[hibernate-dev] 6.0 proposal - CollectionTuplizer

[Steve Ebersole]

Sorry, I have no idea how that is related to this subject.  Maybe I am
missing something?


On Fri, Jun 16, 2017 at 9:45 AM Jordan Gigov <coladict at gmail.com> wrote:

> Would this allow for queries of multiple keys, like this?
>
> SELECT * FROM tbl WHERE (key1, key2) IN ( (val1k1,val1k2),
> (val2k1,val2k2)... )
>
> I started working on trying to fit something like this in 5.2 and see
> what problems I would encounter, but haven't had time to finish it.
>
> On 16 June 2017 at 17:14, Steve Ebersole <steve at hibernate.org> wrote:
> > No feedback, so I will work in this direction then...
> >
> > On Thu, May 18, 2017 at 10:23 AM Steve Ebersole <steve at hibernate.org>
> wrote:
> >
> >> As part of removing most Type sub-types we are left with the question of
> >> how to handle the role served by CollectionType.  Andrea and I came up
> with
> >> a proposal that not only serves that purpose but also allows a level of
> >> customization we have so far not supported but which has been asked for
> a
> >> few times (mostly as part of framework/language integration into
> Hibernate;
> >> Ceylon, etc).
> >>
> >> Here is the proposal:
> >>
> >>    /**
> >>     * Encapsulates collection type specific behavior/information
> >>     * <p/>
> >>     * NOTE : the name "tuplizer" was chosen as this really serves
> >>     * same logical purpose as the entity and component tuplizers
> >>     * do entities and components respectively.
> >>     */
> >>    interface CollectionTuplizer<C> {
> >>       /**
> >>        * Access to the type of the collection.  This
> >>        * is expected to be an interface.  Used to create
> >>        * a registry against which we can resolve the
> >>        * reflected attribute type.  E.g. an attribute
> >>        * defined as `List` would be resolved to the
> >>        * CollectionTuplizer that deals with lists
> >>        */
> >>       Class<C> getCollectionJavaType();
> >>
> >>       /**
> >>        * Create an empty instance of the collection wrapper
> >>        */
> >>       PersistentCollection<C> create(int anticipatedSize);
> >>
> >>       /**
> >>        * Wrap an existing "raw" view of the collection
> >>        */
> >>       PersistentCollection<C> wrap(Object rawCollection);
> >>
> >>       /**
> >>        * Creates the representation of this plural attribute
> >>        * according to the runtime domain model view.
> >>        */
> >>       <O> PluralPersistentAttribute<O,C,?> generatePluralAttribute();
> >>
> >>       // anytihng else?  element comparator, etc?
> >>    }
> >>
> >> Thoughts?  Suggestions?
> >>
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