[hibernate-issues] [Hibernate-JIRA] Reopened: (HV-389) Support conditional validation at property level

[Hardy Ferentschik (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HV-389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hardy Ferentschik reopened HV-389:
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> Support conditional validation at property level
> ------------------------------------------------
>
>                 Key: HV-389
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HV-389
>             Project: Hibernate Validator
>          Issue Type: New Feature
>          Components: engine
>    Affects Versions: 4.1.0.Final
>            Reporter: jason shi
>
> In Oval, there is a "when" attribute in each ConstrainsChecker,which can be used for conditional check.
> In the following example fieldB must not be null only if fieldA is not null as well. With the prefix groovy: it is indicated that the formula is expressed in the Groovy language. 
> {code}
> public class BusinessObject
> {
>   private String fieldA;
>   @NotNull(when = "groovy:_this.fieldA != null")
>   private String fieldB;
> }
> {code}
> Although we can use ScriptAssert as a work-around, but ScriptAssert can't be used at property level validation, and the "when" attribute make the validation logical more clearly.
> In UI layer validation, this feature is very important in instant UI validation.
> The hibernate validator should have the ability  to pass a ValueContext to the Validator,then we can write a custom Contrains to implement this feature.

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