Support update-aware sub-configurations for the configurationsAt() method
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Key: CONFIGURATION-333
URL: https://issues.apache.org/jira/browse/CONFIGURATION-333
Project: Commons Configuration
Issue Type: New Feature
Affects Versions: 1.5
Reporter: Oliver Heger
Assignee: Oliver Heger
Priority: Minor
Fix For: 2.0
The configurationAt() method of hierarchical configurations has a
supportsUpdates parameter. If set to true, the sub-configuration returned is
aware of updates of its parent configuration. The configurationsAt() method
should support a similar mechanism, too.
Checking for updates of the parent configuration requires the sub-configuration
to be constructed with a unique key. So far it was not possible to determine
such a key in the configurationsAt() method because the key passed to this
method can select multiple nodes. So a way has to be implemented to determine a
unique key for a given configuration node.
Having unique keys for all properties defined could be useful for other use
cases, too. Maybe an extended version of the getKeys() method makes sense that
returns unique keys? So each key returned by this method is guaranteed to map
to exactly one node.
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