On Feb 7, 2006, at 1:09 AM, Daniel Noll wrote:
I've got an unusual (if not crazy) question about implementing
custom queries.
Basically we have a UI where a user can enter a query and then
select a bunch of filters to be applied to the query. These
filters are currently implemented using a fairly simple wrapper
around Lucene's own Filter class.
Now we have one particular customer who says he wants to AND and OR
these filters in various combinations. Now, I know that this is
possible on the model side, because I've already created AndFilter
and OrFilter classes to do this sort of thing. However, the view
of the user interface would be impossible to keep simple if I were
to bulk it up to support this kind of filtering.
One thing that may be of use is the ChainedFilter:
http://svn.apache.org/repos/asf/lucene/java/trunk/contrib/
miscellaneous/src/java/org/apache/lucene/misc/ChainedFilter.java
Is it possible to customise the QueryParser so that it returns
Query instances that have no relationship to the text index
whatsoever? For instance, many of our existing filters build their
bitsets exclusively using a database, and we would need to keep
this as-is because we don't want to modify the text index itself.
I don't really follow what you're after here. Could you give a
concrete example of what you're after with "query" parsing?
It's certainly feasible to build a custom parser (JavaCC or
otherwise) that does whatever you want, but that can be quite a
complex endeavor.
Erik
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