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https://issues.apache.org/jira/browse/JCR-1543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12592407#action_12592407
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angela commented on JCR-1543:
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adjusted in sandbox/spi: rev. 651630
> Improve reliability of canAddMixin
> ----------------------------------
>
> Key: JCR-1543
> URL: https://issues.apache.org/jira/browse/JCR-1543
> Project: Jackrabbit
> Issue Type: Improvement
> Components: jackrabbit-spi
> Affects Versions: 1.4
> Reporter: Julian Reschke
> Assignee: Julian Reschke
> Priority: Minor
> Fix For: 1.5
>
> Attachments: JCR1543.diff, JCR1543.diff, JCR1543.diff
>
>
> The current implementation of canAddMixin in JCR2SPI lacks flexibility. It
> only consults the (SPI) node type registry, checking for (1) whether the
> mixin exists, and (2) whether it is already present and (3) whether it's
> consistent with the node's type.
> This is fine for stores where any legal mixin can be added anywhere. It
> doesn't work well for stores that are limited in what they can do; for
> instance when nt:file nodes can be made mix:versionable, but nt:folder nodes
> can't.
> Proposal: enhance QNodeTypeDefinition with
> public Name[] getSupportedMixins();
> where the return value is either null (no constraints or no constraints
> known), or a list of mixin types that are supported for this node type.
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