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https://issues.apache.org/jira/browse/SOLR-1365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12832973#action_12832973
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Erik Hatcher commented on SOLR-1365:
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I'm not really sure why we have that constraint in SolrResourceLoader, and why
any class we load can't simply implement SolrCoreAware. But at the very least,
we can update this to support a SimilarityFactory for the sake of this issue.
+1
> Add configurable Sweetspot Similarity factory
> ---------------------------------------------
>
> Key: SOLR-1365
> URL: https://issues.apache.org/jira/browse/SOLR-1365
> Project: Solr
> Issue Type: New Feature
> Affects Versions: 1.3
> Reporter: Kevin Osborn
> Priority: Minor
> Fix For: 1.5
>
> Attachments: SOLR-1365.patch
>
>
> This is some code that I wrote a while back.
> Normally, if you use SweetSpotSimilarity, you are going to make it do
> something useful by extending SweetSpotSimilarity. So, instead, I made a
> factory class and an configurable SweetSpotSimilarty. There are two classes.
> SweetSpotSimilarityFactory reads the parameters from schema.xml. It then
> creates an instance of VariableSweetSpotSimilarity, which is my custom
> SweetSpotSimilarity class. In addition to the standard functions, it also
> handles dynamic fields.
> So, in schema.xml, you could have something like this:
> <similarity class="org.apache.solr.schema.SweetSpotSimilarityFactory">
> <bool name="useHyperbolicTf">true</bool>
> <float name="hyperbolicTfFactorsMin">1.0</float>
> <float name="hyperbolicTfFactorsMax">1.5</float>
> <float name="hyperbolicTfFactorsBase">1.3</float>
> <float name="hyperbolicTfFactorsXOffset">2.0</float>
> <int name="lengthNormFactorsMin">1</int>
> <int name="lengthNormFactorsMax">1</int>
> <float name="lengthNormFactorsSteepness">0.5</float>
> <int name="lengthNormFactorsMin_description">2</int>
> <int name="lengthNormFactorsMax_description">9</int>
> <float name="lengthNormFactorsSteepness_description">0.2</float>
> <int name="lengthNormFactorsMin_supplierDescription_*">2</int>
> <int name="lengthNormFactorsMax_supplierDescription_*">7</int>
> <float
> name="lengthNormFactorsSteepness_supplierDescription_*">0.4</float>
> </similarity>
> So, now everything is in a config file instead of having to create your own
> subclass.
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