RulesDefaultEventHandler.php

<?php

namespace Drupal\rules\Core;

use Drupal\Component\Plugin\Exception\ContextException;
use Drupal\Core\Plugin\PluginBase;

/**
 * Default event handler class.
 */
class RulesDefaultEventHandler extends PluginBase implements RulesEventHandlerInterface {
    
    /**
     * {@inheritdoc}
     */
    public function getContextDefinitions() {
        $definition = $this->getPluginDefinition();
        if ($this instanceof RulesConfigurableEventHandlerInterface) {
            $this->refineContextDefinitions();
        }
        return !empty($definition['context_definitions']) ? $definition['context_definitions'] : [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getContextDefinition($name) {
        $definitions = $this->getContextDefinitions();
        if (empty($definitions[$name])) {
            throw new ContextException(sprintf("The context '%s' is not a valid context.", $name));
        }
        return $definitions[$name];
    }

}