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public function ImmutableInvalidationBase::getExpression in Purge 8.3

Get the invalidation expression.

Return value

mixed|null Mixed expression (or NULL) that describes what needs to be invalidated.

Overrides ImmutableInvalidationInterface::getExpression

1 method overrides ImmutableInvalidationBase::getExpression()
ImmutableInvalidation::getExpression in src/Plugin/Purge/Invalidation/ImmutableInvalidation.php
Get the invalidation expression.

File

src/Plugin/Purge/Invalidation/ImmutableInvalidationBase.php, line 83

Class

ImmutableInvalidationBase
Provides base implementations the immutable invalidation object.

Namespace

Drupal\purge\Plugin\Purge\Invalidation

Code

public function getExpression() {
  return $this->expression;
}