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

[jason shi (JIRA)]

Support conditional validation at property level
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                 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
            Assignee: Hardy Ferentschik


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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