AdapterFactory.php

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<?php
namespace Magento\Framework\Image;

class AdapterFactory
{
    protected $config;

    protected $objectManager;

    protected $adapterMap;

    public function __construct(
        \Magento\Framework\ObjectManagerInterface $objectManager,
        \Magento\Framework\Image\Adapter\ConfigInterface $config,
        array $adapterMap = []
    ) {
        $this->objectManager = $objectManager;
        $this->config = $config;
        $this->adapterMap = $adapterMap;
    }

    public function create($adapterAlias = null)
    {
        $this->adapterMap = array_merge($this->config->getAdapters(), $this->adapterMap);
        $adapterAlias = !empty($adapterAlias) ? $adapterAlias : $this->config->getAdapterAlias();
        if (empty($adapterAlias)) {
            throw new \InvalidArgumentException('Image adapter is not selected.');
        }
        if (empty($this->adapterMap[$adapterAlias]['class'])) {
            throw new \InvalidArgumentException("Image adapter for '{$adapterAlias}' is not setup.");
        }
        $imageAdapter = $this->objectManager->create($this->adapterMap[$adapterAlias]['class']);
        if (!$imageAdapter instanceof Adapter\AdapterInterface) {
            throw new \InvalidArgumentException(
                $this->adapterMap[$adapterAlias]['class'] .
                ' is not instance of \Magento\Framework\Image\Adapter\AdapterInterface'
            );
        }
        $imageAdapter->checkDependencies();
        return $imageAdapter;
    }
}