Question: Validating indivddual values in a map based on key

jpeng · **Joined:** Thu Oct 01, 2015 12:07 pm **Posts:** 2

I have map with key being of String type and value of Object type (Map<String, Object>). I want to be able to validate the value of the object given based on what key is provided. For example:

If I have a map:

{ "foo" : Object}

I need the value of a key foo in this map to be of Integer type. Can I do this using hibernate validator? if so how would I be able to do this?

Gunnar · **Joined:** Sat Jan 24, 2009 12:46 pm **Posts:** 388

Hi, you could implement a custom constraint for that (see http://docs.jboss.org/hibernate/validator/5.2/reference/en-US/html_single/#validator-customconstraints). E.g. something like that:

Code:

@MapValueTypes({
    @ValueType(key="foo", type=Integer.class),
    @ValueType(key="bar", type=Long.class)
})
private Map<String, Object> myMap;

But if your code relies on specific map values and their type, chances are you are better off with a dedicated class modeling that structure rather than using a map.

--Gunnar