Keywords: org.apache.solr.analysis.KeepWordFilter class

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## org.apache.solr.analysis
Class KeepWordFilter

    java.lang.Object
      org.apache.lucene.util.AttributeSource
          org.apache.lucene.analysis.TokenStream
              org.apache.lucene.analysis.TokenFilter
                  org.apache.lucene.analysis.FilteringTokenFilter
                      org.apache.solr.analysis.KeepWordFilter

All Implemented Interfaces:
  Closeable

    public final class KeepWordFilter

extends FilteringTokenFilter

A TokenFilter that only keeps tokens with text contained in the required words. This filter behaves like the inverse of StopFilter.

Since:
  solr 1.3
Version:
  $Id: KeepWordFilter.java 1065324 2011-01-30 17:20:39Z uschindler $

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource
`AttributeSource.AttributeFactory, AttributeSource.State`

Field Summary

Fields inherited from class org.apache.lucene.analysis.TokenFilter
`input`

Constructor Summary
`KeepWordFilter(boolean enablePositionIncrements, TokenStream in, CharArraySet words)` The words set passed to this constructor will be directly used by this filter and should not be modified,
`KeepWordFilter(TokenStream in, Set<String> words, boolean ignoreCase)` Deprecated. Use `KeepWordFilter(boolean, TokenStream, CharArraySet)` instead

Method Summary
`boolean` | `accept()`

Methods inherited from class org.apache.lucene.analysis.FilteringTokenFilter
`getEnablePositionIncrements, incrementToken, reset, setEnablePositionIncrements`

Methods inherited from class org.apache.lucene.analysis.TokenFilter
`close, end`

Methods inherited from class org.apache.lucene.util.AttributeSource
`addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, restoreState, toString`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail

### KeepWordFilter

    @Deprecated
    public KeepWordFilter(TokenStream in,
                                     Set<String> words,
                                     boolean ignoreCase)

  Deprecated. Use `KeepWordFilter(boolean, TokenStream, CharArraySet)` instead

### KeepWordFilter

    public KeepWordFilter(boolean enablePositionIncrements,
                          TokenStream in,
                          CharArraySet words)

  The words set passed to this constructor will be directly used by this filter and should not be modified,

Method Detail

### accept

    public boolean accept()
                   throws IOException

  Specified by:
    `accept` in class `FilteringTokenFilter`
  Throws:
    `IOException`

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