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nomulus/core
Lai Jiang 2f2e9dd49f Add methods to return subtypes of HistoryEntry when querying (#1172)
This is useful when we expect a specific subtype in the return value so
that we can set the parent resource (e. g. DomainContent for
DomainHistory) on it, or when a specific subtype is needed from the call
site.

This PR also fixes some use of generic return values. It is always better to
return <HistoryEntry> than a wildcard <? extends HistoryEntry>, because for
immutable collections, <? extends HistoryEntry> is no different than
<HistoryEntry> as return value -- you can only get a HistoryEntry from it.
The wildcard return value means that even if you are indeed getting a
<DomainHistory> from the query, the call site has no compile time knowledge of
it and can only assume it is a <HistoryEntry>.

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2021-05-24 11:36:11 -04:00
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