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From Alec Swan <alecs...@gmail.com>
Subject Re: [configuration] Merging overrides with defaults
Date Wed, 17 Jun 2009 20:15:55 GMT
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.

On Wed, Jun 17, 2009 at 1:54 PM, Oliver Heger
<oliver.heger@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.schaible@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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>>>
>>
>
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