File "TransformerService.php"
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<?php
namespace Automattic\WooCommerce\Admin\RemoteInboxNotifications;
use InvalidArgumentException;
use stdClass;
/**
* A simple service class for the Transformer classes.
*
* Class TransformerService
*
* @package Automattic\WooCommerce\Admin\RemoteInboxNotifications
*/
class TransformerService {
/**
* Create a transformer object by name.
*
* @param string $name name of the transformer.
*
* @return TransformerInterface|null
*/
public static function create_transformer( $name ) {
$camel_cased = str_replace( ' ', '', ucwords( str_replace( '_', ' ', $name ) ) );
$classname = __NAMESPACE__ . '\\Transformers\\' . $camel_cased;
if ( ! class_exists( $classname ) ) {
return null;
}
return new $classname();
}
/**
* Apply transformers to the given value.
*
* @param mixed $target_value a value to transform.
* @param array $transformer_configs transform configuration.
* @param string $default default value.
*
* @throws InvalidArgumentException Throws when one of the requried arguments is missing.
* @return mixed|null
*/
public static function apply( $target_value, array $transformer_configs, $default ) {
foreach ( $transformer_configs as $transformer_config ) {
if ( ! isset( $transformer_config->use ) ) {
throw new InvalidArgumentException( 'Missing required config value: use' );
}
if ( ! isset( $transformer_config->arguments ) ) {
$transformer_config->arguments = null;
}
$transformer = self::create_transformer( $transformer_config->use );
if ( null === $transformer ) {
throw new InvalidArgumentException( "Unable to find a transformer by name: {$transformer_config->use}" );
}
$transformed_value = $transformer->transform( $target_value, $transformer_config->arguments, $default );
// if the transformer returns null, then return the previously transformed value.
if ( null === $transformed_value ) {
return $target_value;
}
$target_value = $transformed_value;
}
return $target_value;
}
}