LoadedExtensionsArray.php

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