Alec Swan schrieb:
Thanks, this approach worked.
One minor problem I ran into was that the merged configuration always has a
new line at the end even if the default configuration does not have a new
line at the end of the file. Is there a way to control if the new line
should be added or not?
Thanks.
The PropertiesConfigurationLayout class allows you to configure the
number of empty lines to be output before a property, but after a
property always a line separator is written.
Since the last release there was some work of making the output of
PropertiesConfiguration more customizable ([1]). However, I am not sure
whether this gives you enough control for your purpose. And this code
has not yet been released.
Oliver
[1] http://issues.apache.org/jira/browse/CONFIGURATION-370
On Wed, Jun 17, 2009 at 2:38 PM, Oliver Heger
<oliver.he...@oliver-heger.de>wrote:
Alec Swan schrieb:
Can the following be done with Commons Configurations?
1. Load defaults into a PropertyConfiguration object.
2. Load overrides into a Java Properties object. (Note that I do not need
to
preserve the formatting of overrides.)
3. Iterate over the overrides properties and set values on corresponding
default properties by calling PropertyConfiguration.setXXX methods.
4. Save the resulting PropertyConfiguration object.
How can I make sure that the resulting PropertyConfiguration object
preserves comments from the original defaults?
Thanks.
Alec
From looking at the code I assume that setting the value of a property
removes the old comment, but I did not test this.
To avoid this, you can work with the PropertiesConfigurationLayout object
directly that is associated with the PropertiesConfiguration. This could
look something like the following:
PropertiesConfiguration config =
new PropertiesConfiguration(defaultsFile);
PropertiesConfigurationLayout layout = config.getLayout();
Now iterate over the properties in the overrides config and for each key k
do the following:
String comment = layout.getComment(k);
config.setProperty(k, <new value from override config>);
layout.setComment(k, comment);
I think, this should work.
Oliver
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
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org
For additional commands, e-mail: dev-h...@commons.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org
For additional commands, e-mail: dev-h...@commons.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org
For additional commands, e-mail: dev-h...@commons.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org
For additional commands, e-mail: dev-h...@commons.apache.org
