[infinispan-dev] [hibernate-dev] [HSearch] DSL for Lucene queries (was: Re: Query module new

[Manik Surtani]

Lexers are parsers are not difficult (a simple ANTLR grammar takes  
very little effort, for example), but that is orthoginal to this  
discussion.  I believe the very term DSL is misleading (since DSL  
implies a separate grammar), but this is more for an intuitive builder  
API for query creation.  And yes, while this does imply knowledge of  
the API, it is certainly far less verbose and more expressive than the  
existing query construction mechanism.

Perhaps as a next step, a grammar can be built on top of this.

- Manik


On 25 Sep 2009, at 18:41, Navin Surtani wrote:

> Incase this email didn't go to the full dev-list. I got it as a  
> separate thread so forwarding on.
>
> Begin forwarded message:
>
>> From: johng.sst at gmail.com
>> Date: 25 September 2009 16:00:53 BST
>> To: Navin Surtani <nsurtani at redhat.com>
>> Subject: Re: Re: [hibernate-dev] [infinispan-dev] [HSearch] DSL for  
>> Lucene  queries (was: Re: Query module new
>>
>> All,
>>
>> I think Hardy's original push back came from the first pass' use of  
>> the decorator pattern to try to come up with a DSL. That really  
>> isn't much better than knowing the API. The alternate is to come up  
>> with a more natural language implementation but that leads to  
>> parsers, lexers, etc... I'm not saying it's not worth while but it  
>> may be a lot of work.
>>
>> John Griffin
>>
>> On Sep 25, 2009 8:12am, Navin Surtani <nsurtani at redhat.com> wrote:
>> > Just wanted to get this topic re-started again.
>> >
>> >
>> >
>> >
>> >
>> > Essentially what I think this project/DSL/module/thingy-bob is  
>> thought
>> >
>> > to become: -
>> >
>> >
>> >
>> > A simple package where a user can build Lucene queries without  
>> having
>> >
>> > to know too much about Lucene itself. If I'm headed down the wrong
>> >
>> > thought path then just thwack me.
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > On 26 Aug 2009, at 21:08, Hardy Ferentschik wrote:
>> >
>> >
>> >
>> > > On Wed, 2009-08-26 at 13:39 +0200, Emmanuel Bernard wrote:
>> >
>> > >> I've been thinking about a DSL to build Lucene queries in the  
>> last
>> >
>> > >> day.
>> >
>> > >> What do you think of this proposal?
>> >
>> > >
>> >
>> > > What do you really gain compared to native Lucene queries?
>> >
>> >
>> >
>> > What's gained I believe is the fact that people can build complex
>> >
>> > lucene queries easier. Currently, it's a bit clunky imo so if we
>> >
>> > provide a cleaner way to build them it can prove beneficial to any
>> >
>> > lucene user (myself included for querying on Infinispan).
>> >
>> >
>> >
>> > Any other thoughts?
>> >
>> >
>> >
>> >
>> >
>> > > If your API achieves exactly the same as what's possible with  
>> Lucene
>> >
>> > > it is just a 'useless' wrapper.
>> >
>> > >
>> >
>> > > A wrapper around native Lucene queries would make sense if it  
>> could
>> >
>> > > somehow use some of the Hibernate Search specific meta data. As  
>> an
>> >
>> > > extreme example one could generate some meta classes a la JPA2.  
>> This
>> >
>> > > way
>> >
>> > > one could ensure that you can get help with which field names are
>> >
>> > > available.
>> >
>> > >
>> >
>> > > --Hardy
>> >
>> > >
>> >
>> > > _______________________________________________
>> >
>> > > infinispan-dev mailing list
>> >
>> > > infinispan-dev at lists.jboss.org
>> >
>> > > https://lists.jboss.org/mailman/listinfo/infinispan-dev
>> >
>> >
>> >
>> > Navin Surtani
>> >
>> >
>> >
>> > Intern Infinispan
>> >
>> > Intern JBoss Cache Searchable
>> >
>> >
>> >
>> > _______________________________________________
>> >
>> > hibernate-dev mailing list
>> >
>> > hibernate-dev at lists.jboss.org
>> >
>> > https://lists.jboss.org/mailman/listinfo/hibernate-dev
>> >
>
> Navin Surtani
>
> Intern Infinispan
> Intern JBoss Cache Searchable
>
> _______________________________________________
> infinispan-dev mailing list
> infinispan-dev at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/infinispan-dev

--
Manik Surtani
manik at jboss.org
Lead, Infinispan
Lead, JBoss Cache
http://www.infinispan.org
http://www.jbosscache.org




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