Greg K wrote:
Now, however, I'd like to be able restrict the search to certain documents
in the index, so I don't have to stream through a couple of thousand spans
to produce the 10 excerpts on a subset of the documents.
I've tried added a term to the SpanNearQueries that targets a keyword field
containing the document ids, but SNQ (understandably) can't handle that.
There isn't a SpanBooleanQuery and if I wrap the SpanOrQuery in a
BooleanQuery I'll lose access to the getSpans() method - same if I use a
Filter - can't get spans out of a Hits object, right?
Am I missing something? Is there a straightforward way to do what I'm trying
to do that I'm missing?
I think what you need is a SpanAndQuery, with a constructor like:
SpanAndQuery(SpanQuery spanQ, Query docsQ);
This would return the subset of spans matching spanQ whose documents
match docQ. This should not be too hard to implement. Its Spans
implementation might look something like:
private Spans spans;
private Scorer docs;
private boolean more;
public SpanAndSpans(SpanQuery spanQ, Query docQ,
IndexReader reader, Searcher searcher) {
spans = spanQ.getSpans(reader);
docs = docQ.weight(searcher).scorer(reader);
more = docs.next();
}
public boolean next() throws IOException {
if (!more) return false;
more = spans.next();
while (more) {
if (spans.doc() > docs.doc()) {
more = docs.skipTo(spans.doc());
} else if (spans.doc() < docs.doc()) {
more = spans.skipTo(docs.doc());
} else if (spans.doc() == docs.doc()) {
return true;
}
}
return false;
}
public boolean skipTo(int doc) throws IOException {
if (!more) return false;
more = docs.skipTo(doc);
return next();
}
This is untested and incomplete, but does it look like the right direction?
Doug
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
