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From "Michiel Kalkman" <michielgkalk...@gmail.com>
Subject Re: [Commons Config]URL resolving
Date Mon, 12 Jun 2006 12:12:22 GMT
Oliver,
I created http://issues.apache.org/jira/browse/CONFIGURATION-215

I also did a kind of brainstorm on possible solutions. They are in this
item.

Of course, I am a user and not an implementer (yet ?), so I have no say in
which one (if any) should be done.

Anyway, thanks for your answers and for your efforts.

Regards,
Michiel


On 6/10/06, Oliver Heger <oliver.heger@oliver-heger.de> wrote:
>
> Okay, I think I got it now. You would like to have a predefined variable
> like ${config_url} for instance, which is automatically replaced by the
> URL of the current configuration file, right?
>
> Well, ATM this is not supported, but I think, it is a good idea. Maybe
> it would make sense to have more of these predefined variables providing
> meta information about the current set of properties (e.g. configuration
> class, time when the file was loaded, etc.)?
>
> Would you please so kind to open a new enhancement request in JIRA, so
> that the idea won't get lost? (see [1])
>
> I plan to change/enhance the interpolation features anyway; this would
> be an opportunity to implement this new feature.
>
> Thanks.
> Oliver
>
> [1] http://jakarta.apache.org/commons/configuration/issue-tracking.html
>
> Michiel Kalkman wrote:
> > hm,
> > let me try again...
> >
> > This was the original situation:
> > root/A/config.xml
> > root/A/specificConfigForB.xml
> > root/A/log4jConfigForB.xml
> >
> > I want to retrieve the URL of the log4jConfigForB.xml which is specified
> > relative to specificConfigForB.xml.
> >
> > I know the URL for root/A/config.xml.
> > This file imports specificConfigForB.xml which specifies the name of the
> > log4j config file.
> > The URL to the log4j config file was constructed through new URL(
> > 'root/A/config.xml', 'log4jConfigForB.xml'). The result is
> > root/A/log4jConfigForB.xml
> >
> > However, when specificConfigForB.xml and log4jConfigForB.xml move to
> root/B
> > (or whereever) the result will still be root/A/log4jConfigForB.xml.
> > Which is
> > clearly wrong.
> >
> > I prefer not having to specify an absolute URL to log4jConfigForB.xml.
> > Adding the content of log4jConfigForB.xml to specificConfigForB.xml is
> also
> > no option.
> >
> > My original idea was therefore that there might be a construct like a
> > special variable that is set by the parser when a file is being parsed.
> > This
> > variable would then be filled with the URL to that particular file.
> >
> > My question: is there such a construct ? Or can I determine somehow in
> > which
> > file a configuration parameter is set ? Or is there another option ?
> >
> > I hope this clearer ...
> >
> > Thanks,
> > Michiel
> >
> > On 6/8/06, Oliver Heger <oliver.heger@oliver-heger.de> wrote:
> >>
> >> Michiel Kalkman wrote:
> >> > Hi,
> >> >
> >> > I'd like to be able to do the following. I have the following
> directory
> >> > structure:
> >> >
> >> > root/A/config.xml
> >> > root/B/specificConfigForB.xml
> >> > root/B/log4jConfigForB.xml
> >> >
> >> > root/A/config.xml looks like:
> >> > <configuration>
> >> >  <xml fileName="../B/specificConfigForB.xml"/>
> >> > </configuration>
> >> >
> >> > root/B/specificConfigForB.xml refers to the location of log4j like:
> >> > <configuration>
> >> >
> >>
> <log4j-url>${some-predefined-variable-resolved-at-runtime}/log4j.xml</log4j-url>
> >>
> >> >
> >> > </configuration>
> >> >
> >> > The idea is that when I do something like config.getString(
> >> "log4j-url")
> >> I
> >> > want the location of the log4j.xml, like
> >> > root/b/log4j.xml (and not root/a/log4j.xml).
> >> >
> >> > Is something like this possible ?
> >> >
> >> > If so, how ?
> >> >
> >> > Thanks and regards,
> >> > Michiel
> >> >
> >>
> >> Hello,
> >>
> >> I am not sure if I understand your question correctly. Do you want to
> >> know if there is a mechanism of using variables in a configuration file
> >> that can be replaced by current values? Then the answer is yes; have a
> >> look at
> >>
> >>
> http://jakarta.apache.org/commons/configuration/howto_properties.html#Variable%20Interpolation
> >>
> >>
> >> Oliver
> >>
> >> ---------------------------------------------------------------------
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> >>
> >>
> >
>
>
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>

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