com.atlassian.confluence.search.v2.lucene.boosting
Class BoostByModificationDateStrategy

java.lang.Object
  com.atlassian.confluence.search.v2.lucene.boosting.BoostByModificationDateStrategy

All Implemented Interfaces:

BoostingStrategy

public class BoostByModificationDateStrategy
extends Object
implements BoostingStrategy

A BoostingStrategy that boost the scores based on the modification date of scored document. Recently modified Document get a higher boost.

Constructor Summary

BoostByModificationDateStrategy()

Method Summary

float	boost(org.apache.lucene.index.IndexReader reader, int doc, float score) Apply a relevant boost to the specified document with the specified score.
float	boost(org.apache.lucene.index.IndexReader reader, Map<String,Object> params, int doc, float score) Apply a relevant boost to the specified document with the specified score.
float	boost(org.apache.lucene.index.IndexReader reader, SearchQueryParameters searchQueryParameters, int doc, float score) Apply a relevant boost to the specified document with the specified score.

Methods inherited from class java.lang.Object

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

Constructor Detail

BoostByModificationDateStrategy

public BoostByModificationDateStrategy()

Method Detail

boost

public float boost(org.apache.lucene.index.IndexReader reader,
                   int doc,
                   float score)
            throws IOException

Description copied from interface: BoostingStrategy

Apply a relevant boost to the specified document with the specified score. Returning a score of 0 will remove the document from the results.

Warning: This method needs to return extremely fast, so any I/O like using the index reader to load the actual document is discouraged. If you need access to a documents field values you should rather consider using a FieldCache instead.

Specified by:

boost in interface BoostingStrategy

Parameters:

reader - a reader instance associated with the current scoring process

doc - the doc id

score - the original score for the document specified by doc

Returns:

the boosted score, 0 to remove the document from the results, or score to make no change to the score

Throws:

IOException

boost

public float boost(org.apache.lucene.index.IndexReader reader,
                   Map<String,Object> params,
                   int doc,
                   float score)
            throws IOException

Description copied from interface: BoostingStrategy

Apply a relevant boost to the specified document with the specified score. Returning a score of 0 will remove the document from the results.

Warning: This method needs to return extremely fast, so any I/O like using the index reader to load the actual document is discouraged. If you need access to a documents field values you should rather consider using a FieldCache instead.

Specified by:

boost in interface BoostingStrategy

Parameters:

reader - a reader instance associated with the current scoring process

params - extra state information used by more complex boosting strategies

doc - the doc id

score - the original score for the document specified by doc

Returns:

the boosted score, 0 to remove the document from the results, or score to make no change to the score

Throws:

IOException

boost

public float boost(org.apache.lucene.index.IndexReader reader,
                   SearchQueryParameters searchQueryParameters,
                   int doc,
                   float score)
            throws IOException

Description copied from interface: BoostingStrategy

Apply a relevant boost to the specified document with the specified score. Returning a score of 0 will remove the document from the results.

Warning: This method needs to return extremely fast, so any I/O like using the index reader to load the actual document is discouraged. If you need access to a documents field values you should rather consider using a FieldCache instead.

If you are implementing this method but do not use the searchQueryParameters, it is safe to delegate directly to the boost(IndexReader, int, float) method.

Specified by:

boost in interface BoostingStrategy

Parameters:

reader - a reader instance associated with the current scoring process

searchQueryParameters - extra state information used by more complex boosting strategies

doc - the doc id

score - the original score for the document specified by doc, or score to make no change to the score

Returns:

the boosted score or 0 to remove the document from the results

Throws:

IOException