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https://issues.apache.org/jira/browse/OAK-2413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14355144#comment-14355144
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Michael Dürig commented on OAK-2413:
------------------------------------

bq. is there an easy way to identify if there are changes?

If you don't need the diff, just use {{equals}}.

Re. a test: just call {{PrivilegeValidator#childNodeChanged}} directly from a 
unit test passing the same node state for {{before}} and {{after}}. 


> Clarify Editor.childNodeChanged()
> ---------------------------------
>
>                 Key: OAK-2413
>                 URL: https://issues.apache.org/jira/browse/OAK-2413
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core
>            Reporter: Marcel Reutegger
>            Assignee: Michael Dürig
>            Priority: Minor
>             Fix For: 1.2
>
>
> The current contract for {{Editor.childNodeChanged()}} does not specify if 
> this method may also be called when the child node did not actually change. 
> The method {{NodeStateDiff.childNodeChanged()}} explicitly states that there 
> may be such calls. Looking at the implementation connecting the two classes, 
> {{EditorDiff.childNodeChange()}} simply calls the editor without checking 
> whether the child node did in fact change.
> I think we either have to change the {{EditorDiff}} or update the contract 
> for the Editor and adjust implementations. E.g. right now, PrivilegeValidator 
> (implements Editor), assumes a call to {{childNodeChange()}} indeed means the 
> child node changed.



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