# Check a JsonObject
# ~~~
# var validator = new ObjectValidator
# validator.add new RequiredField("id", required = true)
# validator.add new StringField("login", min_size=4)
# validator.add new IntField("age", min=0, max=100)
# assert not validator.validate("""{}""")
# assert not validator.validate("""[]""")
# assert validator.validate("""{ "id": "", "login": "Alex", "age": 10 }""")
# ~~~
class ObjectValidator
	super DocumentValidator

	# Validators to apply on the object
	var validators = new Array[FieldValidator]

	redef fun validate(document) do
		super
		var json = document.parse_json
		if json == null then
			validation.add_error("document", "Expected JsonObject got `null`")
			return false
		end
		return validate_json(json)
	end

	# Validate a Serializable input
	fun validate_json(json: Serializable): Bool do
		if not json isa JsonObject then
			validation.add_error("document", "Expected JsonObject got `{json.class_name}`")
			return false
		end
		validation.object = json
		for validator in validators do
			var res = validator.validate_field(self, json)
			if not res then return false
		end
		return true
	end

	# Add a validator
	fun add(validator: FieldValidator) do validators.add validator
end