LoadedExtensionsArray.php

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

/*
 * 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!
 */

class LoadedExtensionsArray implements \Iterator, \ArrayAccess, \Serializable, \Countable
{
    protected $packageManager;

    protected $loadedExtensionArrayElementCache = array();

    protected $iteratorPosition;

    public function __construct(\TYPO3\CMS\Core\Package\PackageManager $packageManager)
    {
        $this->packageManager = $packageManager;
    }

    public function offsetExists($offset)
    {
        return $this->packageManager->isPackageActive($offset);
    }

    public function offsetGet($offset)
    {
        // Pass it through the package manager, as it resolves package aliases
        $package = $this->packageManager->getPackage($offset);
        $packageKey = $package->getPackageKey();
        if (!isset($this->loadedExtensionArrayElementCache[$packageKey])) {
            $this->loadedExtensionArrayElementCache[$packageKey] = new LoadedExtensionArrayElement($package);
        }
        return $this->loadedExtensionArrayElementCache[$packageKey];
    }

    public function offsetSet($offset, $value)
    {
        throw new \InvalidArgumentException('The array $GLOBALS[\'TYPO3_LOADED_EXT\'] may not be modified.', 1361915596);
    }

    public function offsetUnset($offset)
    {
        throw new \InvalidArgumentException('The array $GLOBALS[\'TYPO3_LOADED_EXT\'] may not be modified.', 1361915610);
    }

    public function serialize()
    {
        return serialize($this->loadedExtensionArrayElementCache);
    }

    public function unserialize($serialized)
    {
        $this->loadedExtensionArrayElementCache = unserialize($serialized);
    }

    public function count()
    {
        return count($this->packageManager->getActivePackages());
    }


    public function current()
    {
        return $this->offsetGet($this->iteratorPosition);
    }

    public function next()
    {
        $packageKeys = array_keys($this->packageManager->getActivePackages());
        $position = array_search($this->iteratorPosition, $packageKeys);
        if (isset($packageKeys[$position + 1])) {
            $this->iteratorPosition = $packageKeys[$position + 1];
        } else {
            $this->iteratorPosition = null;
        }
    }

    public function key()
    {
        return $this->iteratorPosition;
    }

    public function valid()
    {
        return $this->offsetExists($this->iteratorPosition);
    }

    public function rewind()
    {
        $keys = array_keys($this->packageManager->getActivePackages());
        $this->iteratorPosition = array_shift($keys);
    }

    public function reset()
    {
        $this->loadedExtensionArrayElementCache = array();
        $this->rewind();
    }

    public function hasPackageManager()
    {
        return $this->packageManager !== null;
    }

    public function toArray()
    {
        return array_map(
            function ($loadedExtElement) {
                return $loadedExtElement->toArray();
            },
            iterator_to_array($this)
        );
    }
}