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 < 6.0 = ClassicSimilarityluceneMatchVersion >= 6.0 = 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. In particular please consider carefully the documentation
& implementation of Similarity.coord(int, int) and Similarity.queryNorm(float) in
ClassicSimilarity compared to 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, getParamspublic void inform(SolrCore core)
inform in interface SolrCoreAwarepublic void init(SolrParams args)
init in class SimilarityFactorypublic Similarity getSimilarity()
getSimilarity in class SimilarityFactoryCopyright © 2000-2017 Apache Software Foundation. All Rights Reserved.