org.apache.nutch.scoring.link
Class LinkAnalysisScoringFilter

java.lang.Object
  org.apache.nutch.scoring.link.LinkAnalysisScoringFilter

All Implemented Interfaces:

Configurable, FieldPluggable, Pluggable, ScoringFilter

public class LinkAnalysisScoringFilter
extends Object
implements ScoringFilter

Field Summary

Fields inherited from interface org.apache.nutch.scoring.ScoringFilter

X_POINT_ID

Constructor Summary

LinkAnalysisScoringFilter()

Method Summary

void	distributeScoreToOutlinks(String fromUrl, WebPage page, Collection<ScoreDatum> scoreData, int allCount) Distribute score value from the current page to all its outlinked pages.
float	generatorSortValue(String url, WebPage page, float initSort) This method prepares a sort value for the purpose of sorting and selecting top N scoring pages during fetchlist generation.
Configuration	getConf()
Collection<WebPage.Field>	getFields()
float	indexerScore(String url, NutchDocument doc, WebPage page, float initScore) This method calculates a Lucene document boost.
void	initialScore(String url, WebPage page) Set an initial score for newly discovered pages.
void	injectedScore(String url, WebPage page) Set an initial score for newly injected pages.
void	setConf(Configuration conf)
void	updateScore(String url, WebPage page, List<ScoreDatum> inlinkedScoreData) This method calculates a new score during table update, based on the values contributed by inlinked pages.

Methods inherited from class java.lang.Object

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

Constructor Detail

LinkAnalysisScoringFilter

public LinkAnalysisScoringFilter()

Method Detail

getConf

public Configuration getConf()

Specified by:

getConf in interface Configurable

setConf

public void setConf(Configuration conf)

Specified by:

setConf in interface Configurable

getFields

public Collection<WebPage.Field> getFields()

Specified by:

getFields in interface FieldPluggable

injectedScore

public void injectedScore(String url,
                          WebPage page)
                   throws ScoringFilterException

Description copied from interface: ScoringFilter

Set an initial score for newly injected pages. Note: newly injected pages may have no inlinks, so filter implementations may wish to set this score to a non-zero value, to give newly injected pages some initial credit.

Specified by:

injectedScore in interface ScoringFilter

Parameters:

url - url of the page

page - new page. Filters will modify it in-place.

Throws:

ScoringFilterException

initialScore

public void initialScore(String url,
                         WebPage page)
                  throws ScoringFilterException

Description copied from interface: ScoringFilter

Set an initial score for newly discovered pages. Note: newly discovered pages have at least one inlink with its score contribution, so filter implementations may choose to set initial score to zero (unknown value), and then the inlink score contribution will set the "real" value of the new page.

Specified by:

initialScore in interface ScoringFilter

Parameters:

url - url of the page

Throws:

ScoringFilterException

generatorSortValue

public float generatorSortValue(String url,
                                WebPage page,
                                float initSort)
                         throws ScoringFilterException

Description copied from interface: ScoringFilter

This method prepares a sort value for the purpose of sorting and selecting top N scoring pages during fetchlist generation.

Specified by:

generatorSortValue in interface ScoringFilter

Parameters:

url - url of the page

initSort - initial sort value, or a value from previous filters in chain

Throws:

ScoringFilterException

distributeScoreToOutlinks

public void distributeScoreToOutlinks(String fromUrl,
                                      WebPage page,
                                      Collection<ScoreDatum> scoreData,
                                      int allCount)
                               throws ScoringFilterException

Description copied from interface: ScoringFilter

Distribute score value from the current page to all its outlinked pages.

Specified by:

distributeScoreToOutlinks in interface ScoringFilter

Parameters:

fromUrl - url of the source page

scoreData - A list of OutlinkedScoreDatums for every outlink. These OutlinkedScoreDatums will be passed to #updateScore(String, OldWebTableRow, List) for every outlinked URL.

allCount - number of all collected outlinks from the source page

Throws:

ScoringFilterException

updateScore

public void updateScore(String url,
                        WebPage page,
                        List<ScoreDatum> inlinkedScoreData)
                 throws ScoringFilterException

Description copied from interface: ScoringFilter

This method calculates a new score during table update, based on the values contributed by inlinked pages.

Specified by:

updateScore in interface ScoringFilter

Parameters:

url - url of the page

Throws:

ScoringFilterException

indexerScore

public float indexerScore(String url,
                          NutchDocument doc,
                          WebPage page,
                          float initScore)
                   throws ScoringFilterException

Description copied from interface: ScoringFilter

This method calculates a Lucene document boost.

Specified by:

indexerScore in interface ScoringFilter

Parameters:

url - url of the page

doc - document. NOTE: this already contains all information collected by indexing filters. Implementations may modify this instance, in order to store/remove some information.

initScore - initial boost value for the Lucene document.

Returns:

boost value for the Lucene document. This value is passed as an argument to the next scoring filter in chain. NOTE: implementations may also express other scoring strategies by modifying Lucene document directly.

Throws:

ScoringFilterException