org.apache.lucene.search.vectorhighlight
Class BaseFragmentsBuilder

java.lang.Object
  org.apache.lucene.search.vectorhighlight.BaseFragmentsBuilder

All Implemented Interfaces:

FragmentsBuilder

Direct Known Subclasses:

ScoreOrderFragmentsBuilder, SimpleFragmentsBuilder

public abstract class BaseFragmentsBuilder
extends Object
implements FragmentsBuilder

Base FragmentsBuilder implementation that supports colored pre/post tags and multivalued fields.

Uses BoundaryScanner to determine fragments.

Field Summary

static String[]	COLORED_POST_TAGS
static String[]	COLORED_PRE_TAGS
protected String[]	postTags
protected String[]	preTags

Constructor Summary

protected	BaseFragmentsBuilder()
protected	BaseFragmentsBuilder(BoundaryScanner boundaryScanner)
protected	BaseFragmentsBuilder(String[] preTags, String[] postTags)
protected	BaseFragmentsBuilder(String[] preTags, String[] postTags, BoundaryScanner boundaryScanner)

Method Summary

String	createFragment(IndexReader reader, int docId, String fieldName, FieldFragList fieldFragList) create a fragment.
String	createFragment(IndexReader reader, int docId, String fieldName, FieldFragList fieldFragList, String[] preTags, String[] postTags, Encoder encoder) create a fragment.
String[]	createFragments(IndexReader reader, int docId, String fieldName, FieldFragList fieldFragList, int maxNumFragments) create multiple fragments.
String[]	createFragments(IndexReader reader, int docId, String fieldName, FieldFragList fieldFragList, int maxNumFragments, String[] preTags, String[] postTags, Encoder encoder) create multiple fragments.
protected List<FieldFragList.WeightedFragInfo>	discreteMultiValueHighlighting(List<FieldFragList.WeightedFragInfo> fragInfos, Field[] fields)
protected Field[]	getFields(IndexReader reader, int docId, String fieldName)
protected String	getFragmentSource(StringBuilder buffer, int[] index, Field[] values, int startOffset, int endOffset)
protected String	getFragmentSourceMSO(StringBuilder buffer, int[] index, Field[] values, int startOffset, int endOffset, int[] modifiedStartOffset)
char	getMultiValuedSeparator()
protected String	getPostTag(int num)
protected String	getPostTag(String[] postTags, int num)
protected String	getPreTag(int num)
protected String	getPreTag(String[] preTags, int num)
abstract List<FieldFragList.WeightedFragInfo>	getWeightedFragInfoList(List<FieldFragList.WeightedFragInfo> src)
boolean	isDiscreteMultiValueHighlighting()
protected String	makeFragment(StringBuilder buffer, int[] index, Field[] values, FieldFragList.WeightedFragInfo fragInfo, String[] preTags, String[] postTags, Encoder encoder)
void	setDiscreteMultiValueHighlighting(boolean discreteMultiValueHighlighting)
void	setMultiValuedSeparator(char separator)

Methods inherited from class java.lang.Object

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

Field Detail

preTags

protected String[] preTags

postTags

protected String[] postTags

COLORED_PRE_TAGS

public static final String[] COLORED_PRE_TAGS

COLORED_POST_TAGS

public static final String[] COLORED_POST_TAGS

Constructor Detail

BaseFragmentsBuilder

protected BaseFragmentsBuilder()

BaseFragmentsBuilder

protected BaseFragmentsBuilder(String[] preTags,
                               String[] postTags)

BaseFragmentsBuilder

protected BaseFragmentsBuilder(BoundaryScanner boundaryScanner)

BaseFragmentsBuilder

protected BaseFragmentsBuilder(String[] preTags,
                               String[] postTags,
                               BoundaryScanner boundaryScanner)

Method Detail

getWeightedFragInfoList

public abstract List<FieldFragList.WeightedFragInfo> getWeightedFragInfoList(List<FieldFragList.WeightedFragInfo> src)

createFragment

public String createFragment(IndexReader reader,
                             int docId,
                             String fieldName,
                             FieldFragList fieldFragList)
                      throws IOException

Description copied from interface: FragmentsBuilder

create a fragment.

