Package org.apache.solr.ltr.feature
Class FieldLengthFeature
- java.lang.Object
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- org.apache.lucene.search.Query
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- org.apache.solr.ltr.feature.Feature
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- org.apache.solr.ltr.feature.FieldLengthFeature
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- All Implemented Interfaces:
org.apache.lucene.util.Accountable
public class FieldLengthFeature extends Feature
This feature returns the length of a field (in terms) for the current document. Example configuration:{ "name": "titleLength", "class": "org.apache.solr.ltr.feature.FieldLengthFeature", "params": { "field": "title" } }
Note: since this feature relies on norms values that are stored in a single byte the value of the feature could have a lightly different value. (see alsoClassicSimilarity
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Nested Class Summary
Nested Classes Modifier and Type Class Description class
FieldLengthFeature.FieldLengthFeatureWeight
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Nested classes/interfaces inherited from class org.apache.solr.ltr.feature.Feature
Feature.FeatureWeight
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Constructor Summary
Constructors Constructor Description FieldLengthFeature(String name, Map<String,Object> params)
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Method Summary
All Methods Instance Methods Concrete Methods 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
getField()
LinkedHashMap<String,Object>
paramsToMap()
void
setField(String field)
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
defaultParamsToMap, equals, getDefaultValue, getIndex, getInstance, getName, hashCode, ramBytesUsed, setDefaultValue, setIndex, toString, visit
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Methods inherited from class org.apache.lucene.search.Query
classHash, createWeight, rewrite, rewrite, sameClassAs, toString
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Method Detail
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getField
public String getField()
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setField
public void setField(String field)
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paramsToMap
public LinkedHashMap<String,Object> paramsToMap()
- Specified by:
paramsToMap
in classFeature
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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 classFeature
- Throws:
FeatureException
- Feature Exception
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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 classFeature
- Throws:
IOException
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