Jukka Zitting created OAK-171:
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Summary: Add NodeState.compareAgainstBaseState()
Key: OAK-171
URL: https://issues.apache.org/jira/browse/OAK-171
Project: Jackrabbit Oak
Issue Type: Improvement
Components: core
Reporter: Jukka Zitting
Priority: Minor
The {{NodeStore.compare()}} method provides a common mechanism for comparing
any two node states, and we originally decided to put the method on the
{{NodeStore}} interface instead of on {{NodeState}} as for performance reasons
we may want to dispatch the actual diffing operation based on the
implementation of either one of the given {{NodeState}} instances.
In practice it turns out that there's an important special case of this
operation, comparing a {{NodeState}} against an earlier version of it (i.e. a
base state), that is easy to dispatch based on just the modified state and is
used so often that keeping the separate {{NodeStore}} reference around for the
comparison operation tends to unnecessarily complicate relevant code.
Thus I'd like to introduce a {{NodeState.compareAgainstBaseState()}} method
signature in {{oak-core}} for this specific case. We'd still keep the
{{NodeStore.compare()}} method around for more complicated diffing cases.
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