class DefaultLazyPluginCollection in Plug 7

Provides a default plugin collection for a plugin type.

A plugin collection is used to contain plugins that will be lazily instantiated. The configurations of each potential plugin are passed in, and the configuration key containing the plugin ID is specified by self::$pluginKey.

Hierarchy

class \Drupal\Component\Plugin\LazyPluginCollection implements \Drupal\Component\Plugin\IteratorAggregate, \Drupal\Component\Plugin\Countable
- class \Drupal\Core\Plugin\DefaultLazyPluginCollection

Expanded class hierarchy of DefaultLazyPluginCollection

File

lib/Drupal/Core/Plugin/DefaultLazyPluginCollection.php, line 23: Contains \Drupal\Core\Plugin\DefaultLazyPluginCollection.

Namespace

Drupal\Core\Plugin

View source

class DefaultLazyPluginCollection extends LazyPluginCollection {

  /**
   * The manager used to instantiate the plugins.
   *
   * @var \Drupal\Component\Plugin\PluginManagerInterface
   */
  protected $manager;

  /**
   * The initial configuration for each plugin in the collection.
   *
   * @var array
   *   An associative array containing the initial configuration for each plugin
   *   in the collection, keyed by plugin instance ID.
   */
  protected $configurations = array();

  /**
   * The key within the plugin configuration that contains the plugin ID.
   *
   * @var string
   */
  protected $pluginKey = 'id';

  /**
   * The original order of the instances.
   *
   * @var array
   */
  protected $originalOrder = array();

  /**
   * Constructs a new DefaultLazyPluginCollection object.
   *
   * @param \Drupal\Component\Plugin\PluginManagerInterface $manager
   *   The manager to be used for instantiating plugins.
   * @param array $configurations
   *   (optional) An associative array containing the initial configuration for
   *   each plugin in the collection, keyed by plugin instance ID.
   */
  public function __construct(PluginManagerInterface $manager, array $configurations = array()) {
    $this->manager = $manager;
    $this->configurations = $configurations;
    if (!empty($configurations)) {
      $instance_ids = array_keys($configurations);
      $this->instanceIDs = array_combine($instance_ids, $instance_ids);

      // Store the original order of the instance IDs for export.
      $this->originalOrder = $this->instanceIDs;
    }
  }

  /**
   * {@inheritdoc}
   */
  protected function initializePlugin($instance_id) {
    $configuration = isset($this->configurations[$instance_id]) ? $this->configurations[$instance_id] : array();
    if (!isset($configuration[$this->pluginKey])) {
      throw new PluginNotFoundException($instance_id);
    }
    $this
      ->set($instance_id, $this->manager
      ->createInstance($configuration[$this->pluginKey], $configuration));
  }

  /**
   * Sorts all plugin instances in this collection.
   *
   * @return $this
   */
  public function sort() {
    uasort($this->instanceIDs, array(
      $this,
      'sortHelper',
    ));
    return $this;
  }

  /**
   * Provides uasort() callback to sort plugins.
   */
  public function sortHelper($aID, $bID) {
    $a = $this
      ->get($aID);
    $b = $this
      ->get($bID);
    return strnatcasecmp($a
      ->getPluginId(), $b
      ->getPluginId());
  }

  /**
   * {@inheritdoc}
   */
  public function getConfiguration() {
    $instances = array();

    // Store the current order of the instances.
    $current_order = $this->instanceIDs;

    // Reorder the instances to match the original order, adding new instances
    // to the end.
    $this->instanceIDs = $this->originalOrder + $current_order;
    foreach ($this as $instance_id => $instance) {
      if ($instance instanceof ConfigurablePluginInterface) {
        $instances[$instance_id] = $instance
          ->getConfiguration();
      }
      else {
        $instances[$instance_id] = $this->configurations[$instance_id];
      }
    }

    // Restore the current order.
    $this->instanceIDs = $current_order;
    return $instances;
  }

  /**
   * {@inheritdoc}
   */
  public function setConfiguration($configuration) {

    // Track each instance ID as it is updated.
    $unprocessed_instance_ids = $this
      ->getInstanceIds();
    foreach ($configuration as $instance_id => $instance_configuration) {
      $this
        ->setInstanceConfiguration($instance_id, $instance_configuration);

