Don't know if anyone else has been building QueryFilter extensions, but here's a quick question. In the filter method that needs to be implemented as part of the QueryFilter interface, the method looks like this:
public BooleanQuery filter(Query input, BooleanQuery translation)
Query is a Nutch class and BooleanQuery is a Lucene class, and as far as I can tell, there isn't a straightforward way to make them talk to each other.
That's what query filters are for: to translate Nutch queries into Lucene queries. The Nutch Query passed in is what Nutch's query parser built from the user's input. The BooleanQuery is what other translators have built so far, and the returned result is the modified version of this that this filter constructs.
No examples to help either :( The plugins that come with v0.5 use the RawFieldQueryFilter...
Did you look at the implementation of RawFieldQueryFilter? Or the implementation of BasicQueryFilter, in query-basic? What these do is iterate through the clauses of the Nutch query, looking for clauses that they're responsible for, and adding corresponding clauses to the resulting Lucene BooleanQuery.
Does that help?
Doug
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