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

[Federico Mancini (JIRA)]

Boolean composition of constraints
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                 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


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:



//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{..}

//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{..}

//At least on valid contact method must match
@Bool(OR)
@Email
@Address
@Phone
@interface ContactDetails{...}

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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