      // Remove this instance ID from the list being updated.
      unset($unprocessed_instance_ids[$instance_id]);
    }

    // Remove remaining instances that had no configuration specified for them.
    foreach ($unprocessed_instance_ids as $unprocessed_instance_id) {
      $this
        ->removeInstanceId($unprocessed_instance_id);
    }
    return $this;
  }

  /**
   * Updates the configuration for a plugin instance.
   *
   * If there is no plugin instance yet, a new will be instantiated. Otherwise,
   * the existing instance is updated with the new configuration.
   *
   * @param string $instance_id
   *   The ID of a plugin to set the configuration for.
   * @param array $configuration
   *   The plugin configuration to set.
   */
  public function setInstanceConfiguration($instance_id, array $configuration) {
    $this->configurations[$instance_id] = $configuration;
    $instance = $this
      ->get($instance_id);
    if ($instance instanceof ConfigurablePluginInterface) {
      $instance
        ->setConfiguration($configuration);
    }
  }

  /**
   * {@inheritdoc}
   */
  public function addInstanceId($id, $configuration = NULL) {
    parent::addInstanceId($id);
    if ($configuration !== NULL) {
      $this
        ->setInstanceConfiguration($id, $configuration);
    }
    if (!isset($this->originalOrder[$id])) {
      $this->originalOrder[$id] = $id;
    }
  }

  /**
   * {@inheritdoc}
   */
  public function removeInstanceId($instance_id) {
    parent::removeInstanceId($instance_id);
    unset($this->originalOrder[$instance_id]);
    unset($this->configurations[$instance_id]);
  }

}

Members

Name	Modifiers	Type	Description
DefaultLazyPluginCollection::$configurations	protected	property	The initial configuration for each plugin in the collection.
DefaultLazyPluginCollection::$manager	protected	property	The manager used to instantiate the plugins.
DefaultLazyPluginCollection::$originalOrder	protected	property	The original order of the instances.
DefaultLazyPluginCollection::$pluginKey	protected	property	The key within the plugin configuration that contains the plugin ID.
DefaultLazyPluginCollection::addInstanceId	public	function	Adds an instance ID to the available instance IDs. Overrides LazyPluginCollection::addInstanceId
DefaultLazyPluginCollection::getConfiguration	public	function	Gets the current configuration of all plugins in this collection. Overrides LazyPluginCollection::getConfiguration
DefaultLazyPluginCollection::initializePlugin	protected	function	Initializes and stores a plugin. Overrides LazyPluginCollection::initializePlugin
DefaultLazyPluginCollection::removeInstanceId	public	function	Removes an instance ID. Overrides LazyPluginCollection::removeInstanceId
DefaultLazyPluginCollection::setConfiguration	public	function	Sets the configuration for all plugins in this collection. Overrides LazyPluginCollection::setConfiguration
DefaultLazyPluginCollection::setInstanceConfiguration	public	function	Updates the configuration for a plugin instance.
DefaultLazyPluginCollection::sort	public	function	Sorts all plugin instances in this collection.
DefaultLazyPluginCollection::sortHelper	public	function	Provides uasort() callback to sort plugins.
DefaultLazyPluginCollection::__construct	public	function	Constructs a new DefaultLazyPluginCollection object.
LazyPluginCollection::$instanceIDs	protected	property	Stores the IDs of all potential plugin instances.
LazyPluginCollection::$pluginInstances	protected	property	Stores all instantiated plugins.
LazyPluginCollection::clear	public	function	Clears all instantiated plugins.
LazyPluginCollection::count	public	function
LazyPluginCollection::get	public	function	Gets a plugin instance, initializing it if necessary.
LazyPluginCollection::getInstanceIds	public	function	Gets all instance IDs.
LazyPluginCollection::getIterator	public	function
LazyPluginCollection::has	public	function	Determines if a plugin instance exists.
LazyPluginCollection::remove	public	function	Removes an initialized plugin.
LazyPluginCollection::set	public	function	Stores an initialized plugin.

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class DefaultLazyPluginCollection in Plug 7

Hierarchy

File

Namespace

Members

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