[
https://issues.apache.org/jira/browse/CONFIGURATION-508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13463160#comment-13463160
]
Oliver Heger commented on CONFIGURATION-508:
--------------------------------------------
We already have similar functionality in {{DataConfiguration}} which can be
used as a wrapper around a standard {{Configuration}} object providing enhanced
access methods. The methods even try to do some simple data type conversions.
However, the whole concept could certainly be extended by a customizable
converter framework. Please have a look whether these methods fit your needs.
I like your detailed description of the process for creating an object of a
given target class. If this is a standard algorithm for creating an instance of
class A based on string input (or maybe even on an arbitrary type B), maybe it
is a candidate for being included into Commons Lang, for instance in
{{ObjectUtils}}?
> Add generic get method to convert config property to any object
> ---------------------------------------------------------------
>
> Key: CONFIGURATION-508
> URL: https://issues.apache.org/jira/browse/CONFIGURATION-508
> Project: Commons Configuration
> Issue Type: Improvement
> Components: Type conversion
> Affects Versions: 1.9
> Reporter: Matt Bertolini
> Labels: configuration, constructor, conversion, convert,
> generic, property, static, type, valueof
>
> Now that commons configuration requires java 5.0+, I think we should consider
> adding a couple of new generic getter methods that will enable developers to
> automatically convert the configuration property to the object of their
> choice. I envision the API looking like the below:
> {code:java}
> public <T> T get(String key, Class<T> clazz);
> public <T> T get(String key, Class<T> clazz, T defaultValue);
> {code}
> The method would perform a five step process:
> # First it would get the string value, post interpolation.
> # Then it would check the given class for the existence of a static "valueOf"
> method with one String argument. If found, it would invoke that method with
> the interpolated string value.
> # If no static "valueOf" method is found, it would search for a constructor
> with one String argument. If that is found, it would construct a new instance
> of the class passing the interpolated string value.
> # If no constructor or static method is found, it will check if a default
> value was given, returning it if true.
> # Finally, if no default value is given, it checks to see if
> throwExceptionOnMissing is set to true. If so, it will throw the exception.
> If false, it will return null.
> This behavior is similar to how the Spring conversion service works. I
> believe that this feature would be a great help to developers as many of the
> values contained in configuration properties often times map over to various
> model objects.
> I am looking for some feedback on the idea. Let me know your thoughts. Thanks.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
