Michael Dürig created OAK-1110:
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Summary: Make NodeStateDiff composable
Key: OAK-1110
URL: https://issues.apache.org/jira/browse/OAK-1110
Project: Jackrabbit Oak
Issue Type: Improvement
Components: core
Reporter: Michael Dürig
Currently it is not possible to warp a {{NodeStateDiff}} instance into another
one for delegation. The problem is that recursion is done by the consumer of
the {{childNodeChanged()}} call back which causes wrapped {{NodeStateDiff}} "to
escape". To fix that I propose to separate the concerns of change notification
from recursing into a subtree. For this we need an extra method
{{createChildDiff}} on the {{NodeStateDiff}} interface:
{code}
/**
* Create a {@code NodeStateDiff} for diffing the passed {@code before} and
* {@code after} states. Returning {@code null} skips comparison for the sub
* trees rooted at the passed states.
*
* @param name name of the child node
* @param before before state of the child node
* @param after after state of the child node
* @return {@code NodeStateDiff} for the child node
*/
@CheckForNull
NodeStateDiff createChildDiff(String name, NodeState before, NodeState
after);
{code}
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