/**
* Get all the constraints for a single field.
*
* @param string $fieldName
*
* @return Iterable
*/
public function getFieldConstraints($fieldName)
{
$maybeConstraints = $this->annotations->lookupIn([$fieldName, static::ANNOTATION_CONSTRAINTS]);
if ($maybeConstraints->isNothing()) {
return ArrayList::zero();
}
$constraints = Maybe::fromJust($maybeConstraints);
if (is_array($constraints)) {
return ArrayList::of($constraints);
} elseif ($constraints instanceof Iterable) {
return $constraints;
}
return ArrayList::of([$constraints]);
}
public function testZero()
{
$instance = ArrayList::zero();
$this->assertEquals([], $instance->toArray());
}
/**
* Add one or more constraints to a field.
*
* @param string $field
* @param AbstractConstraint|AbstractConstraint[] $constraint
*
* @throws MismatchedArgumentTypesException
* @return $this
*/
public function let($field, $constraint)
{
Arguments::define(Boa::string(), Boa::either(Boa::instance(AbstractConstraint::class), Boa::arrOf(Boa::instance(AbstractConstraint::class))))->check($field, $constraint);
if (!$this->constraints->member($field)) {
$this->constraints = $this->constraints->insert($field, ArrayList::zero());
}
if (!is_array($constraint)) {
$constraint = [$constraint];
}
$this->constraints = $this->constraints->insert($field, Maybe::fromMaybe(ArrayList::zero(), $this->constraints->lookup($field))->append(ArrayList::of($constraint)));
return $this;
}