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https://issues.apache.org/jira/browse/OAK-781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13669228#comment-13669228
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Michael Dürig commented on OAK-781:
-----------------------------------
Revision 1487474 addresses the instanceof checking issue by making state
transitions between the connectedness states more explicit: {{Head}} now has a
{{update()}} method, which updates the {{head}} field of the associated builder
to point to the correct {{Head}} instance.
> Clarify / fix effects of MISSING_NODE as base state of NodeBuilder
> ------------------------------------------------------------------
>
> Key: OAK-781
> URL: https://issues.apache.org/jira/browse/OAK-781
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: core
> Reporter: Michael Dürig
> Attachments:
> 0001-OAK-781-Clarify-fix-effects-of-MISSING_NODE-as-base-.patch,
> memorynodebuilder-1.png, memorynodebuilder-2.png, OAK-781-2.patch,
> OAK-781.patch, OAK-781_reset.patch
>
>
> Having a {{MISSING_NODE}} respectively a node state that returns false for
> its {{exists}} method as a base state of a node builder results in undefined
> behaviour. We need to clarify how to handle such cases for resolving OAK-766.
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