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Message-ID: <4A3949DA.9030308@oliver-heger.de>
Date: Wed, 17 Jun 2009 21:54:02 +0200
From: Oliver Heger <oliver.heger@oliver-heger.de>
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To: Commons Developers List <dev@commons.apache.org>
Subject: Re: [configuration] Merging overrides with defaults
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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, J�rg Schaible <joerg.schaible@gmx.de>wrote:
> 
>> Alec Swan wrote at Mittwoch, 17. Juni 2009 18:39:
>>
>>> Thank you for updating the subject, J�rg.
>>>
>>> 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.
>>
>> - J�rg
>>
>>
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> 


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