--- /dev/null
+<?php
+
+namespace Drupal\devel;
+
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Plugin\DefaultPluginManager;
+use Drupal\devel\Annotation\DevelDumper;
+
+/**
+ * Plugin type manager for Devel Dumper plugins.
+ *
+ * @see \Drupal\devel\Annotation\DevelDumper
+ * @see \Drupal\devel\DevelDumperInterface
+ * @see \Drupal\devel\DevelDumperBase
+ * @see plugin_api
+ */
+class DevelDumperPluginManager extends DefaultPluginManager implements DevelDumperPluginManagerInterface {
+
+ /**
+ * Constructs a DevelDumperPluginManager object.
+ *
+ * @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/Devel/Dumper', $namespaces, $module_handler, DevelDumperInterface::class, DevelDumper::class);
+ $this->setCacheBackend($cache_backend, 'devel_dumper_plugins');
+ $this->alterInfo('devel_dumper_info');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function processDefinition(&$definition, $plugin_id) {
+ parent::processDefinition($definition, $plugin_id);
+
+ $definition['supported'] = (bool) call_user_func([$definition['class'], 'checkRequirements']);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function isPluginSupported($plugin_id) {
+ $definition = $this->getDefinition($plugin_id, FALSE);
+ return $definition && $definition['supported'];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function createInstance($plugin_id, array $configuration = []) {
+ if (!$this->isPluginSupported($plugin_id)) {
+ $plugin_id = $this->getFallbackPluginId($plugin_id);
+ }
+ return parent::createInstance($plugin_id, $configuration);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFallbackPluginId($plugin_id, array $configuration = []) {
+ return 'default';
+ }
+
+}