PATCH: XSLTServletFilter
------------------------
Key: SOLR-49
URL: http://issues.apache.org/jira/browse/SOLR-49
Project: Solr
Issue Type: New Feature
Components: search
Environment: Tested on macosx 10.4.7, JDK 1.5.0_06
Reporter: Bertrand Delacretaz
Priority: Minor
Patch that implements server-side XSLT transforms of query results.
The filter is activated by using select/html instead of select/ to run queries,
and optionally adding a transform parameter to specify the XSLT transform to
use, for example:
http://localhost:8983/solr/select/html?q=usage&transform=my.xsl
In which case my.xsl should be found in solr/conf/xslt/ with the example
configuration. The default transform (solr/conf/xslt/query-to-html.xsl) outputs
a simplistic HTML format.
Performance is suboptimal, as the filter reparses the XML output generated by
Solr. Modifying the XMLWriter to output to a ContentHandler would be more
efficient, but I didn't have time to go that far.
The TransformerProvider trivially caches the last Transformer used, could be
improved using an LRU cache of several transformers, I haven't checked if
Solr's infrastructure contains such an animal already.
The patch is all new files, except for adding this in web.xml before the first
<servlet>:
<filter>
<filter-name>xslt</filter-name>
<filter-class>org.apache.solr.xslt.XSLTServletFilter</filter-class>
</filter>
<!-- apply the XSLT filter when select/html is used to make queries -->
<filter-mapping>
<filter-name>xslt</filter-name>
<url-pattern>/select/html/*</url-pattern>
</filter-mapping>
I've left the client-side XSLT stuff (stylesheet parameter) as is for the
moment.
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