I try to make a framework to manage distributed on persistant objects. The idea is to use interface to link objects, and use a specific component to create true object or proxy on distant object. To implement persistance facility, i want to use NHibernate.
The problem is that when a user try to make an HQL request on some object, i need to parse the request in HQL, suppress access on proxies objects and give to NHibernate the new modified HQL request to NHibernate.
My question is: how can i parse manually an HQL request, and manipulate the syntaxic tree of an HQL request?
I see that QueryTranslator can compile an HQL expression (nothing is write in documentation), is it the good choice? how can I use it?

An sorry for my english...I'm french

Don't know it this is what you need. This let's you access at the native SQL, not the HQL:

org.hibernate.Interceptor.onPrepareStatement(String sql)

No, i want to have an object model of an HQL request, like a tree of IParser objects (see NHibernate.Hql.ClauseParser for example)

I want to know How to use this tree of tokens language objects, in order to change the tree and regenerating a new transformed HQL request

ohé? is there anybody here which can give me a response for my problem?

The closest thing that exist is QueryTransalator, and it is definately not an AST.

what do you mean, when you said "AST"?

Abstract Syntax Tree.
The object model for the HQL

OK, queryTranslator is not an AST, but how can I use it? is it possible to create it from an string HQL, modify it (explicitely navigate in IParser sub-objects and casting it), an ask for th new HQL request? can you give a (short) example? (for example, suppress one test in a where clause)

is it possible to have a response, even like 'I don't know' from a contributor?

HQL parsing code was not intended to be used outside of NHibernate, so you'll have to dig into it and see for yourself what can be done.

Off the top of my head, I would say that it would be easier to take the Antlar code from Hibernate 3.0, generate C# AST, and work with that.
On the end, though, you'll need to return it to HQL string to send it to NH again, since it doesn't understand it.

do you mean I need to convert java code of Hibernate 3.0?

I try to execute :

IParser parser = new PreprocessingParser(new Hashtable());
QueryTranslator translator=new QueryTranslator(factory,"requete HQL",new Hashtable());
ParserHelper.Parse(parser,"requete HQL" ,ParserHelper.HqlSeparators, translator);

using debugger, and I see that a lot of internal variables (like child in all clauseParser) may be interesting to use (to get all sub-clause and theirs propeties) but actually it's not possible because all fields are declared private

May be it was more interesting to just make theirs fields protected (and let's a good developer make it's own parser) ...

Do you need to send the query over the network? Does it need to be HQL? Would it be possible to parse the HQL and create criteria with it by creating EqExpression, AndExpression, etc. yourself and then using this to query? After looking at the code, it looks like this is something that is being considered for the HQL parser that is built in.