ClassMap.php

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<?php
namespace Magento\Framework\Autoload;

class ClassMap
{
    protected $_baseDir;

    protected $_map = [];

    public function __construct($baseDir)
    {
        $this->_baseDir = realpath($baseDir);
        if (!$this->_baseDir || !is_dir($this->_baseDir)) {
            throw new \InvalidArgumentException("Specified path is not a valid directory: '{$baseDir}'");
        }
    }

    public function getFile($class)
    {
        if (isset($this->_map[$class])) {
            return $this->_baseDir . '/' . $this->_map[$class];
        }
        return false;
    }

    public function addMap(array $map)
    {
        $this->_map = array_merge($this->_map, $map);
        return $this;
    }

    public function load($class)
    {
        $file = $this->getFile($class);
        if (file_exists($file)) {
            include $file;
        }
    }
}