<?php
/**
* An autoloader that uses class map
*
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\Autoload;

class ClassMap
{
/**
* Absolute path to base directory that will be prepended as prefix to the included files
*
* @var string
*/
protected $_baseDir;

/**
* Map of class name to file (relative to the base directory)
*
* array(
* 'Class_Name' => 'relative/path/to/Class/Name.php',
* )
*
* @var array
*/
protected $_map = [];

/**
* Set base directory absolute path
*
* @param string $baseDir
* @throws \InvalidArgumentException
*/
public function __construct($baseDir)
{
$this->_baseDir = realpath($baseDir);
if (!$this->_baseDir || !is_dir($this->_baseDir)) {
throw new \InvalidArgumentException("Specified path is not a valid directory: '{$baseDir}'");
}
}

/**
* Find an absolute path to a file to be included
*
* @param string $class
* @return string|bool
*/
public function getFile($class)
{
if (isset($this->_map[$class])) {
return $this->_baseDir . '/' . $this->_map[$class];
}
return false;
}

/**
* Add classes files declaration to the map. New map will override existing values if such was defined before.
*
* @param array $map
* @return $this
*/
public function addMap(array $map)
{
$this->_map = array_merge($this->_map, $map);
return $this;
}

/**
* Resolve a class file and include it
*
* @param string $class
* @return void
*/
public function load($class)
{
$file = $this->getFile($class);
if (file_exists($file)) {
include $file;
}
}
}