Alec Swan schrieb:
This is really unfortunate. The merged configuration is required to preserve
comments from defaults, but not necessarily overrides.
Are there any plans to add this functionality in the near future?
Thanks.
This is a new feature that was not considered before.
I think, it is not trivial to implement in a really generic way. Your
use case requires that one configuration overrides a default
configuration. For another use case a different merge algorithm may be
required. There are some details to think about.
However, you can open an enhancement request in our bug tracking system
[1]. I don't know if somebody finds the time to work on this feature
soon. But if you really need it, you can try to create a patch yourself.
This is open source ;-)
Oliver
[1] http://commons.apache.org/configuration/issue-tracking.html
On Wed, Jun 17, 2009 at 1:54 PM, Oliver Heger
<oliver.he...@oliver-heger.de>wrote:
Alec Swan schrieb:
I wrote the code following the example on
http://commons.apache.org/configuration/userguide-1.2/howto_compositeconfiguration.html
There is no save() method in CompositeConfiguration. How can I save it?
Thanks.
The merged configuration produced by CompositeConfiguration is only
virtual, i.e. there is no physical PropertiesConfiguration containing the
merged properties. It lives only in memory and cannot be saved.
I am afraid, Commons Configuration does not provide an easy solution for
your problem. You can copy the content of the composite configuration into a
properties configuration, e.g.:
PropertiesConfiguration propConfig = new PropertiesConfiguration();
propConfig.copy(compositeConfig);
propConfig.save(someFile);
But this will copy only the properties and not the comments or the overall
layout.
Oliver
On Wed, Jun 17, 2009 at 11:23 AM, Jörg Schaible <joerg.schai...@gmx.de
wrote:
Alec Swan wrote at Mittwoch, 17. Juni 2009 18:39:
Thank you for updating the subject, Jörg.
I changed the order in which I add defaults and overrides. The following
is the new code:
// merge overrides with defaults
CompositeConfiguration compositeConfig = new
CompositeConfiguration(overridingConfig);
compositeConfig.addConfiguration(defaultConfig);
// convert merged properties to string
StringWriter writer = new StringWriter();
overridingConfig.save(writer);
defaultConfig contains the following properties:
# A property
A = 1
# B property
B = 2
overridingConfig contains the following properties:
B = 3
I expected the merged content written to the writer to contain these
properties:
# A property
A = 1
# B property
B = 3
Instead, the merged content written to the writer is the same as the
overridingConfig:
B = 3
Could anybody tell me what's wrong with my code?
You saved the overridingConfiguration and not the compositeConfig.
- Jörg
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