--- /dev/null
+<?php
+
+namespace Drupal\entity_embed\EntityEmbedDisplay;
+
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Plugin\DefaultPluginManager;
+use Drupal\Component\Plugin\Exception\PluginException;
+
+/**
+ * Provides an Entity Embed display plugin manager.
+ *
+ * @see \Drupal\entity_embed\Annotation\EntityEmbedDisplay
+ * @see \Drupal\entity_embed\EntityEmbedDisplay\EntityEmbedDisplayBase
+ * @see \Drupal\entity_embed\EntityEmbedDisplay\EntityEmbedDisplayInterface
+ * @see plugin_api
+ */
+class EntityEmbedDisplayManager extends DefaultPluginManager {
+
+ /**
+ * Constructs a new EntityEmbedDisplayManager.
+ *
+ * @param \Traversable $namespaces
+ * An object that implements \Traversable which contains the root paths
+ * keyed by the corresponding namespace to look for plugin implementations.
+ * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
+ * Cache backend instance to use.
+ * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+ * The module handler to invoke the alter hook with.
+ */
+ public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler) {
+ parent::__construct('Plugin/entity_embed/EntityEmbedDisplay', $namespaces, $module_handler, 'Drupal\entity_embed\EntityEmbedDisplay\EntityEmbedDisplayInterface', 'Drupal\entity_embed\Annotation\EntityEmbedDisplay');
+ $this->alterInfo('entity_embed_display_plugins');
+ $this->setCacheBackend($cache_backend, 'entity_embed_display_plugins');
+ }
+
+ /**
+ * Overrides DefaultPluginManager::processDefinition().
+ */
+ public function processDefinition(&$definition, $plugin_id) {
+ $definition += array(
+ 'entity_types' => FALSE,
+ );
+
+ if ($definition['entity_types'] !== FALSE && !is_array($definition['entity_types'])) {
+ $definition['entity_types'] = array($definition['entity_types']);
+ }
+ }
+
+ /**
+ * Determines plugins whose constraints are satisfied by a set of contexts.
+ *
+ * @param array $contexts
+ * An array of contexts.
+ *
+ * @return array
+ * An array of plugin definitions.
+ *
+ * @todo At some point convert this to use ContextAwarePluginManagerTrait
+ *
+ * @see https://drupal.org/node/2277981
+ */
+ public function getDefinitionsForContexts(array $contexts = array()) {
+ $definitions = $this->getDefinitions();
+ $valid_ids = array_filter(array_keys($definitions), function ($id) use ($contexts) {
+ try {
+ $display = $this->createInstance($id);
+ foreach ($contexts as $name => $value) {
+ $display->setContextValue($name, $value);
+ }
+ // We lose cacheability metadata at this point. We should refactor to
+ // avoid this. @see https://www.drupal.org/node/2593379#comment-11368447
+ return $display->access()->isAllowed();
+ }
+ catch (PluginException $e) {
+ return FALSE;
+ }
+ });
+ $definitions_for_context = array_intersect_key($definitions, array_flip($valid_ids));
+ $this->moduleHandler->alter('entity_embed_display_plugins_for_context', $definitions_for_context, $contexts);
+ return $definitions_for_context;
+ }
+
+ /**
+ * Gets definition options for entity.
+ *
+ * Provides a list of plugins that can be used for a certain entity and
+ * filters out plugins that should be hidden in the UI.
+ *
+ * @param \Drupal\Core\Entity\EntityInterface $entity
+ * An entity object.
+ *
+ * @return array
+ * An array of valid plugin labels, keyed by plugin ID.
+ */
+ public function getDefinitionOptionsForEntity(EntityInterface $entity) {
+ $definitions = $this->getDefinitionsForContexts(array('entity' => $entity, 'entity_type' => $entity->getEntityTypeId()));
+ $definitions = $this->filterExposedDefinitions($definitions);
+ return array_map(function ($definition) {
+ return (string) $definition['label'];
+ }, $definitions);
+ }
+
+ /**
+ * Filters out plugins from definitions that should be hidden in the UI.
+ *
+ * @param array $definitions
+ * The array of plugin definitions.
+ *
+ * @return array
+ * Returns plugin definitions that should be displayed in the UI.
+ */
+ protected function filterExposedDefinitions(array $definitions) {
+ return array_filter($definitions, function($definition) {
+ return empty($definition['no_ui']);
+ });
+ }
+
+ /**
+ * Gets definition options for entity type.
+ *
+ * Provides a list of plugins that can be used for a certain entity type and
+ * filters out plugins that should be hidden in the UI.
+ *
+ * @param string $entity_type
+ * The entity type id.
+ *
+ * @return array
+ * An array of valid plugin labels, keyed by plugin ID.
+ */
+ public function getDefinitionOptionsForEntityType($entity_type) {
+ $definitions = $this->getDefinitionsForContexts(array('entity_type' => $entity_type));
+ $definitions = $this->filterExposedDefinitions($definitions);
+ return array_map(function ($definition) {
+ return (string) $definition['label'];
+ }, $definitions);
+ }
+
+}