public function TagInvalidation::validateExpression in Purge 8.3

Validate the expression given to the invalidation during instantiation.

Throws

\Drupal\purge\Plugin\Purge\Invalidation\Exception\MissingExpressionException Thrown when plugin defined expression_required = TRUE and when it is instantiated without expression (NULL).

\Drupal\purge\Plugin\Purge\Invalidation\Exception\InvalidExpressionException Exception thrown when plugin got instantiated with an expression that is not deemed valid for the type of invalidation.

Overrides InvalidationBase::validateExpression

See also

\Drupal\purge\Annotation\PurgeInvalidation::$expression_required

\Drupal\purge\Annotation\PurgeInvalidation::$expression_can_be_empty

File

src/Plugin/Purge/Invalidation/TagInvalidation.php, line 25

Class

TagInvalidation

Describes invalidation by Drupal cache tag, e.g.: 'user:1', 'menu:footer'.

Namespace

Drupal\purge\Plugin\Purge\Invalidation

Code

public function validateExpression() {
  parent::validateExpression();
  if (strpos($this->expression, '*') !== FALSE) {
    throw new InvalidExpressionException('Tag invalidations cannot contain asterisks.');
  }
}