[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=42526#action_42526 ] 

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

Adding Sebastian Thomschke's proposal


{code}
Hi,

I remember we had a discussion whether or not to allow the validation of a map's keys. And at the time being the decision was made to not support this.

In OVal 1.40 I introduced a feature that gives users control on how a constraint should be applied. For example when you have a not-null constraint for a map field your use cases could be, the map's keys may not contain null, none of the map's value may null, or the map itself may not be null. In OVal you can do this:

@NotNull
private Map myMap; // the map and the values may not be null

@NotNull(appliesTo = ConstraintTarget.CONTAINER)
private Map myMap; // the map itself may not be null

@NotNull(appliesTo = ConstraintTarget.VALUES)
private Map myMap; // the values may not be null

@NotNull(appliesTo = ConstraintTarget.KEYS)
private Map myMap; // the keys may not be null

@NotNull(appliesTo = {ConstraintTarget.CONTAINER,ConstraintTarget.KEYS,ConstraintTarget.VALUES})
private Map myMap; // the map itslef, keys and values may not be null

This also works for Lists and Arrays...of course the option Container.KEYS is ignored there.

Any thoughts?

Regards,
Seb
{code}

> 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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