class FacetapiFacetProcessor in Facet API 7.2

Builds base render array used as a starting point for rendering.

The processor constructs the base render array used by widgets across all realms. It is responsible for mapping the raw data returned by the index to human readable values, processing hierarchical data, and building the query strings for each facet item via the adapter's url processor plugin.

Hierarchy

• class \FacetapiFacetProcessor

File

plugins/facetapi/adapter.inc, line 1340

Adapter plugin and adapter related classes.

class FacetapiFacetProcessor {

  /**
   * An array of human readable values keyed by their raw index value.
   *
   * @var array
   */
  protected $map = array();

  /**
   * The facet being processed.
   *
   * @var FacetapiFacet
   */
  protected $facet;

  /**
   * The base render array used as a starting point for rendering.
   *
   * @var array
   */
  protected $build = array();

  /**
   * Array of children keyed by their active parent's index value.
   *
   * @var array
   */
  protected $activeChildren = array();

  /**
   * Constructs a FacetapiAdapter object.
   *
   * Stores the facet being processed.
   *
   * @param FacetapiFacet $facet
   *   The facet being processed.
   */
  public function __construct(FacetapiFacet $facet) {
    $this->facet = $facet;
  }

  /**
   * Builds the base render array used as a starting point for rendering.
   *
   * This method takes the following actions:
   * - Maps index values to their human readable values.
   * - Processes hierarchical data.
   * - Builds each facet item's query string variables.
   */
  public function process() {
    $this->build = array();

    // Only initializes facet if a query type plugin is registered for it.
    // NOTE: We don't use the chaining pattern so the methods can be tested.
    if ($this->facet
      ->getAdapter()
      ->getFacetQuery($this->facet
      ->getFacet())) {
      $this->build = $this
        ->initializeBuild($this->build);
      $this->build = $this
        ->mapValues($this->build);
      if ($this->build) {
        $settings = $this->facet
          ->getSettings();
        if (!$settings->settings['flatten']) {
          $this->build = $this
            ->processHierarchy($this->build);
        }
        $this
          ->processQueryStrings($this->build);
      }
    }
  }

  /**
   * Helper function to get the facet's active items.
   *
   * @return array
   *   The facet's active items. See the FacetapiAdapter::getActiveItems()
   *   return value for the structure of the array.
   *
   * @see FacetapiAdapter::getActiveItems()
   */
  public function getActiveItems() {
    return $this->facet
      ->getAdapter()
      ->getActiveItems($this->facet
      ->getFacet());
  }

  /**
   * Gets an active item's children.
   *
   * @param string $value
   *   The index value of the item.
   *
   * @return array
   *   The active item's children.
   */
  public function getActiveChildren($value) {
    return isset($this->activeChildren[$value]) ? $this->activeChildren[$value] : array();
  }

  /**
   * Gets the initialized render array.
   */
  public function getBuild() {
    return $this->build;
  }

  /**
   * Maps a facet's index value to a human readable value displayed to the user.
   *
   * @param string $value
   *   The raw value passed through the query string.
   *
   * @return string
   *   The mapped value.
   */
  public function getMappedValue($value) {
    return isset($this->map[$value]) ? $this->map[$value] : array(
      '#markup' => $value,
    );
  }

  /**
   * Initializes the facet's render array.
   *
   * @return array
   *   The initialized render array containing:
   *   - #markup: The value displayed to the user.
   *   - #path: The href of the facet link.
   *   - #html: Whether #markup is HTML. If TRUE, it is assumed that the data
   *     has already been properly been sanitized for display.
   *   - #indexed_value: The raw value stored in the index.
   *   - #count: The number of items in the result set.
   *   - #active: An integer flagging whether the facet is active or not.
   *   - #item_parents: An array of the parent index values.
   *   - #item_children: References to the child render arrays.
   */
  protected function initializeBuild() {
    $build = array();

