MetadataProcessor.php

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<?php
namespace Magento\Framework\App\Config;

class MetadataProcessor
{
    protected $_processorFactory;

    protected $_metadata = [];

    public function __construct(
        \Magento\Framework\App\Config\Data\ProcessorFactory $processorFactory,
        Initial $initialConfig
    ) {
        $this->_processorFactory = $processorFactory;
        $this->_metadata = $initialConfig->getMetadata();
    }

    protected function _getValue(array $data, $path)
    {
        $keys = explode('/', $path);
        foreach ($keys as $key) {
            if (is_array($data) && array_key_exists($key, $data)) {
                $data = $data[$key];
            } else {
                return null;
            }
        }
        return $data;
    }

    protected function _setValue(array &$container, $path, $value)
    {
        $segments = explode('/', $path);
        $currentPointer = & $container;
        foreach ($segments as $segment) {
            if (!isset($currentPointer[$segment])) {
                $currentPointer[$segment] = [];
            }
            $currentPointer = & $currentPointer[$segment];
        }
        $currentPointer = $value;
    }

    public function process(array $data)
    {
        foreach ($this->_metadata as $path => $metadata) {
            $processor = $this->_processorFactory->get($metadata['backendModel']);
            $value = $processor->processValue($this->_getValue($data, $path));
            $this->_setValue($data, $path, $value);
        }
        return $data;
    }
}