Specified by:

createFragment in interface FragmentsBuilder

Parameters:

reader - IndexReader of the index

docId - document id to be highlighted

fieldName - field of the document to be highlighted

fieldFragList - FieldFragList object

Returns:

a created fragment or null when no fragment created

Throws:

IOException - If there is a low-level I/O error

createFragments

public String[] createFragments(IndexReader reader,
                                int docId,
                                String fieldName,
                                FieldFragList fieldFragList,
                                int maxNumFragments)
                         throws IOException

Description copied from interface: FragmentsBuilder

create multiple fragments.

Specified by:

createFragments in interface FragmentsBuilder

Parameters:

reader - IndexReader of the index

docId - document id to be highlighter

fieldName - field of the document to be highlighted

fieldFragList - FieldFragList object

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 - If there is a low-level I/O error

createFragment

public String createFragment(IndexReader reader,
                             int docId,
                             String fieldName,
                             FieldFragList fieldFragList,
                             String[] preTags,
                             String[] postTags,
                             Encoder encoder)
                      throws IOException

Description copied from interface: FragmentsBuilder

create a fragment.

Specified by:

createFragment in interface FragmentsBuilder

Parameters:

reader - IndexReader of the index

docId - document id to be highlighted

fieldName - field of the document to be highlighted

fieldFragList - FieldFragList 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:

a created fragment or null when no fragment created

Throws:

IOException - If there is a low-level I/O error

createFragments

public String[] createFragments(IndexReader reader,
                                int docId,
                                String fieldName,
                                FieldFragList fieldFragList,
                                int maxNumFragments,
                                String[] preTags,
                                String[] postTags,
                                Encoder encoder)
                         throws IOException

Description copied from interface: FragmentsBuilder

create multiple fragments.

Specified by:

createFragments in interface FragmentsBuilder

Parameters:

reader - IndexReader of the index

docId - document id to be highlighter

fieldName - field of the document to be highlighted

fieldFragList - FieldFragList object

maxNumFragments - maximum number of fragments

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 - If there is a low-level I/O error

getFields

protected Field[] getFields(IndexReader reader,
                            int docId,
                            String fieldName)
                     throws IOException

Throws:

IOException

makeFragment

protected String makeFragment(StringBuilder buffer,
                              int[] index,
                              Field[] values,
                              FieldFragList.WeightedFragInfo fragInfo,
                              String[] preTags,
                              String[] postTags,
                              Encoder encoder)

getFragmentSourceMSO

protected String getFragmentSourceMSO(StringBuilder buffer,
                                      int[] index,
                                      Field[] values,
                                      int startOffset,
                                      int endOffset,
                                      int[] modifiedStartOffset)

getFragmentSource

protected String getFragmentSource(StringBuilder buffer,
                                   int[] index,
                                   Field[] values,
                                   int startOffset,
                                   int endOffset)

discreteMultiValueHighlighting

protected List<FieldFragList.WeightedFragInfo> discreteMultiValueHighlighting(List<FieldFragList.WeightedFragInfo> fragInfos,
                                                                              Field[] fields)

setMultiValuedSeparator

public void setMultiValuedSeparator(char separator)

getMultiValuedSeparator

public char getMultiValuedSeparator()

isDiscreteMultiValueHighlighting

public boolean isDiscreteMultiValueHighlighting()

setDiscreteMultiValueHighlighting

public void setDiscreteMultiValueHighlighting(boolean discreteMultiValueHighlighting)

getPreTag

protected String getPreTag(int num)

getPostTag

protected String getPostTag(int num)

getPreTag

protected String getPreTag(String[] preTags,
                           int num)

getPostTag

protected String getPostTag(String[] postTags,
                            int num)