http://lucene.apache.org/java/docs/api/org/apache/lucene/search/MatchAllDocsQuery.html
You can use that Query in front of a NOT query clause.
Greg Gershman wrote:
I'm attempting to create a profanity filter. I thought to use a QueryFilter
created with a Query of (-$#!+ AND [EMAIL PROTECTED] AND etc). The problem I
have run into is that, as a pure negative query is not supported (a query for
(-term) DOES NOT return the inverse of a query for (term)), I believe the bit
set returned by a purely negative QueryFilter is empty, so no matter how many
results returned by the initial query, the result after filtering is always
zero documents.
I was wondering if anyone had suggestions as to how else to do this. I've
considered simply amending the query string submitted by the user to include a
pre-generated String that would exclude the query terms, but I consider this a
non-elegant solution. I had also thought about creating a new sub-class of
QueryFilter, NegativeQueryFilter. Basically, it would works just like a
QueryFilter, taking a positive query (so, I would pass it an OR'ed list of
profane words), then the resulting bits are simply flipped. I think this would
work, unless I'm missing something. I'm going to experiment with it, I'd
appreciate anyone's thoughts on this.
Thanks,
Greg
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