org.apache.lucene.search.vectorhighlight
Class FastVectorHighlighter

java.lang.Object
  extended by org.apache.lucene.search.vectorhighlight.FastVectorHighlighter

public class FastVectorHighlighter
extends Object

Another highlighter implementation.


Field Summary
static boolean DEFAULT_FIELD_MATCH
           
static boolean DEFAULT_PHRASE_HIGHLIGHT
           
 
Constructor Summary
FastVectorHighlighter()
          the default constructor.
FastVectorHighlighter(boolean phraseHighlight, boolean fieldMatch)
          a constructor.
FastVectorHighlighter(boolean phraseHighlight, boolean fieldMatch, FragListBuilder fragListBuilder, FragmentsBuilder fragmentsBuilder)
          a constructor.
 
Method Summary
 String getBestFragment(FieldQuery fieldQuery, IndexReader reader, int docId, String fieldName, int fragCharSize)
          return the best fragment.
 String getBestFragment(FieldQuery fieldQuery, IndexReader reader, int docId, String fieldName, int fragCharSize, FragListBuilder fragListBuilder, FragmentsBuilder fragmentsBuilder, String[] preTags, String[] postTags, Encoder encoder)
          return the best fragment.
 String[] getBestFragments(FieldQuery fieldQuery, IndexReader reader, int docId, String fieldName, int fragCharSize, int maxNumFragments)
          return the best fragments.
 String[] getBestFragments(FieldQuery fieldQuery, IndexReader reader, int docId, String fieldName, int fragCharSize, int maxNumFragments, FragListBuilder fragListBuilder, FragmentsBuilder fragmentsBuilder, String[] preTags, String[] postTags, Encoder encoder)
          return the best fragments.
 FieldQuery getFieldQuery(Query query)
          create a FieldQuery object.
 int getPhraseLimit()
           
 boolean isFieldMatch()
          return whether fieldMatch or not.
 boolean isPhraseHighlight()
          return whether phraseHighlight or not.
 void setPhraseLimit(int phraseLimit)
          set the maximum number of phrases to analyze when searching for the highest-scoring phrase.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

DEFAULT_PHRASE_HIGHLIGHT

public static final boolean DEFAULT_PHRASE_HIGHLIGHT
See Also:
Constant Field Values

DEFAULT_FIELD_MATCH

public static final boolean DEFAULT_FIELD_MATCH
See Also:
Constant Field Values
Constructor Detail

FastVectorHighlighter

public FastVectorHighlighter()
the default constructor.


FastVectorHighlighter

public FastVectorHighlighter(boolean phraseHighlight,
                             boolean fieldMatch)
a constructor. Using SimpleFragListBuilder and ScoreOrderFragmentsBuilder.

Parameters:
phraseHighlight - true or false for phrase highlighting
fieldMatch - true of false for field matching

FastVectorHighlighter

public FastVectorHighlighter(boolean phraseHighlight,
                             boolean fieldMatch,
                             FragListBuilder fragListBuilder,
                             FragmentsBuilder fragmentsBuilder)
a constructor. A FragListBuilder and a FragmentsBuilder can be specified (plugins).

Parameters:
phraseHighlight - true of false for phrase highlighting
fieldMatch - true of false for field matching
fragListBuilder - an instance of FragListBuilder
fragmentsBuilder - an instance of FragmentsBuilder
Method Detail

getFieldQuery

public FieldQuery getFieldQuery(Query query)
create a FieldQuery object.

Parameters:
query - a query
Returns:
the created FieldQuery object

getBestFragment

public final String getBestFragment(FieldQuery fieldQuery,
                                    IndexReader reader,
                                    int docId,
                                    String fieldName,
                                    int fragCharSize)
                             throws IOException
return the best fragment.

Parameters:
fieldQuery - FieldQuery object
reader - IndexReader of the index
docId - document id to be highlighted
fieldName - field of the document to be highlighted
fragCharSize - the length (number of chars) of a fragment
Returns:
the best fragment (snippet) string
Throws:
IOException

getBestFragments

public final String[] getBestFragments(FieldQuery fieldQuery,
                                       IndexReader reader,
                                       int docId,
                                       String fieldName,
                                       int fragCharSize,
                                       int maxNumFragments)
                                throws IOException
return the best fragments.

Parameters:
fieldQuery - FieldQuery object
reader - IndexReader of the index
docId - document id to be highlighted
fieldName - field of the document to be highlighted
fragCharSize - the length (number of chars) of a fragment
maxNumFragments - maximum number of fragments
Returns:
created fragments or null when no fragments created. size of the array can be less than maxNumFragments
Throws:
IOException

getBestFragment

public final String getBestFragment(FieldQuery fieldQuery,
                                    IndexReader reader,
                                    int docId,
                                    String fieldName,
                                    int fragCharSize,
                                    FragListBuilder fragListBuilder,
                                    FragmentsBuilder fragmentsBuilder,
                                    String[] preTags,
                                    String[] postTags,
                                    Encoder encoder)
                             throws IOException
return the best fragment.

Parameters:
fieldQuery - FieldQuery object
reader - IndexReader of the index
docId - document id to be highlighted
fieldName - field of the document to be highlighted
fragCharSize - the length (number of chars) of a fragment
fragListBuilder - FragListBuilder object
fragmentsBuilder - FragmentsBuilder object
preTags - pre-tags to be used to highlight terms
postTags - post-tags to be used to highlight terms
encoder - an encoder that generates encoded text
Returns:
the best fragment (snippet) string
Throws:
IOException

getBestFragments

public final String[] getBestFragments(FieldQuery fieldQuery,
                                       IndexReader reader,
                                       int docId,
                                       String fieldName,
                                       int fragCharSize,
                                       int maxNumFragments,
                                       FragListBuilder fragListBuilder,
                                       FragmentsBuilder fragmentsBuilder,
                                       String[] preTags,
                                       String[] postTags,
                                       Encoder encoder)
                                throws IOException
return the best fragments.

Parameters:
fieldQuery - FieldQuery object
reader - IndexReader of the index
docId - document id to be highlighted
fieldName - field of the document to be highlighted
fragCharSize - the length (number of chars) of a fragment
maxNumFragments - maximum number of fragments
fragListBuilder - FragListBuilder object
fragmentsBuilder - FragmentsBuilder object
preTags - pre-tags to be used to highlight terms
postTags - post-tags to be used to highlight terms
encoder - an encoder that generates encoded text
Returns:
created fragments or null when no fragments created. size of the array can be less than maxNumFragments
Throws:
IOException

isPhraseHighlight

public boolean isPhraseHighlight()
return whether phraseHighlight or not.

Returns:
whether phraseHighlight or not

isFieldMatch

public boolean isFieldMatch()
return whether fieldMatch or not.

Returns:
whether fieldMatch or not

getPhraseLimit

public int getPhraseLimit()
Returns:
the maximum number of phrases to analyze when searching for the highest-scoring phrase.

setPhraseLimit

public void setPhraseLimit(int phraseLimit)
set the maximum number of phrases to analyze when searching for the highest-scoring phrase. The default is unlimited (Integer.MAX_VALUE).



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