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Posted to dev@commons.apache.org by "Dennis Kuehn (JIRA)" <ji...@apache.org> on 2007/01/11 17:18:27 UTC
[jira] Updated: (CONFIGURATION-248) Safeguard config source
abstraction by using HierarchicalConfiguration as supertype for all configs
[ https://issues.apache.org/jira/browse/CONFIGURATION-248?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dennis Kuehn updated CONFIGURATION-248:
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Description:
I hope I get this right:
When I have a CompositeConfiguration, the nice thing about it is that I don't have to care in which file or file type a config entry has been defined. Now when part of my CompositeConfiguration has a hierarchical structure and I need the API provided by HierarchicalConfiguration, I lose the aforementioned abstraction: I need to cast a specific part of my CompositeConfiguration to HierarchicalConfiguration. This is a major design problem!
It would be better to leverage the Composite Pattern here: derive all configuration classes from HierarchicalConfiguration. Put differently, move the HierarchicalConfiguration API to Configuration. Even if a config is not hierarchically structured, methods for hierarchical access will be present, but that's a minor drawback which is intrinsic to the Composite Pattern. This also happens when you are modelling a tree structure and you have a common supertype "Node" which has a method "getSubNodes()" which will also be present in leaf node instances (in this case, "getSubNodes()" would return null etc.).
was:
I hope I get this right:
When I have a CompositeConfiguration, the nice thing about it is that I don't have to care in which file or file type a config entry has been defined. Now when part of my CompositeConfiguration has a hierarchical structure and I need the API provided by HierarchicalConfiguration, I lose the aforementioned abstraction: I need to cast a specific part of my CompositeConfiguration to HierarchicalConfiguration. This is a major design problem!
It would be better to leverage the Composite Pattern here: derive all configuration objects from HierarchicalConfiguration. Put differently, move the HierarchicalConfiguration API to Configuration. Even if a config is not hierarchically structured, methods for hierarchical access will be present, but that's a minor drawback which is intrinsic to the Composite Pattern, like when you are modelling a tree structure and you have a common superclass "Node" which has a method "getSubNodes()" which will also be present for leaf nodes (in this case, "getSubNodes()" would return null etc.).
> Safeguard config source abstraction by using HierarchicalConfiguration as supertype for all configs
> ---------------------------------------------------------------------------------------------------
>
> Key: CONFIGURATION-248
> URL: https://issues.apache.org/jira/browse/CONFIGURATION-248
> Project: Commons Configuration
> Issue Type: Wish
> Affects Versions: 1.3 Final
> Environment: -
> Reporter: Dennis Kuehn
>
> I hope I get this right:
> When I have a CompositeConfiguration, the nice thing about it is that I don't have to care in which file or file type a config entry has been defined. Now when part of my CompositeConfiguration has a hierarchical structure and I need the API provided by HierarchicalConfiguration, I lose the aforementioned abstraction: I need to cast a specific part of my CompositeConfiguration to HierarchicalConfiguration. This is a major design problem!
> It would be better to leverage the Composite Pattern here: derive all configuration classes from HierarchicalConfiguration. Put differently, move the HierarchicalConfiguration API to Configuration. Even if a config is not hierarchically structured, methods for hierarchical access will be present, but that's a minor drawback which is intrinsic to the Composite Pattern. This also happens when you are modelling a tree structure and you have a common supertype "Node" which has a method "getSubNodes()" which will also be present in leaf node instances (in this case, "getSubNodes()" would return null etc.).
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