ApplicationContext.php

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<?php
namespace TYPO3\CMS\Core\Core;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Core\Exception;

class ApplicationContext
{
    protected $contextString;

    protected $rootContextString;

    protected $parentContext;

    public function __construct($contextString)
    {
        if (strpos($contextString, '/') === false) {
            $this->rootContextString = $contextString;
            $this->parentContext = null;
        } else {
            $contextStringParts = explode('/', $contextString);
            $this->rootContextString = $contextStringParts[0];
            array_pop($contextStringParts);
            $this->parentContext = new self(implode('/', $contextStringParts));
        }

        if (!in_array($this->rootContextString, ['Development', 'Production', 'Testing'], true)) {
            throw new Exception('The given context "' . $contextString . '" was not valid. Only allowed are Development, Production and Testing, including their sub-contexts', 1335436551);
        }

        $this->contextString = $contextString;
    }

    public function __toString()
    {
        return $this->contextString;
    }

    public function isDevelopment()
    {
        return $this->rootContextString === 'Development';
    }

    public function isProduction()
    {
        return $this->rootContextString === 'Production';
    }

    public function isTesting()
    {
        return $this->rootContextString === 'Testing';
    }

    public function getParent()
    {
        return $this->parentContext;
    }
}