    // Build array defaults.
    $defaults = array(
      '#markup' => '',
      '#path' => $this->facet
        ->getAdapter()
        ->getSearchPath(),
      '#html' => FALSE,
      '#indexed_value' => '',
      '#count' => 0,
      '#active' => 0,
      '#item_parents' => array(),
      '#item_children' => array(),
    );

    // Builds render arrays for each item.
    $adapter = $this->facet
      ->getAdapter();
    $build = $adapter
      ->getFacetQuery($this->facet
      ->getFacet())
      ->build();

    // Invoke the alter callbacks for the facet.
    foreach ($this->facet['alter callbacks'] as $callback) {
      $callback($build, $adapter, $this->facet
        ->getFacet());
    }

    // Iterates over the render array and merges in defaults.
    // @see https://www.drupal.org/node/1398036 for why array_keys() is used
    // instead of element_children().
    foreach (array_keys($build) as $value) {
      $item_defaults = array(
        '#markup' => $value,
        '#indexed_value' => $value,
        '#active' => $adapter
          ->itemActive($this->facet['name'], $value),
      );
      $build[$value] = array_merge($defaults, $item_defaults, $build[$value]);
    }
    return $build;
  }

  /**
   * Maps the IDs to human readable values via the facet's mapping callback.
   *
   * @param array $build
   *   The initialized render array.
   *
   * @return array
   *   The initialized render array with mapped values. See the return of
   *   FacetapiFacetProcessor::initializeBuild() for the structure of the return
   *   array.
   */
  protected function mapValues(array $build) {
    if ($this->facet['map callback']) {

      // Get available items and active items, invoke the map callback only when
      // there are values to map.
      // NOTE: array_merge() doesn't work here when the values are numeric.
      if ($values = array_unique(array_keys($build + $this
        ->getActiveItems()))) {
        $this->map = call_user_func($this->facet['map callback'], $values, $this->facet['map options']);

        // Normalize all mapped values to a two element array.
        foreach ($this->map as $key => $value) {
          if (!is_array($value)) {
            $this->map[$key] = array();
            $this->map[$key]['#markup'] = $value;
            $this->map[$key]['#html'] = FALSE;
          }
          if (isset($build[$key])) {
            $build[$key]['#markup'] = $this->map[$key]['#markup'];
            $build[$key]['#html'] = !empty($this->map[$key]['#html']);
          }
        }
      }
    }
    return $build;
  }

  /**
   * Processes hierarchical relationships between the facet items.
   *
   * @param array $build
   *   The initialized render array.
   *
   * @return array
   *   The initialized render array with processed hierarchical relationships.
   *   See the return of FacetapiFacetProcessor::initializeBuild() for the
   *   structure of the return array.
   */
  protected function processHierarchy(array $build) {

    // Builds the hierarchy information if the hierarchy callback is defined.
    if ($this->facet['hierarchy callback']) {
      $parents = $this->facet['hierarchy callback'](array_keys($build));
      foreach ($parents as $value => $parents) {
        foreach ($parents as $parent) {
          if (isset($build[$parent]) && isset($build[$value])) {

            // Use a reference so we see the updated data.
            $build[$parent]['#item_children'][$value] =& $build[$value];
            $build[$value]['#item_parents'][$parent] = $parent;
          }
        }
      }
    }

    // Tests whether parents have an active child.
    // @todo: Can we make this more efficient?
    $settings = $this->facet
      ->getSettings();
    if (!$settings->settings['individual_parent']) {
      do {
        $active = 0;
        foreach ($build as $value => $item) {
          if ($item['#active'] && !empty($item['#item_parents'])) {

            // @todo Can we build facets with multiple parents? Core taxonomy
            // form cannot, so we will need a check here.
            foreach ($item['#item_parents'] as $parent) {
              if (!$build[$parent]['#active']) {
                $active = $build[$parent]['#active'] = 1;
              }
            }
          }
        }
      } while ($active);
    }

