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From "Julian Reschke (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-1543) Improve reliability of canAddMixin
Date Thu, 17 Apr 2008 13:43:21 GMT
Improve reliability of canAddMixin
----------------------------------

                 Key: JCR-1543
                 URL: https://issues.apache.org/jira/browse/JCR-1543
             Project: Jackrabbit
          Issue Type: Improvement
          Components: jackrabbit-spi
            Reporter: Julian Reschke
            Assignee: Julian Reschke
            Priority: Minor


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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