[Yanel-dev] [Fwd: Re: master plan for jsr 283 query implementation]

[Michael Wechner]

Hi

I think this is good for us to know.

Cheers

Michi

-------- Original Message --------
Subject: 	Re: master plan for jsr 283 query implementation
Date: 	Mon, 10 Sep 2007 19:00:39 +0200
From: 	Christoph Kiehl <christoph at sulu3000.de>
Reply-To: 	dev at jackrabbit.apache.org
To: 	dev at jackrabbit.apache.org
References: 	<46DFB804.4040809 at gmx.net>



Marcel Reutegger wrote:

> well, those are actually just my thoughts how I think we should 
> implement the query enhancements specified in JSR 283.
> 
> there are basically three major blocks that we need to implement:
> 
> - JQOM, allows you to programmatically create a query
> - JCR-SQL2, the new SQL query syntax
> - additional query features (joins, etc.)
> 
> In a first step I already introduced temporary interfaces for the JQOM 
> and implementing classes.
> 
> I'd like to keep the current design of the query sub system for a while 
> until we are ready to switch to the new JQOM as the basis for syntax 
> independent query representation.
> 
> That is, in a first phase my suggestion is the following:
> 
> XPath---+
>         +--->AQT----+
> SQL-----+           +---->LuceneQuery
>                     |
> SQL2------->JQOM----+
> 
> 
> AQT: abstract query tree
> 
> And once the path SQL2->JQOM->LuceneQuery is stable:
> 
> XPath---+     AQT (deprecated)
>         |
> SQL-----+---->JQOM----->LuceneQuery
>         |
> SQL2----+
> 
> 
> Comments and suggestions are welcome.

+1. Sounds reasonable. Do you want to use javacc for SQL2 parsing?

Cheers,
Christoph



-- 
Michael Wechner
Wyona      -   Open Source Content Management - Yanel, Yulup
http://www.wyona.com
michael.wechner at wyona.com, michi at apache.org
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