Yes, custom coded Queries can allow you that. Whatever is not possible to do through Queries, you can do using Filters (but Queries are cheaper).
Implementing your own index input/output classes - that's possible as well by writing your own Directory class with accompanying IndexInput/IndexOutput clases if necessary. Depending on what you're exactly after you may be a bit limited by the core structure. The core could be ammended to support edge cases if those will be required. Isidor has done a bit work on that field, have a look at our git repository in his branch (isidor_working), and in directory_refactor and mpi branches. Specifically you might find commits 802e6b5b4b395010a253cd3a42fcb9904dd37db9 and 312185204d54367db77f5b8538e8cf42c5d6d594 useful. A word of advice - don't ever use DB to store indexing data. This will significantly slow down your implementation. Itamar. -----Original Message----- From: Paul J. Lucas [mailto:p...@lucasmail.org] Sent: Tuesday, January 05, 2010 10:28 PM To: clucene-developers@lists.sourceforge.net Subject: Re: [CLucene-dev] Using CLucene to implement XQuery full-text search No, I do not mean parsing a query string. There is a separate parser that parses the full XQuery language of which full-text searching is a small part. The parser builds an AST. It will then be my job to walk the AST and look for full-text query nodes. I then convert those into a Query object by using the various query classes, e.g., SpanQuery. Hence, I would not be using the built-in CLucene QueryParser. What I want to know is if the framework for CLucene is expressive enough to be able to handle the criteria I listed below. To elaborate: will I be able to construct/perform queries that: + have a word or phrase that occurs at least/most N times can use or not + use stop-words on a query-by-query basis can use wildcards can be + case-sensitive or insensitive can be diacritical-mark-sensitive or + insensitive can keep track of things like sentences and paragraphs Yes, I am willing to write my own derived classes. Also, I thought of another question: can I implement my own index input/output classes so that CLucene stores/retrieves its index data using a mechanism of my choice? I.e., if I didn't want to use the binary index files that CLucene normally creates but instead wanted to store the data inside blobs in a SQL database, could I by writing my own classes to do that? - Paul On Jan 5, 2010, at 11:43 AM, Itamar Syn-Hershko wrote: > Hi Paul, > > What do you mean by that? > > CLucene should be handed with a Query object to perform a search, > which could then be filtered using a Filter object (this to allow for > more complex searches). Producing a Query object from a plain-text > string is done by using a QueryParser; a default one comes with > CLucene itself, but anyone can implement his own should the need > arise. Same goes for Queries and Filters - you can create your own derived class to perform searches the way you want. > > So if by "hand-coded" you mean creating your own classes, then yes, it can. > > Itamar. > > -----Original Message----- > From: Paul J. Lucas [mailto:p...@lucasmail.org] > Sent: Monday, January 04, 2010 10:20 PM > To: clucene-developers@lists.sourceforge.net > Subject: [CLucene-dev] Using CLucene to implement XQuery full-text > search > > Hi - > > I'm looking at CLucene to implement the full-text search feature of XQuery: > > http://www.w3.org/TR/xpath-full-text-10/ > > Its query abilities are the most complicated I've seen. Specifically, > it allows one specify the following as part of a query: > > + occurs at {least|most} {N} times > + {with|without} stop words > + {with|without} wildcards > + case sensitive | lowercase | uppercase diacritics insensitive > + {same|different} {sentence|paragraph} at {start|end} | entire > + content > > Can CLucene do all that if the queries are hand-coded? Thanks. > > - Paul ---------------------------------------------------------------------------- -- This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ CLucene-developers mailing list CLucene-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/clucene-developers ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ CLucene-developers mailing list CLucene-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/clucene-developers
