NoTransform.php
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NoTransform.php
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	<?php

	namespace MobileFrontend\Transforms;

	use DOMElement;

	class NoTransform implements IMobileTransform {

	/** @var self */
	private static $instance;

	/**
	* Returns a static instance of NoTransform class.
	*
	* Note: There's no need in many instances of this class as it does nothing.
	* So it's a common pre-optimization to make such classes as singleton, what's
	* rather a matter of convenience than real optimization.
	*
	* @return self
	*/
	public static function getInstance(): self {
	if ( self::$instance === null ) {
	self::$instance = new self();
	}
	return self::$instance;
	}

	/**
	* Does nothing.
	* @param DOMElement $node to be transformed
	*/
	public function apply( DOMElement $node ) {
	// nothing happens
	}
	}