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Date: Thu, 30 Nov 2006 16:43:33 -0500
From: "Mark Diggory" <mdiggory@gmail.com>
To: "Jakarta Commons Users List" <commons-user@jakarta.apache.org>
Subject: Re: [configuration] Variable Interpolation doesn't happen in subset()
 and configurationAt()
In-Reply-To: <456F4A85.60406@oliver-heger.de>
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	 <456F4A85.60406@oliver-heger.de>

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Thanks, this is interesting news, I'll dig deeper into my configuration. And
tray a few other tests. Is there a way to turn interpolation off/on? thanks,
Mark

On 11/30/06, Oliver Heger <oliver.heger@oliver-heger.de> wrote:
>
> Mark Diggory wrote:
> > I'm trying to use variable interpolation in version 1.3 I'm unsure of
> the
> > behavior with Sub-configurations. I'm wondering if interpolation should
> > work
> > in these as well (i.e. using the entire configuration to interpolate
> > against. For instance if I have
> >
> > base.dir=/home/foo
> >
> > test.absolute.dir.x=${base.dir}/mypath
> > test.absolute.dir.y=${base.dir}/mypath1
> > test.absolute.dir.z=${base.dir}/mypath2
> >
> > If I call something like:
> >
> > Configuration config = configuration.configurationAt("test.absolute.dir
> ");
> > for (Iterator iter = config.getKeys(); iter.hasNext();)
> >        {
> >            String key = (String) iter.next();
> >            System.out.println(key + "=" + config.getString(key));
> >        }
> >
> > this prints out
> >
> > x=${base.dir}/mypath
> > y=${base.dir}/mypath1
> > z=${base.dir}/mypath2
> >
> > I was naively expecting
> >
> > x=/home/foo/mypath
> > y=/home/foo/mypath1
> > z=/home/foo/mypath2
> >
> > Thoughts?
> > Mark
> >
>
> Not sure what happens here. Based on your code fragment I added the
> following test case to TestSubnodeConfiguration [1]:
>
>
>      public void testInterpolationFromConfigurationAt()
>      {
>          parent.addProperty("base.dir", "/home/foo");
>          parent.addProperty("test.absolute.dir.dir1", "${base.dir
> }/path1");
>          parent.addProperty("test.absolute.dir.dir2", "${base.dir
> }/path2");
>          parent.addProperty("test.absolute.dir.dir3", "${base.dir
> }/path3");
>
>          Configuration sub = parent.configurationAt("test.absolute.dir");
>          for(int i = 1; i < 4; i++)
>          {
>              assertEquals("Wrong interpolation in parent",
> "/home/foo/path" + i, parent.getString("test.absolute.dir.dir" + i));
>              assertEquals("Wrong interpolation in subnode",
> "/home/foo/path" + i, sub.getString("dir" + i));
>          }
>      }
>
> and it works. SubnodeConfiguration overloads the interpolate() method
> and calls interpolate() on its parent. So the whole key should be
> evaluated.
>
> Don't know why you get different results. Do you use special expression
> engines or something like that?
>
> Oliver
>
> [1]
>
> http://svn.apache.org/repos/asf/jakarta/commons/proper/configuration/trunk/src/test/org/apache/commons/configuration/TestSubnodeConfiguration.java
>
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