wikimedia/mediawiki-extensions-MobileFrontend

<?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
    }
}