ApplicationContext.php

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

class ApplicationContext {

    protected $contextString;

    protected $rootContextString;

    protected $parentContext;

    public function __construct($contextString) {
        if (strstr($contextString, '/') === FALSE) {
            $this->rootContextString = $contextString;
            $this->parentContext = NULL;
        } else {
            $contextStringParts = explode('/', $contextString);
            $this->rootContextString = $contextStringParts[0];
            array_pop($contextStringParts);
            $this->parentContext = new ApplicationContext(implode('/', $contextStringParts));
        }

        if (!in_array($this->rootContextString, array('Development', 'Production', 'Testing'))) {
            throw new \TYPO3\CMS\Core\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;
    }
}