IndexTidDepth.php

<?php

namespace Drupal\taxonomy\Plugin\views\argument;

use Drupal\Core\Database\Database;
use Drupal\Core\Database\Query\Condition;
use Drupal\Core\Entity\EntityStorageInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\views\Plugin\views\argument\ArgumentPluginBase;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Argument handler for taxonomy terms with depth.
 *
 * This handler is actually part of the node table and has some restrictions,
 * because it uses a subquery to find nodes with.
 *
 * @ingroup views_argument_handlers
 *
 * @ViewsArgument("taxonomy_index_tid_depth")
 */
class IndexTidDepth extends ArgumentPluginBase implements ContainerFactoryPluginInterface {
    
    /**
     * @var \Drupal\Core\Entity\EntityStorageInterface
     */
    protected $termStorage;
    
    /**
     * {@inheritdoc}
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityStorageInterface $termStorage) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
        $this->termStorage = $termStorage;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('entity_type.manager')
            ->getStorage('taxonomy_term'));
    }
    protected function defineOptions() {
        $options = parent::defineOptions();
        $options['depth'] = [
            'default' => 0,
        ];
        $options['break_phrase'] = [
            'default' => FALSE,
        ];
        $options['use_taxonomy_term_path'] = [
            'default' => FALSE,
        ];
        return $options;
    }
    public function buildOptionsForm(&$form, FormStateInterface $form_state) {
        $form['depth'] = [
            '#type' => 'weight',
            '#title' => $this->t('Depth'),
            '#default_value' => $this->options['depth'],
            '#description' => $this->t('The depth will match nodes tagged with terms in the hierarchy. For example, if you have the term "fruit" and a child term "apple", with a depth of 1 (or higher) then filtering for the term "fruit" will get nodes that are tagged with "apple" as well as "fruit". If negative, the reverse is true; searching for "apple" will also pick up nodes tagged with "fruit" if depth is -1 (or lower).'),
        ];
        $form['break_phrase'] = [
            '#type' => 'checkbox',
            '#title' => $this->t('Allow multiple values'),
            '#description' => $this->t('If selected, users can enter multiple values in the form of 1+2+3. Due to the number of JOINs it would require, AND will be treated as OR with this filter.'),
            '#default_value' => !empty($this->options['break_phrase']),
        ];
        parent::buildOptionsForm($form, $form_state);
    }
    
    /**
     * Override defaultActions() to remove summary actions.
     */
    protected function defaultActions($which = NULL) {
        if ($which) {
            if (in_array($which, [
                'ignore',
                'not found',
                'empty',
                'default',
            ])) {
                return parent::defaultActions($which);
            }
            return;
        }
        $actions = parent::defaultActions();
        unset($actions['summary asc']);
        unset($actions['summary desc']);
        unset($actions['summary asc by count']);
        unset($actions['summary desc by count']);
        return $actions;
    }
    public function query($group_by = FALSE) {
        $this->ensureMyTable();
        if (!empty($this->options['break_phrase'])) {
            $break = static::breakString($this->argument);
            if ($break->value === [
                -1,
            ]) {
                return FALSE;
            }
            $operator = count($break->value) > 1 ? 'IN' : '=';
            $tids = $break->value;
        }
        else {
            $operator = "=";
            $tids = $this->argument;
        }
        // Now build the subqueries.
        $subquery = Database::getConnection()->select('taxonomy_index', 'tn');
        $subquery->addField('tn', 'nid');
        $where = (new Condition('OR'))->condition('tn.tid', $tids, $operator);
        $last = "tn";
        if ($this->options['depth'] > 0) {
            $subquery->leftJoin('taxonomy_term__parent', 'th', "th.entity_id = tn.tid");
            $last = "th";
            foreach (range(1, abs($this->options['depth'])) as $count) {
                $subquery->leftJoin('taxonomy_term__parent', "th{$count}", "{$last}.parent_target_id = th{$count}.entity_id");
                $where->condition("th{$count}.entity_id", $tids, $operator);
                $last = "th{$count}";
            }
        }
        elseif ($this->options['depth'] < 0) {
            foreach (range(1, abs($this->options['depth'])) as $count) {
                $field = $count == 1 ? 'tid' : 'entity_id';
                $subquery->leftJoin('taxonomy_term__parent', "th{$count}", "{$last}.{$field} = th{$count}.parent_target_id");
                $where->condition("th{$count}.entity_id", $tids, $operator);
                $last = "th{$count}";
            }
        }
        $subquery->condition($where);
        $this->query
            ->addWhere(0, "{$this->tableAlias}.{$this->realField}", $subquery, 'IN');
    }
    public function title() {
        $term = $this->termStorage
            ->load($this->argument);
        if (!empty($term)) {
            return $term->getName();
        }
        // TODO review text
        return $this->t('No name');
    }

}