    // Since the children are copied to their parent's "#item_parents" property
    // during processing, we have to filter the original child items from the
    // top level of the hierarchy.
    return array_filter($build, 'facetapi_filter_top_level_children');
  }

  /**
   * Initializes the render array's query string variables.
   *
   * @param array &$build
   *   The initialized render array.
   */
  protected function processQueryStrings(array &$build) {
    foreach ($build as $value => &$item) {
      $values = array(
        $value,
      );

      // Calculate paths for the children.
      if (!empty($item['#item_children'])) {
        $this
          ->processQueryStrings($item['#item_children']);

        // Merges the childrens' values if the item is active so the children
        // are deactivated along with the parent.
        $settings = $this->facet
          ->getSettings();
        if (!$settings->settings['individual_parent']) {
          if ($item['#active']) {
            $values = array_merge(facetapi_get_child_values($item['#item_children']), $values);
          }
        }
      }

      // Stores this item's active children so we can deactivate them in the
      // current search block as well.
      $this->activeChildren[$value] = $values;

      // Formats path and query string for facet item, sets theme function.
      $item['#path'] = $this
        ->getFacetPath($values, $item['#active']);
      $item['#query'] = $this
        ->getQueryString($values, $item['#active']);
    }
  }

  /**
   * Helper function that returns the path for a facet item.
   *
   * @param array $values
   *   An array containing the item's values being added to or removed from the
   *   query string dependent on whether or not the item is active.
   * @param int $active
   *   An integer flagging whether the item is active or not.
   *
   * @return string
   *   The facet path.
   *
   * @see FacetapiAdapter::getFacetPath()
   */
  public function getFacetPath(array $values, $active) {
    return $this->facet
      ->getAdapter()
      ->getFacetPath($this->facet
      ->getFacet(), $values, $active);
  }

  /**
   * Helper function that returns the query string variables for a facet item.
   *
   * @param array $values
   *   An array containing the item's values being added to or removed from the
   *   query string dependent on whether or not the item is active.
   * @param int $active
   *   An integer flagging whether the item is active or not.
   *
   * @return array
   *   An array containing the query string variables.
   *
   * @see FacetapiAdapter::getQueryString()
   */
  public function getQueryString(array $values, $active) {
    return $this->facet
      ->getAdapter()
      ->getQueryString($this->facet
      ->getFacet(), $values, $active);
  }

}

Members

Name	Modifiers	Type	Description	Overrides
FacetapiFacetProcessor::$activeChildren	protected	property	Array of children keyed by their active parent's index value.
FacetapiFacetProcessor::$build	protected	property	The base render array used as a starting point for rendering.
FacetapiFacetProcessor::$facet	protected	property	The facet being processed.
FacetapiFacetProcessor::$map	protected	property	An array of human readable values keyed by their raw index value.
FacetapiFacetProcessor::getActiveChildren	public	function	Gets an active item's children.
FacetapiFacetProcessor::getActiveItems	public	function	Helper function to get the facet's active items.
FacetapiFacetProcessor::getBuild	public	function	Gets the initialized render array.
FacetapiFacetProcessor::getFacetPath	public	function	Helper function that returns the path for a facet item.
FacetapiFacetProcessor::getMappedValue	public	function	Maps a facet's index value to a human readable value displayed to the user.
FacetapiFacetProcessor::getQueryString	public	function	Helper function that returns the query string variables for a facet item.
FacetapiFacetProcessor::initializeBuild	protected	function	Initializes the facet's render array.
FacetapiFacetProcessor::mapValues	protected	function	Maps the IDs to human readable values via the facet's mapping callback.
FacetapiFacetProcessor::process	public	function	Builds the base render array used as a starting point for rendering.
FacetapiFacetProcessor::processHierarchy	protected	function	Processes hierarchical relationships between the facet items.
FacetapiFacetProcessor::processQueryStrings	protected	function	Initializes the render array's query string variables.
FacetapiFacetProcessor::__construct	public	function	Constructs a FacetapiAdapter object.