On Thursday 20 October 2005 00:40, Sean O'Connor wrote: > Hello, > I have user entered search commands which I want to convert to > SpanQueries. I have seen in the book "Lucene in Action" that no parser > existed at time of publication, but there was someone working on a > SpanQuery parser. Can anyone point me to that code, or provide any > suggestions? > > I want to use SpanQueries for their detail on the number of hits > from a query, and more importantly, the location (position start and > end) of each hit. My application requires me to do precise hit > highlighting. I also need to perform calculations on the number of hits > per document, as well as per query (sum of document hits).
You may want to use the getSpans() method of SpanQuery and operate on the result directly. > It is fairly critical I highlight the hits, and only the hits. From > what I've read SpanQueries (with dumpSpans) is a better approach than > using 'regular' queries. I _think_ regular queries currently use a > highlighter which shows all terms highlighted. This can give more > highlighting than actual hits (i.e false positives). > > So, that being said, should I stick with SpanQueries? Is there any > current work on a parser to convert a string, or regular (Token, > Boolean, Phrase, Prefix,...) query into a SpanQuery? > > I have written some very duct tape-ish code which will convert basic > booleanOR and prefix queries into SpanQueries. I just realized I'm in > deeper water than I expected when I tried converting my first query > string containing several boolean queries, AND a phrase query. So now I > am looking to either help an existing effort, or just continue with my > own hacking. :) Have a look at the surround query parser in the svn trunk: http://svn.apache.org/viewcvs.cgi/lucene/java/trunk/contrib/surround/ There is also some code that does highlighting based on Spans, but I don't know where that is. Hopefully someone else can point you at that. Regards, Paul Elschot --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
