Hibernate validation: validate PI

Question

I'm in need to apply a validation on a double value which needs to match with PI. I'm thinking to use a @Pattern(regex="3.14159265359"). Is it the best way I can apply such a constraint using Hibernate Validation Constraints? Thanks

This regex will match "3A14159265359", since . has special meaning (any character), so it's probably not the right choice. Why do you need to have this on your object/validate it anyway? PI is a constant, it can't be changed, so I don't really see a use case where having it as some mutable field which you're going to validate would be of any use. — Bohuslav Burghardt
– Bohuslav Burghardt, Commented Oct 22, 2015 at 10:47

Hardy · Accepted Answer · 2015-10-22 15:02:07Z

1

@Pattern is only defined for string type (CharSequence really). If your data type is a double you cannot use it, unless you write a custom ConstraintValidator. You could use DecimalMin in combination with DecimalMax potentially allowing for some imprecision. Alternatively, you could write your own constraint @Pi which for example allows to specify a delta. @Pi is probably the best solution, provided you really need this validation.

answered Oct 22, 2015 at 15:02

Hardy

19.2k3 gold badges52 silver badges65 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Hibernate validation: validate PI

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related