class SearchPage

class SearchPage extends Variable {
    
    /**
     * {@inheritdoc}
     */
    protected function initializeIterator() {
        return new \ArrayIterator($this->values());
    }
    
    /**
     * {@inheritdoc}
     */
    protected function values() {
        $search_active_modules = $this->variableGet('search_active_modules', '');
        $values = [];
        foreach ([
            'node',
            'user',
        ] as $module) {
            if (isset($search_active_modules[$module])) {
                // Add a module key to identify the source search provider. This value
                // is used in the EntitySearchPage destination plugin.
                $tmp = [
                    'module' => $module,
                    'status' => $search_active_modules[$module],
                ];
                // Add the node_rank_* variables (only relevant to the node module).
                if ($module === 'node') {
                    $tmp = array_merge($tmp, parent::values());
                }
                $values[] = $tmp;
            }
        }
        return $values;
    }
    
    /**
     * {@inheritdoc}
     */
    public function fields() {
        return [
            'module' => $this->t('The module providing a search page.'),
            'status' => $this->t('Whether or not this module is enabled for search.'),
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIds() {
        $ids['module']['type'] = 'string';
        return $ids;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function doCount() {
        return $this->initializeIterator()
            ->count();
    }
    
    /**
     * {@inheritdoc}
     */
    public function prepareRow(Row $row) {
        $exists = $this->moduleExists($row->getSourceProperty('module'));
        $row->setSourceProperty('module_exists', $exists);
        return parent::prepareRow($row);
    }

}