ExposedFormCache.php

<?php

namespace Drupal\views;


/**
 * Caches exposed forms, as they are heavy to generate.
 *
 * @see \Drupal\views\Form\ViewsExposedForm
 */
class ExposedFormCache {
    
    /**
     * Stores the exposed form data.
     *
     * @var array
     */
    protected $cache = [];
    
    /**
     * Save the Views exposed form for later use.
     *
     * @param string $view_id
     *   The views ID.
     * @param string $display_id
     *   The current view display name.
     * @param array $form_output
     *   The form structure. Only needed when inserting the value.
     */
    public function setForm($view_id, $display_id, array $form_output) {
        // Save the form output.
        $views_exposed[$view_id][$display_id] = $form_output;
    }
    
    /**
     * Retrieves the views exposed form from cache.
     *
     * @param string $view_id
     *   The views ID.
     * @param string $display_id
     *   The current view display name.
     *
     * @return array|bool
     *   The form structure, if any, otherwise FALSE.
     */
    public function getForm($view_id, $display_id) {
        // Return the form output, if any.
        if (empty($this->cache[$view_id][$display_id])) {
            return FALSE;
        }
        else {
            return $this->cache[$view_id][$display_id];
        }
    }
    
    /**
     * Rests the form cache.
     */
    public function reset() {
        $this->cache = [];
    }

}