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From "Oliver Heger (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CONFIGURATION-559) Support setting default values for configurations
Date Sun, 17 Nov 2013 17:13:20 GMT
Oliver Heger created CONFIGURATION-559:
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             Summary: Support setting default values for configurations
                 Key: CONFIGURATION-559
                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-559
             Project: Commons Configuration
          Issue Type: New Feature
    Affects Versions: 1.9
            Reporter: Oliver Heger
             Fix For: 2.0


In version 1.x it was possible to set a few default values for the properties of configuration
instances (e.g. the list delimiter or the expression engine for XML configurations). These
settings were used if they were not overridden for a specific configuration instance. This
mechanism was mainly based on static fields which is unflexible and thread-hostile.

In the new design, configuration builders are used to create configuration objects. Parameter
objects can be passed to the builder allowing a fine-grained configuration of the instances
to be created. Because there are many settings it would be helpful if there was a way to define
certain default values. An application creating multiple configuration instances with the
same settings could define the used defaults once and then reuse them.

Default settings should be possible for all parameters object supported by the different builder
implementations. No static fields should be used to avoid the drawbacks of the current design.




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