facets-8.x-1.x-dev/src/Plugin/facets/query_type/SearchApiRange.php

<?php

namespace Drupal\facets\Plugin\facets\query_type;

use Drupal\facets\QueryType\QueryTypePluginBase;
use Drupal\facets\Result\Result;
use Drupal\search_api\Query\QueryInterface;

/**
 * Provides support for range facets within the Search API scope.
 *
 * This is the default implementation that works with all backends.
 *
 * @FacetsQueryType(
 *   id = "search_api_range",
 *   label = @Translation("Range"),
 * )
 */
class SearchApiRange extends QueryTypePluginBase {

  /**
   * {@inheritdoc}
   */
  public function execute() {
    $query = $this->query;
    $operator = $this->facet->getQueryOperator();
    $field_identifier = $this->facet->getFieldIdentifier();
    $exclude = $this->facet->getExclude();

    if ($query->getProcessingLevel() === QueryInterface::PROCESSING_FULL) {
      // Set the options for the actual query.
      $options = &$query->getOptions();
      $options['search_api_facets'][$field_identifier] = $this->getFacetOptions();
    }

    // Add the filter to the query if there are active values.
    $active_items = $this->facet->getActiveItems();

    if (count($active_items)) {
      $filter = $query->createConditionGroup($operator, ['facet:' . $field_identifier]);
      foreach ($active_items as $value) {
        $filter->addCondition($field_identifier, $value, $exclude ? 'NOT BETWEEN' : 'BETWEEN');
      }
      $query->addConditionGroup($filter);
    }
  }

  /**
   * {@inheritdoc}
   */
  public function build() {
    $query_operator = $this->facet->getQueryOperator();

    if (!empty($this->results)) {
      $facet_results = [];
      foreach ($this->results as $result) {
        if ($result['count'] || $query_operator === 'or') {
          $count = $result['count'];
          while (is_array($result['filter'])) {
            $result['filter'] = current($result['filter']);
          }
          $result_filter = trim($result['filter'], '"');
          if ($result_filter === 'NULL' || $result_filter === '') {
            // "Missing" facet items could not be handled in ranges.
            continue;
          }

          $result = new Result($this->facet, $result_filter, $result_filter, $count);
          $facet_results[] = $result;
        }
      }
      $this->facet->setResults($facet_results);
    }
    return $this->facet;
  }

}