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Posted to dev@cocoon.apache.org by Colin Paul Adams <co...@colina.demon.co.uk> on 2004/07/14 13:28:47 UTC

Accessing Berkeley DB XML documents

I wish to access an XML document stored within Berkeley DB XML (bdbxml). 
The java interface to dbdxml ultimately returns a document as a
byte[], containing the text of the XML document, although the
interface is quite complicated, and is not at all SQL-like.

I am trying to work out the best way of approaching this. 
One idea that occures to me is to use the ordinary file generator,
along with a SourceResolver to resolve URIs beginning with bdbxml:.

Does this sound like a sensible approach, and if so, how do I tell the
file generator to use the custom SourceResolver?
-- 
Colin Paul Adams
Preston Lancashire

Re: Accessing Berkeley DB XML documents

Posted by Colin Paul Adams <co...@colina.demon.co.uk>.
>>>>> "Vadim" == Vadim Gritsenko <va...@reverycodes.com> writes:

    >> and if so, how do I tell the file generator to use the custom
    >> SourceResolver?
    >> 

    Vadim> Why do you need "custom SourceResolver"??? Just use the
    Vadim> regular one. See any of other source implementations as an
    Vadim> example.

Please point me to an example, as I have no idea what to look for.
-- 
Colin Paul Adams
Preston Lancashire

Re: Accessing Berkeley DB XML documents

Posted by Colin Paul Adams <co...@colina.demon.co.uk>.
>>>>> "Martin" == Martin Holz <ho...@fiz-chemie.de> writes:

    Vadim> Why do you need "custom SourceResolver"??? Just use the
    Vadim> regular one. See any of other source implementations as an
    Vadim> example.
    >>  I've been looking at XMLDBSource and XMLDBSourceFactory.
    >> 
    >> I guess there must be some way that cocoon knows to associate
    >> the xmldb scheme with these, but I can't figure out what it is.
    >> Nor what a SourceFactory is for.

    Martin> Yes, look into cocoon.xconf. There is a section
    Martin> "source-factories", which associates protocols with
    Martin> SourceFactories. Whenever a source of certain type is
    Martin> required, the coresponding's SourceFactory method
    Martin> getSource() is called by the SourceResolver.

Thanks. it all makes sense now.
-- 
Colin Paul Adams
Preston Lancashire

Re: Accessing Berkeley DB XML documents

Posted by Martin Holz <ho...@fiz-chemie.de>.
Colin Paul Adams <co...@colina.demon.co.uk> writes:

> >>>>> "Vadim" == Vadim Gritsenko <va...@reverycodes.com> writes:
> 
>     >> and if so, how do I tell the file generator to use the custom
>     >> SourceResolver?
>     >> 
> 
>     Vadim> Why do you need "custom SourceResolver"??? Just use the
>     Vadim> regular one. See any of other source implementations as an
>     Vadim> example.
> 
> I've been looking at XMLDBSource and XMLDBSourceFactory.
> 
> I guess there must be some way that cocoon knows to associate the
> xmldb scheme with these, but I can't figure out what it is.
> Nor what a SourceFactory is for.

Yes, look into cocoon.xconf. There is a section 
"source-factories", which associates protocols with
SourceFactories. Whenever a source of certain
type is required, the coresponding's  SourceFactory
method getSource() is called by the SourceResolver.

Martin

Re: Accessing Berkeley DB XML documents

Posted by Colin Paul Adams <co...@colina.demon.co.uk>.
>>>>> "Vadim" == Vadim Gritsenko <va...@reverycodes.com> writes:

    >> and if so, how do I tell the file generator to use the custom
    >> SourceResolver?
    >> 

    Vadim> Why do you need "custom SourceResolver"??? Just use the
    Vadim> regular one. See any of other source implementations as an
    Vadim> example.

I've been looking at XMLDBSource and XMLDBSourceFactory.

I guess there must be some way that cocoon knows to associate the
xmldb scheme with these, but I can't figure out what it is.
Nor what a SourceFactory is for.
-- 
Colin Paul Adams
Preston Lancashire

Re: Accessing Berkeley DB XML documents

Posted by Vadim Gritsenko <va...@reverycodes.com>.
Colin Paul Adams wrote:

>I wish to access an XML document stored within Berkeley DB XML (bdbxml). 
>The java interface to dbdxml ultimately returns a document as a
>byte[], containing the text of the XML document, although the
>interface is quite complicated, and is not at all SQL-like.
>
>I am trying to work out the best way of approaching this. 
>One idea that occures to me is to use the ordinary file generator,
>along with a SourceResolver to resolve URIs beginning with bdbxml:.
>
>Does this sound like a sensible approach,
>

Yes


> and if so, how do I tell the
>file generator to use the custom SourceResolver?
>  
>

Why do you need "custom SourceResolver"??? Just use the regular one. See 
any of other source implementations as an example.

Vadim