org.apache.lucene.analysis
Class KeywordMarkerFilter

java.lang.Object
  org.apache.lucene.util.AttributeSource
      org.apache.lucene.analysis.TokenStream
          org.apache.lucene.analysis.TokenFilter
              org.apache.lucene.analysis.KeywordMarkerFilter

All Implemented Interfaces:

Closeable

public final class KeywordMarkerFilter
extends TokenFilter

Marks terms as keywords via the KeywordAttribute. Each token contained in the provided is marked as a keyword by setting KeywordAttribute.setKeyword(boolean) to true.

See Also:

KeywordAttribute

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

KeywordMarkerFilter(TokenStream in, CharArraySet keywordSet)
Create a new KeywordMarkerFilter, that marks the current token as a keyword if the tokens term buffer is contained in the given set via the KeywordAttribute.

KeywordMarkerFilter(TokenStream in, Set<?> keywordSet)
Create a new KeywordMarkerFilter, that marks the current token as a keyword if the tokens term buffer is contained in the given set via the KeywordAttribute.

Method Summary

boolean

incrementToken() Consumers (i.e., IndexWriter) use this method to advance the stream to the next token.

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

close, end, reset

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

KeywordMarkerFilter

public KeywordMarkerFilter(TokenStream in,
                           CharArraySet keywordSet)

Create a new KeywordMarkerFilter, that marks the current token as a keyword if the tokens term buffer is contained in the given set via the KeywordAttribute.

Parameters:

in - TokenStream to filter

keywordSet - the keywords set to lookup the current termbuffer

KeywordMarkerFilter

public KeywordMarkerFilter(TokenStream in,
                           Set<?> keywordSet)

Create a new KeywordMarkerFilter, that marks the current token as a keyword if the tokens term buffer is contained in the given set via the KeywordAttribute.

Parameters:

in - TokenStream to filter

keywordSet - the keywords set to lookup the current termbuffer

Method Detail

incrementToken

public final boolean incrementToken()
                             throws IOException

Description copied from class: TokenStream

Consumers (i.e., IndexWriter) use this method to advance the stream to the next token. Implementing classes must implement this method and update the appropriate AttributeImpls with the attributes of the next token.

The producer must make no assumptions about the attributes after the method has been returned: the caller may arbitrarily change it. If the producer needs to preserve the state for subsequent calls, it can use AttributeSource.captureState() to create a copy of the current attribute state.

This method is called for every token of a document, so an efficient implementation is crucial for good performance. To avoid calls to AttributeSource.addAttribute(Class) and AttributeSource.getAttribute(Class), references to all AttributeImpls that this stream uses should be retrieved during instantiation.

To ensure that filters and consumers know which attributes are available, the attributes must be added during instantiation. Filters and consumers are not required to check for availability of attributes in TokenStream.incrementToken().

Specified by:

incrementToken in class TokenStream

Returns:

false for end of stream; true otherwise

Throws:

IOException