public class SchemaSimilarityFactory extends SimilarityFactory implements SolrCoreAware
SimilarityFactory
that returns a global PerFieldSimilarityWrapper
that delegates to the field type, if it's configured. For field types that
do not have a Similarity
explicitly configured, the global Similarity
will use per fieldtype defaults -- either based on an explicitly configured
defaultSimFromFieldType
a sensible default depending on the Version
matching configured:
luceneMatchVersion < 8.0
= LegacyBM25Similarity
luceneMatchVersion >= 8.0
= BM25Similarity
The defaultSimFromFieldType
option accepts the name of any fieldtype, and uses
whatever Similarity
is explicitly configured for that fieldType as the default for
all other field types. For example:
<similarity class="solr.SchemaSimilarityFactory" > <str name="defaultSimFromFieldType">type-using-custom-dfr</str> </similarity> ... <fieldType name="type-using-custom-dfr" class="solr.TextField"> ... <similarity class="solr.DFRSimilarityFactory"> <str name="basicModel">I(F)</str> <str name="afterEffect">B</str> <str name="normalization">H3</str> <float name="mu">900</float> </similarity> </fieldType>
In the example above, any fieldtypes that do not define their own </similarity/>
will use the Similarity
configured for the type-using-custom-dfr
.
NOTE: Users should be aware that even when this factory uses a single default
Similarity
for some or all fields in a Query, the behavior can be inconsistent
with the behavior of explicitly configuring that same Similarity
globally, because
of differences in how some multi-field / multi-clause behavior is defined in
PerFieldSimilarityWrapper
.
FieldType.getSimilarity()
CLASS_NAME, params
Constructor and Description |
---|
SchemaSimilarityFactory() |
Modifier and Type | Method and Description |
---|---|
Similarity |
getSimilarity() |
void |
inform(SolrCore core) |
void |
init(SolrParams args) |
getClassArg, getNamedPropertyValues, getParams
public void inform(SolrCore core)
inform
in interface SolrCoreAware
public void init(SolrParams args)
init
in class SimilarityFactory
public Similarity getSimilarity()
getSimilarity
in class SimilarityFactory
Copyright © 2000-2020 Apache Software Foundation. All Rights Reserved.