确定类和属性约束之间的JSR303 bean验证

Question

I am working on a generic plugin which help in validating beans based on JSR303 bean validation. Since it need to be generic, so i can not rely on underlying vendor implementation.

I need to determine type of constraint violation from ConstraintViolation object. one way is to use ConstraintViolation#getPropertyPath() . If getName() returns null on the leaf node you have a class level constraint, otherwise a property level constraint.

One option is like

 Iterator<Node> violationNodes=violation.getPropertyPath().iterator();
    Node leafNode=null;
    while (violationNodes.hasNext()){
        leafNode=violationNodes.next();
    }

    if(leafNode!=null){
    // property constraint
    }
    else{
     // class constraint
    }

Is this good approach to determine or there can be other efficient or good approach to do this?

Answer 1

If you're working with Bean Validation 1.0, relying on Node#getName() would be the way to go (note that it should be leafNode.getName() != null in your if statement).

Bean Validation 1.1 adds a method Node#getKind() which returns an enumeration for the different element kinds, so this would be the preferable way if you work with 1.1 already.