[hibernate-issues] [Hibernate-JIRA] Commented: (BVAL-202) Apply constraints on the elements of an iterator

[Emmanuel Bernard (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/BVAL-202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=35832#action_35832 ] 

Emmanuel Bernard commented on BVAL-202:
---------------------------------------

Solution #4
add a new OnElements subannotation. This annotation should contain all the attribute of its mother constraint annotation. .List should probably contains this annotation too.

@NotNull
@Size(max=30)
@Size.OnElements(max=50)
@Email.OnElements
Collection<String> emails;

where
public @interface Size {
  String message() default {...};
  int min default 0;
  ...
  @interface OnElements {
    String message() default {...};
    int min default 0;
  }
  @interface List {
    Size[] value();
    @interface OnElements {
      Size[] value();
    }
  }

advanced example
@Size.List.OnElements( {
  @Size(max=30),
  @Size(max=40, groups=Admin.class)
})

The drawback of this method is that:
 - it requires to change existing applications
 - it make creating a constraint pretty complex

> Apply constraints on the elements of an iterator
> ------------------------------------------------
>
>                 Key: BVAL-202
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/BVAL-202
>             Project: Bean Validation
>          Issue Type: New Feature
>          Components: spec-general
>            Reporter: Emmanuel Bernard
>            Assignee: Hardy Ferentschik
>
> The use case is the ability to ask a constraint to be applied, not on the annotated element itself but on the elements contained by the annotated element (typically an Iterator). Hardy and I have been discussing various options. I will list them in various comments

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