AndExpression.php

<?php

namespace Drupal\rules\Plugin\RulesExpression;

use Drupal\rules\Context\ExecutionStateInterface;
use Drupal\rules\Engine\ConditionExpressionContainer;

/**
 * Evaluates a group of conditions with a logical AND.
 *
 * @RulesExpression(
 *   id = "rules_and",
 *   label = @Translation("Condition set (AND)"),
 *   form_class = "\Drupal\rules\Form\Expression\ConditionContainerForm"
 * )
 */
class AndExpression extends ConditionExpressionContainer {
    
    /**
     * Returns whether there is a configured condition.
     *
     * @todo Remove this once we added the API to access configured conditions.
     *
     * @return bool
     *   TRUE if there are no conditions, FALSE otherwise.
     */
    public function isEmpty() {
        return empty($this->conditions);
    }
    
    /**
     * {@inheritdoc}
     */
    public function evaluate(ExecutionStateInterface $state) {
        // Use the iterator to ensure the conditions are sorted.
        foreach ($this as $condition) {
            
            /** @var \Drupal\rules\Engine\ExpressionInterface $condition */
            if (!$condition->executeWithState($state)) {
                $this->rulesDebugLogger
                    ->info('%label evaluated to %result.', [
                    '%label' => $this->getLabel(),
                    '%result' => 'FALSE',
                ]);
                return FALSE;
            }
        }
        $this->rulesDebugLogger
            ->info('%label evaluated to %result.', [
            '%label' => $this->getLabel(),
            '%result' => 'TRUE',
        ]);
        // An empty AND should return FALSE. Otherwise, if all conditions evaluate
        // to TRUE we return TRUE.
        return !empty($this->conditions);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function allowsMetadataAssertions() {
        // If the AND is not negated, all child-expressions must be executed - thus
        // assertions can be added it.
        return !$this->isNegated();
    }

}