FileResolver.php

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<?php
namespace Magento\Framework\Filesystem;

class FileResolver
{
    public function getFile($class)
    {
        $relativePath = $this->getFilePath($class);
        return stream_resolve_include_path($relativePath);
    }

    public function getFilePath($class)
    {
        return ltrim(str_replace(['_', '\\'], '/', $class), '/') . '.php';
    }

    public static function addIncludePath($path, $prepend = true)
    {
        $includePathExtra = implode(PATH_SEPARATOR, (array)$path);
        $includePath = get_include_path();
        $pathSeparator = $includePath && $includePathExtra ? PATH_SEPARATOR : '';
        if ($prepend) {
            $includePath = $includePathExtra . $pathSeparator . $includePath;
        } else {
            $includePath = $includePath . $pathSeparator . $includePathExtra;
        }
        set_include_path($includePath);
    }
}