class TypedDataRelationshipDeriver

class TypedDataRelationshipDeriver extends TypedDataPropertyDeriverBase implements ContainerDeriverInterface {
    
    /**
     * {@inheritdoc}
     */
    protected function generateDerivativeDefinition($base_plugin_definition, $data_type_id, $data_type_definition, DataDefinitionInterface $base_definition, $property_name, DataDefinitionInterface $property_definition) {
        $bundle_info = $base_definition->getConstraint('Bundle');
        // Identify base definitions that appear on bundle-able entities.
        if ($bundle_info && array_filter($bundle_info) && $base_definition->getConstraint('EntityType')) {
            $base_data_type = 'entity:' . $base_definition->getConstraint('EntityType');
        }
        else {
            $base_data_type = $data_type_id;
        }
        // If we've not processed this thing before.
        if (!isset($this->derivatives[$base_data_type . ':' . $property_name])) {
            $derivative = $base_plugin_definition;
            $derivative['label'] = $this->t($this->label, [
                '@property' => $property_definition->getLabel(),
                '@base' => $data_type_definition['label'],
            ]);
            $main_property = $property_definition->getFieldStorageDefinition()
                ->getPropertyDefinition($property_definition->getFieldStorageDefinition()
                ->getMainPropertyName());
            if ($main_property) {
                $derivative['data_type'] = $main_property->getDataType();
                $derivative['property_name'] = $property_name;
                if (strpos($base_data_type, 'entity:') === 0) {
                    $context_definition = new EntityContextDefinition($base_data_type, $this->typedDataManager
                        ->createDataDefinition($base_data_type));
                }
                else {
                    $context_definition = new ContextDefinition($base_data_type, $this->typedDataManager
                        ->createDataDefinition($base_data_type));
                }
                // Add the constraints of the base definition to the context definition.
                if ($base_definition->getConstraint('Bundle')) {
                    $context_definition->addConstraint('Bundle', $base_definition->getConstraint('Bundle'));
                }
                $derivative['context_definitions'] = [
                    'base' => $context_definition,
                ];
                $derivative['property_name'] = $property_name;
                $this->derivatives[$base_data_type . ':' . $property_name] = $derivative;
            }
        }
        elseif ($property_definition instanceof FieldConfigInterface) {
            // We should only end up in here on entity bundles.
            $derivative = $this->derivatives[$base_data_type . ':' . $property_name];
            // Update label.
            
            /** @var \Drupal\Core\StringTranslation\TranslatableMarkup $label */
            $label = $derivative['label'];
            [
                ,
                ,
                $argument_name,
            ] = explode(':', $data_type_id);
            $arguments = $label->getArguments();
            $arguments['@' . $argument_name] = $data_type_definition['label'];
            $string_args = $arguments;
            array_shift($string_args);
            $last = array_slice($string_args, -1);
            // The slice doesn't remove, so do that now.
            array_pop($string_args);
            $string = count($string_args) >= 2 ? '@property from ' . implode(', ', array_keys($string_args)) . ' and ' . array_keys($last)[0] : '@property from @base and ' . array_keys($last)[0];
            $this->derivatives[$base_data_type . ':' . $property_name]['label'] = $this->t($string, $arguments);
            if ($base_definition->getConstraint('Bundle')) {
                // Add bundle constraints.
                $context_definition = $derivative['context_definitions']['base'];
                $bundles = $context_definition->getConstraint('Bundle') ?: [];
                $bundles = array_merge($bundles, $base_definition->getConstraint('Bundle'));
                $context_definition->addConstraint('Bundle', $bundles);
            }
        }
    }

}