Package org.apache.solr.ltr.feature

Class SolrFeature

java.lang.Object

org.apache.lucene.search.Query

org.apache.solr.ltr.feature.Feature

org.apache.solr.ltr.feature.SolrFeature

public class SolrFeature
extends Feature

This feature allows you to reuse any Solr query as a feature. The value of the feature will be the score of the given query for the current document. See Solr documentation of other parsers you can use as a feature. Example configurations:

[{ "name": "isBook",
  "class": "org.apache.solr.ltr.feature.SolrFeature",
  "params":{ "fq": ["{!terms f=category}book"] }
},
{
  "name":  "documentRecency",
  "class": "org.apache.solr.ltr.feature.SolrFeature",
  "params": {
      "q": "{!func}recip( ms(NOW,publish_date), 3.16e-11, 1, 1)"
  }
}]

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	SolrFeature.SolrFeatureWeight	Weight for a SolrFeature

Nested classes/interfaces inherited from class org.apache.solr.ltr.feature.Feature

Feature.FeatureWeight

Field Summary

Fields inherited from class org.apache.solr.ltr.feature.Feature

name

Constructor Summary

Constructors

Constructor	Description
SolrFeature(String name, Map<String,Object> params)

Method Summary

Modifier and Type	Method	Description
Feature.FeatureWeight	createWeight(org.apache.lucene.search.IndexSearcher searcher, boolean needsScores, SolrQueryRequest request, org.apache.lucene.search.Query originalQuery, Map<String,String[]> efi)
String	getDf()
List<String>	getFq()
String	getQ()
LinkedHashMap<String,Object>	paramsToMap()
void	setDf(String df)
void	setFq(List<String> fq)
void	setQ(String q)
protected void	validate()	As part of creation of a feature instance, this function confirms that the feature parameters are valid.

Methods inherited from class org.apache.solr.ltr.feature.Feature

equals, getDefaultValue, getIndex, getInstance, getName, hashCode, setDefaultValue, setIndex, toString, visit

Methods inherited from class org.apache.lucene.search.Query

classHash, createWeight, rewrite, sameClassAs, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

SolrFeature

public SolrFeature(String name,
                   Map<String,Object> params)

Method Detail

getDf

public String getDf()

setDf

public void setDf(String df)

getQ

public String getQ()

setQ

public void setQ(String q)

getFq

public List<String> getFq()

setFq

public void setFq(List<String> fq)

paramsToMap

public LinkedHashMap<String,Object> paramsToMap()

Specified by:

paramsToMap in class Feature

createWeight

public Feature.FeatureWeight createWeight(org.apache.lucene.search.IndexSearcher searcher,
                                          boolean needsScores,
                                          SolrQueryRequest request,
                                          org.apache.lucene.search.Query originalQuery,
                                          Map<String,String[]> efi)
                                   throws IOException

Specified by:

createWeight in class Feature

Throws:

IOException

validate

protected void validate()
                 throws FeatureException

Description copied from class: Feature

As part of creation of a feature instance, this function confirms that the feature parameters are valid.

Specified by:

validate in class Feature

Throws:

FeatureException - Feature Exception