public function apply($transformer, $instant_article, $node)
 {
     // Builds the slideshow
     $slideshow = Slideshow::create();
     $instant_article->addChild($slideshow);
     $gallery = $this->getProperty(self::PROPERTY_JETPACK_DATA_GALLERY, $node);
     if ($gallery && isset($gallery)) {
         foreach ($gallery as $gallery_image) {
             // Constructs Image if it contains URL
             if (!Type::isTextEmpty($gallery_image['src'])) {
                 $image = Image::create();
                 $image->withURL($gallery_image['src']);
                 // Constructs Caption element when present in the JSON
                 if (!Type::isTextEmpty($gallery_image['caption'])) {
                     $caption = Caption::create();
                     $caption->appendText($gallery_image['caption']);
                     $image->withCaption($caption);
                 }
                 $slideshow->addImage($image);
             }
         }
     }
     $transformer->transform($slideshow, $node);
     return $instant_article;
 }
 public function apply($transformer, $instant_article, $node)
 {
     // Builds the slideshow
     $slideshow = Slideshow::create();
     $instant_article->addChild($slideshow);
     $transformer->transform($slideshow, $node);
     return $instant_article;
 }