public function DataIsEmpty::evaluate in Rules 8.3

Evaluates the condition and returns TRUE or FALSE accordingly.

Return value

bool TRUE if the condition has been met, FALSE otherwise.

Overrides RulesConditionBase::evaluate

File

src/Plugin/Condition/DataIsEmpty.php, line 35

Class

DataIsEmpty

Provides a 'Data value is empty' condition.

Namespace

Drupal\rules\Plugin\Condition

Code

public function evaluate() {
  $data = $this
    ->getContext('data')
    ->getContextData();
  if ($data instanceof ComplexDataInterface || $data instanceof ListInterface) {
    return $data
      ->isEmpty();
  }
  $value = $data
    ->getValue();

  // For some primitives we can rely on PHP's type casting to boolean.
  if ($data instanceof StringInterface || $data instanceof IntegerInterface || $data instanceof BooleanInterface) {
    return !isset($value) || !$value;
  }
  return !isset($value);
}