[hibernate-issues] [Hibernate-JIRA] Commented: (HV-390) Boolean composition of constraints

[Hardy Ferentschik (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HV-390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=38805#action_38805 ] 

Hardy Ferentschik commented on HV-390:
--------------------------------------

We could enforce {{@ReportAsSingleViolation}} where it is hard to define a meaningful default message like in {{ALL_FALSE}}. I am not sure how usable a tree structure of violations would be.

> Boolean composition of constraints
> ----------------------------------
>
>                 Key: HV-390
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HV-390
>             Project: Hibernate Validator
>          Issue Type: New Feature
>          Components: engine
>            Reporter: Federico Mancini
>            Assignee: Hardy Ferentschik
>             Fix For: 4.2.0
>
>         Attachments: modified classes.zip
>
>
> By adding a built-in annotation @Bool (or some other name) with element values OR, ALLFALSE and AND (which would be the default) it would be possible to 
> compose constraints in a boolean fashion.
> For example:
> {code}
> //Specify that at least one of the patterns must match
> @Bool(OR)
> @List({@Pattern(regexp="pat1"), at Pattern(regexp="pat2"), at Pattern(regexp="pat3"), at Pattern(regexp="pat4")})
> @interface WhiteList{..}
> {code}
> {code}
> //Specify that none of the patterns must match
> @Bool(ALLFALSE)
> @List({@Pattern(regexp="pat1"), at Pattern(regexp="pat2"), at Pattern(regexp="pat3"), at Pattern(regexp="pat4")})
> @interface BlackList{..}
> {code}
> {code}
> //At least on valid contact method must match
> @Bool(OR)
> @Email
> @Address
> @Phone
> @interface ContactDetails{...}
> {code}
> This would greatly increase the type of new constraints that can be defined just by reusing some existing ones.
> Possible extensions might be for example further operators like XOR (meaning exactly one of the constraints must hold) or similar.
> It seems like it is possible to implement this feature by adding very little code to just a couple of classes, and adding the new @Bool annotation to the API.

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