org.apache.lucene.search.highlight
Class WeightedSpanTermExtractor

java.lang.Object
  extended by org.apache.lucene.search.highlight.WeightedSpanTermExtractor

public class WeightedSpanTermExtractor
extends Object

Class used to extract WeightedSpanTerms from a Query based on whether Terms from the Query are contained in a supplied TokenStream.


Constructor Summary
WeightedSpanTermExtractor()
           
WeightedSpanTermExtractor(String defaultField)
           
 
Method Summary
 boolean getExpandMultiTermQuery()
           
 TokenStream getTokenStream()
           
 Map<String,WeightedSpanTerm> getWeightedSpanTerms(Query query, TokenStream tokenStream)
          Creates a Map of WeightedSpanTerms from the given Query and TokenStream.
 Map<String,WeightedSpanTerm> getWeightedSpanTerms(Query query, TokenStream tokenStream, String fieldName)
          Creates a Map of WeightedSpanTerms from the given Query and TokenStream.
 Map<String,WeightedSpanTerm> getWeightedSpanTermsWithScores(Query query, TokenStream tokenStream, String fieldName, IndexReader reader)
          Creates a Map of WeightedSpanTerms from the given Query and TokenStream.
 boolean isCachedTokenStream()
           
 void setExpandMultiTermQuery(boolean expandMultiTermQuery)
           
protected  void setMaxDocCharsToAnalyze(int maxDocCharsToAnalyze)
           
 void setWrapIfNotCachingTokenFilter(boolean wrap)
          By default, TokenStreams that are not of the type CachingTokenFilter are wrapped in a CachingTokenFilter to ensure an efficient reset - if you are already using a different caching TokenStream impl and you don't want it to be wrapped, set this to false.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

WeightedSpanTermExtractor

public WeightedSpanTermExtractor()

WeightedSpanTermExtractor

public WeightedSpanTermExtractor(String defaultField)
Method Detail

getWeightedSpanTerms

public Map<String,WeightedSpanTerm> getWeightedSpanTerms(Query query,
                                                         TokenStream tokenStream)
                                                  throws IOException
Creates a Map of WeightedSpanTerms from the given Query and TokenStream.

Parameters:
query - that caused hit
tokenStream - of text to be highlighted
Returns:
Map containing WeightedSpanTerms
Throws:
IOException

getWeightedSpanTerms

public Map<String,WeightedSpanTerm> getWeightedSpanTerms(Query query,
                                                         TokenStream tokenStream,
                                                         String fieldName)
                                                  throws IOException
Creates a Map of WeightedSpanTerms from the given Query and TokenStream.

Parameters:
query - that caused hit
tokenStream - of text to be highlighted
fieldName - restricts Term's used based on field name
Returns:
Map containing WeightedSpanTerms
Throws:
IOException

getWeightedSpanTermsWithScores

public Map<String,WeightedSpanTerm> getWeightedSpanTermsWithScores(Query query,
                                                                   TokenStream tokenStream,
                                                                   String fieldName,
                                                                   IndexReader reader)
                                                            throws IOException
Creates a Map of WeightedSpanTerms from the given Query and TokenStream. Uses a supplied IndexReader to properly weight terms (for gradient highlighting).

Parameters:
query - that caused hit
tokenStream - of text to be highlighted
fieldName - restricts Term's used based on field name
reader - to use for scoring
Returns:
Map of WeightedSpanTerms with quasi tf/idf scores
Throws:
IOException

getExpandMultiTermQuery

public boolean getExpandMultiTermQuery()

setExpandMultiTermQuery

public void setExpandMultiTermQuery(boolean expandMultiTermQuery)

isCachedTokenStream

public boolean isCachedTokenStream()

getTokenStream

public TokenStream getTokenStream()

setWrapIfNotCachingTokenFilter

public void setWrapIfNotCachingTokenFilter(boolean wrap)
By default, TokenStreams that are not of the type CachingTokenFilter are wrapped in a CachingTokenFilter to ensure an efficient reset - if you are already using a different caching TokenStream impl and you don't want it to be wrapped, set this to false.

Parameters:
wrap -

setMaxDocCharsToAnalyze

protected final void setMaxDocCharsToAnalyze(int maxDocCharsToAnalyze)


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