UserModes.php
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UserModes.php
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	<?php

	namespace MobileFrontend\Features;

	use ArrayIterator;
	use IteratorAggregate;
	use Traversable;

	/**
	* User Modes collection
	*
	* This class exists to provide a safe collection of IUserModes
	* @package MobileFrontend\Features
	*/
	class UserModes implements IteratorAggregate {

	/**
	* @var array<string,IUserMode>
	*/
	private $modes = [];

	/**
	* Register new User Mode
	* @param IUserMode $mode
	*/
	public function registerMode( IUserMode $mode ) {
	$this->modes[$mode->getModeIdentifier()] = $mode;
	}

	/**
	* Retrieve registered mode
	*
	* @param string $modeIdentifier
	* @return IUserMode
	*/
	public function getMode( $modeIdentifier ) {
	if ( !array_key_exists( $modeIdentifier, $this->modes ) ) {
	throw new \RuntimeException( "$modeIdentifier User mode is undefined" );
	}
	return $this->modes[$modeIdentifier];
	}

	/**
	* @return ArrayIterator
	*/
	public function getIterator(): Traversable {
	return new ArrayIterator( $this->modes );
	}

	}