PHP - EmptyIterator

php_empty_iterator.php

<?php
/**
 * Class Adapter
 */
abstract class Adapter extends RecursiveArrayIterator{

}

/**
 * Class GoogleDriveAdapter
 */
class GoogleDriveAdapter extends Adapter{

}

/**
 * Class AmazonS3Adapter
 */
class AmazonS3Adapter extends Adapter{

}

/**
 * Class AdaptersFactory
 */
class AdaptersFactory{

    const ADAPTER_GOOGLE_DRIVE = 'GoogleDriveAdapter';
    const ADAPTER_AMAZON_S3 = 'AmazonS3Adapter';

    protected $adapter;

    /**
     * AdaptersFactory constructor.
     * @param $type
     */
    public function __construct($type)
    {
        $oClass = new ReflectionClass(__CLASS__);
        if(!in_array($type,$oClass->getConstants())){
            // EmptyIterator
            $this->adapter =  new EmptyIterator();
        }
        $this->adapter = new $type($this->getOptions()[$type]);
    }

    /**
     * @return mixed
     */
    public function getAdapter(){
        return $this->adapter;
    }

    /**
     * @return array
     */
    public function getOptions(){
        return array(
            'GoogleDriveAdapter' => array(
                'access_token'      => 'test1',
                'app_id'            => 'test1',
                'app_config'        => array(
                    'default_folder' => array(
                        'test' => 'test'
                    )
                )
            ),
            'AmazonS3Adapter' => array(
                'access_token'      => 'test2',
                'app_id'            => 'test2',
                'app_config'        => array(
                    'default_folder' => array(
                        'test' => 'test'
                    )
                )
            )
        );
    }
}


$adapterFactory = new AdaptersFactory(AdaptersFactory::ADAPTER_AMAZON_S3);
foreach($adapterFactory->getAdapter() as $adapter){
    var_dump($adapter);
}