class DefaultSingleLazyPluginCollection in Drupal 8

Provides a default plugin collection for a plugin type.

A plugin collection usually stores multiple plugins, and is used to lazily instantiate them. When only one plugin is needed, it is still best practice to encapsulate all of the instantiation logic in a plugin collection. This class can be used directly, or subclassed to add further exception handling in self::initializePlugin().

Hierarchy

• class \Drupal\Component\Plugin\LazyPluginCollection implements \Drupal\Component\Plugin\IteratorAggregate, \Drupal\Component\Plugin\Countable
  • class \Drupal\Core\Plugin\DefaultSingleLazyPluginCollection uses DependencySerializationTrait

7 files declare their use of DefaultSingleLazyPluginCollection

ActionPluginCollection.php in core/lib/Drupal/Core/Action/ActionPluginCollection.php

BlockPluginCollection.php in core/modules/block/src/BlockPluginCollection.php

DefaultSingleLazyPluginCollectionTest.php in core/tests/Drupal/Tests/Core/Plugin/DefaultSingleLazyPluginCollectionTest.php

MediaType.php in core/modules/media/src/Entity/MediaType.php

RestResourceConfig.php in core/modules/rest/src/Entity/RestResourceConfig.php

... See full list

File

core/lib/Drupal/Core/Plugin/DefaultSingleLazyPluginCollection.php, line 19

Namespace

Drupal\Core\Plugin

class DefaultSingleLazyPluginCollection extends LazyPluginCollection {
  use DependencySerializationTrait;

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

  /**
   * An array of configuration to instantiate the plugin with.
   *
   * @var array
   */
  protected $configuration;

  /**
   * The instance ID used for this plugin collection.
   *
   * @var string
   */
  protected $instanceId;

  /**
   * Constructs a new DefaultSingleLazyPluginCollection object.
   *
   * @param \Drupal\Component\Plugin\PluginManagerInterface $manager
   *   The manager to be used for instantiating plugins.
   * @param string $instance_id
   *   The ID of the plugin instance.
   * @param array $configuration
   *   An array of configuration.
   */
  public function __construct(PluginManagerInterface $manager, $instance_id, array $configuration) {
    $this->manager = $manager;
    $this
      ->addInstanceId($instance_id, $configuration);
  }

  /**
   * {@inheritdoc}
   */
  protected function initializePlugin($instance_id) {
    $this
      ->set($instance_id, $this->manager
      ->createInstance($instance_id, $this->configuration));
  }

  /**
   * {@inheritdoc}
   */
  public function getConfiguration() {
    $plugin = $this
      ->get($this->instanceId);
    if (PluginHelper::isConfigurable($plugin)) {
      return $plugin
        ->getConfiguration();
    }
    else {
      return $this->configuration;
    }
  }

  /**
   * {@inheritdoc}
   */
  public function setConfiguration($configuration) {
    $this->configuration = $configuration;
    $plugin = $this
      ->get($this->instanceId);
    if (PluginHelper::isConfigurable($plugin)) {
      $plugin
        ->setConfiguration($configuration);
    }
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function addInstanceId($id, $configuration = NULL) {
    $this->instanceId = $id;

    // Reset the list of instance IDs since there can be only one.
    $this->instanceIds = [];
    parent::addInstanceId($id, $configuration);
    if ($configuration !== NULL) {
      $this
        ->setConfiguration($configuration);
    }
  }

}

Members

Name	Modifiers	Type	Description	Overrides
DefaultSingleLazyPluginCollection::$configuration	protected	property	An array of configuration to instantiate the plugin with.
DefaultSingleLazyPluginCollection::$instanceId	protected	property	The instance ID used for this plugin collection.
DefaultSingleLazyPluginCollection::$manager	protected	property	The manager used to instantiate the plugins.
DefaultSingleLazyPluginCollection::addInstanceId	public	function	Adds an instance ID to the available instance IDs. Overrides LazyPluginCollection::addInstanceId
DefaultSingleLazyPluginCollection::getConfiguration	public	function	Gets the current configuration of all plugins in this collection. Overrides LazyPluginCollection::getConfiguration
DefaultSingleLazyPluginCollection::initializePlugin	protected	function	Initializes and stores a plugin. Overrides LazyPluginCollection::initializePlugin	1
DefaultSingleLazyPluginCollection::setConfiguration	public	function	Sets the configuration for all plugins in this collection. Overrides LazyPluginCollection::setConfiguration
DefaultSingleLazyPluginCollection::__construct	public	function	Constructs a new DefaultSingleLazyPluginCollection object.	1
DependencySerializationTrait::$_entityStorages	protected	property	An array of entity type IDs keyed by the property name of their storages.
DependencySerializationTrait::$_serviceIds	protected	property	An array of service IDs keyed by property name used for serialization.
DependencySerializationTrait::__sleep	public	function		1
DependencySerializationTrait::__wakeup	public	function		2
LazyPluginCollection::$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.	4
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::removeInstanceId	public	function	Removes an instance ID.
LazyPluginCollection::set	public	function	Stores an initialized plugin.