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https://issues.apache.org/jira/browse/JDO-751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15367840#comment-15367840
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Craig L Russell edited comment on JDO-751 at 7/8/16 4:38 PM:
-------------------------------------------------------------
Starting to work on the specification:
Persistent Object Model 6.4.3
java.lang.Optional
JDO implementations must support fields of type Optional<T> where T is an
Immutable Object Class types, java.util.Date, Enum types, or
Persistence-capable Class types. They may be mapped nullable datastore types or
to Optional<T> types at the option of the JDO implementation.
When instantiating an instance from the datastore, the JDO implementation would
get the value v from the datastore and assign the field f =
Optional<T>.ofNullable(v). When storing the field in the datastore, the
persistence implementation would store the result of v =
f.isPresent()?f.get():null.
was (Author: clr):
Starting to work on the specification:
Persistent Object Model 6.4.3
java.lang.Optional
JDO implementations must support fields of type Optional<T> where T is any
supported Object type. They may be mapped to nullable datastore types or to
Optional<T> types at the option of the JDO implementation.
When instantiating an instance from the datastore, the JDO implementation would
get the value v from the datastore and assign the field f =
Optional<T>.ofNullable(v). When storing the field in the datastore, the
persistence implementation would store the result of v =
f.isPresent()?f.get():null.
> Support for Java8 Optional
> --------------------------
>
> Key: JDO-751
> URL: https://issues.apache.org/jira/browse/JDO-751
> Project: JDO
> Issue Type: New Feature
> Components: specification, tck
> Reporter: Andy Jefferson
> Fix For: JDO 3.2
>
> Attachments: JDO-751-tck-patch-v5.txt
>
>
> java.util.Optional provides a feature that is available in other languages.
> Since JDO 3.2 will be for Java8+ then it makes sense to add support for this
> as a "supported persistable type"
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