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From "Oliver Heger (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CONFIGURATION-342) DatabaseConfiguration.copy() loses list/array values
Date Sun, 26 Oct 2008 10:34:44 GMT

    [ https://issues.apache.org/jira/browse/CONFIGURATION-342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12642786#action_12642786
] 

Oliver Heger commented on CONFIGURATION-342:
--------------------------------------------

Yes, I am interested in this stuff and am happy to review and apply patches.

I think, adding support for multi-valued properties should not be too complicated. But making
DatabaseConfiguration truly hierarchical will be challenging; we would have to implement all
the enhanced query facilities.

To your question about traversing hierarchical node structures: There is indeed a visitor-like
approach implemented in the nodes of a hierarchical configuration. You can for instance check
out the HierarchicalConfiguration.getKeys() method, which uses a visitor to gather a list
of the existing keys. This should be similar to what is needed for DatabaseConfiguration.

> DatabaseConfiguration.copy() loses list/array values
> ----------------------------------------------------
>
>                 Key: CONFIGURATION-342
>                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-342
>             Project: Commons Configuration
>          Issue Type: Bug
>          Components: Type conversion
>    Affects Versions: 1.5
>            Reporter: Scott Wells
>         Attachments: ConfigurationUtil.java
>
>
> I've found a bug where adding a list property to a BaseConfiguration, then copying that
full BaseConfiguration to a DatabaseConfiguration, the list is lost and only the first element
is copied to the destination DatabaseConfiguration.  For example:
> BaseConfiguration bc = new BaseConfiguration();
> bc.addProperty("myList", Arrays.asList("1", "2", "3", "4");
> DatabaseConfiguration dc = new DatabaseConfiguration(...);
> dc.copy(bc);
> List list = dc.getList("myList");
> // At this point, you'll get a single element list containing only "1"

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