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 java.lang.Object
      implements ScoringFilter

- - ### Field Summary

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

      `X_POINT_ID`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `LinkAnalysisScoringFilter()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `distributeScoreToOutlinks(java.lang.String fromUrl, WebPage page, java.util.Collection<ScoreDatum> scoreData, int allCount)` Distribute score value from the current page to all its outlinked pages.
    `float` | `generatorSortValue(java.lang.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()`
    `java.util.Collection<WebPage.Field>` | `getFields()`
    `float` | `indexerScore(java.lang.String url, NutchDocument doc, WebPage page, float initScore)` This method calculates a Lucene document boost.
    `void` | `initialScore(java.lang.String url, WebPage page)` Set an initial score for newly discovered pages.
    `void` | `injectedScore(java.lang.String url, WebPage page)` Set an initial score for newly injected pages.
    `void` | `setConf(Configuration conf)`
    `void` | `updateScore(java.lang.String url, WebPage page, java.util.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 java.util.Collection<WebPage.Field> getFields()

      Specified by:
        `getFields` in interface `FieldPluggable`

    - #### injectedScore

          public void injectedScore(java.lang.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(java.lang.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(java.lang.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
        `page` - `WebPage` object relative to the URL
        `initSort` - initial sort value, or a value from previous filters in chain
      Throws:
        `ScoringFilterException`

    - #### distributeScoreToOutlinks

          public void distributeScoreToOutlinks(java.lang.String fromUrl,
                                                WebPage page,
                                                java.util.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 `ScoreDatum`
        `allCount` - number of all collected outlinks from the source page
      Throws:
        `ScoringFilterException`

    - #### updateScore

          public void updateScore(java.lang.String url,
                                  WebPage page,
                                  java.util.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
        `page` - `WebPage` object relative to the URL
        `inlinkedScoreData` - list of `ScoreDatum`s for all inlinks pointing to this URL.
      Throws:
        `ScoringFilterException`

    - #### indexerScore

          public float indexerScore(java.lang.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`

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