[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-4417) Add annotation support for UserCollectionType

[Steve Ebersole (JIRA)]

    [ https://hibernate.onjira.com/browse/HHH-4417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=45828#comment-45828 ] 

Steve Ebersole commented on HHH-4417:
-------------------------------------

Even in {{hbm.xml}} binding, it is just assumed that whatever is named as a {{collection-type}} deals with the matching Java type named by the containing {{<list/>}}, {{<set/>}}, etc.  

As far as the corollary to determining difference between {{<list/>}}, {{<set/>}}, etc {{CollectionBinder}} on the annotation side already contains the appropriate logic.  As Endre points out, there is a minor issue WRT the "Commons Annotations" stuff and/or the ReflectionManager where custom collection implementations (not the collection type implementations!) are not recognized as collections, even if the custom collection implementation extends a JDK one.  So you have to expose this as a java collection ATM :(  As an example:
{code:borderStyle=solid}
// given:
class MyCustomList<X> implements java.util.List<X> {
    ...
}

// and:
class MyCustomListType implements UserCollectionType {
    ...
}

// works fine
@OneToMany(...)
@CollectionType( type="MyCustomListType" )
public List getOrders()

// erros due to mentioned limitation
@OneToMany(...)
@CollectionType( type="MyCustomListType" )
public MyCustomList getOrders()
{code}



> Add annotation support for UserCollectionType
> ---------------------------------------------
>
>                 Key: HHH-4417
>                 URL: https://hibernate.onjira.com/browse/HHH-4417
>             Project: Hibernate ORM
>          Issue Type: Patch
>          Components: annotations
>         Environment: All versions, database agnostic
>            Reporter: Douglas Sjoquist
>            Assignee: Steve Ebersole
>            Priority: Minor
>             Fix For: 4.1.1
>
>         Attachments: UserCollectionTypeAnnotation.zip
>
>   Original Estimate: 0.5h
>          Time Spent: 0.45h
>  Remaining Estimate: 0.5h
>
> Add an annotation to specify the UserCollectionType for a OneToMany or ManyToMany.
> The annotation is named CollectionTypeInfo, perhaps better named UserCollectionType, but I didn't know the standards for naming classes.
> The change to AnnotationBinder is minor and is delineated by '//dwsjoquist//'  comment lines.
> Usage:
>     @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
>     @JoinColumn(name = "id")
>     @CollectionTypeInfo(name = "examples.MyUserCollectionType")
>     public List<ExampleAttribute> getExampleAttributes() {

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