TypedDataLanguageRelationshipDeriver.php

<?php

namespace Drupal\ctools\Plugin\Deriver;

use Drupal\Core\TypedData\DataDefinitionInterface;

/**
 *
 */
class TypedDataLanguageRelationshipDeriver extends TypedDataRelationshipDeriver {
    
    /**
     * {@inheritdoc}
     *
     * @todo this results in awful labels like "Language Language from Content"
     * Fix it.
     */
    protected $label = '@property Language from @base';
    
    /**
     * {@inheritdoc}
     */
    protected function generateDerivativeDefinition($base_plugin_definition, $data_type_id, $data_type_definition, DataDefinitionInterface $base_definition, $property_name, DataDefinitionInterface $property_definition) {
        if (method_exists($property_definition, 'getType') && $property_definition->getType() == 'language') {
            parent::generateDerivativeDefinition($base_plugin_definition, $data_type_id, $data_type_definition, $base_definition, $property_name, $property_definition);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDerivativeDefinitions($base_plugin_definition) {
        parent::getDerivativeDefinitions($base_plugin_definition);
        // The data types will all be set to string since language extends string
        // and the parent class finds the related primitive.
        foreach ($this->derivatives as $plugin_id => $derivative) {
            $this->derivatives[$plugin_id]['data_type'] = 'language';
        }
        return $this->derivatives;
    }

}