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From "Erik Hatcher" <jakarta-...@ehatchersolutions.com>
Subject Re: custom properties loading task
Date Sun, 18 Nov 2001 05:08:10 GMT
Its not really hackish to define a property even knowing that its likely to
be overridden from the command-line - thats just the "Ant-way".

    Erik


----- Original Message -----
From: "jeff drost" <jeffdrost@yahoo.com>
To: "Ant Developers List" <ant-dev@jakarta.apache.org>
Sent: Friday, November 16, 2001 12:58 PM
Subject: Re: custom properties loading task


> What if no command line argument is supplied?  I don't plan on providing
an
> actual file called "${buildconfig}.buildconfig", as ant would expect if
the
> ${buildconfig} property was not defined.
>
> I imaging I could set ${buildconfig} to "default" on a previous line, but
that
> is fairly hackish.. it would load the file "default.buildconfig" twice
(the
> second time having no effect).
>
> Jeff
>
>
> --- Erik Hatcher <jakarta-ant@ehatchersolutions.com> wrote:
> > This would do about the same thing:
> >
> >     <property file="${buildconfig}.buildconfig"/>
> >     <property file="default.buildconfig"/>
> >
> > No guarantee about one being a subset of the other though, nor would
> > exceptions be thrown.
> >
> >     Erik
> >
> >
> >
> > ----- Original Message -----
> > From: "jeff drost" <jeffdrost@yahoo.com>
> > To: <ant-dev@jakarta.apache.org>
> > Sent: Friday, November 16, 2001 9:16 AM
> > Subject: custom properties loading task
> >
> >
> > > I have written a custom task, and have a hunch that the same
functionality
> > > could be achieved with several built-in tasks.  I'm hoping to find
out, so
> > I
> > > can either use the built-in approach, or contribute my task.
> > >
> > > Rather than trying to explain it, I will give an example of how I use
this
> > > task.  In the directory I run builds from, I have four property files,
> > they
> > > are:
> > >
> > > default.buildconfig
> > > qa.buildconfig
> > > stage.buildconfig
> > > prod.buildconfig
> > >
> > > If I simply run "ant", the task (which is currently called
buildconfig)
> > loads
> > > the default.buildconfig property file and copies the loaded properties
> > into the
> > > Project.  These properties are then used by the build process.
> > >
> > > If I run "ant -Dbuildconfig=qa" then the default.buildconfig property
file
> > is
> > > loaded, then the qa.buildconfig file is loaded.  The properties loaded
> > from qa
> > > overwrite those in the default properties file.  The resulting
properties
> > are
> > > then copied into the Project.  Not that if a property is defined in qa
> > that is
> > > not defined in default, an exception is thrown.
> > >
> > > I know that without this task, I could load the smaller subset of
> > properties
> > > first, and then load the larger superset next, but this doesn't really
> > > guarantee that the first one is a subset.  Also, I am not familiar
with
> > how I
> > > would go about loading the first property file based on a command line
> > > argument.  Any thoughts?
> > >
> > >
> > > Thanks,
> > > Jeff Drost
> > >
> > >
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> >
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>
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