--- /dev/null
+<?php
+
+namespace Drupal\libraries\Plugin\libraries\VersionDetector;
+
+use Drupal\Core\Plugin\PluginBase;
+use Drupal\libraries\ExternalLibrary\Exception\UnknownLibraryVersionException;
+use Drupal\libraries\ExternalLibrary\Version\VersionDetectorInterface;
+use Drupal\libraries\ExternalLibrary\Version\VersionedLibraryInterface;
+
+/**
+ * Detects the version by returning a static string.
+ *
+ * As this does not perform any actual detection and, thus, circumvents any
+ * negotiation of versions by Libraries API it should only be used for testing
+ * or when the version of a library cannot be determined from the source code
+ * itself.
+ *
+ * @VersionDetector("static")
+ */
+class StaticDetector extends PluginBase implements VersionDetectorInterface {
+
+ /**
+ * Constructs a static version detector.
+ *
+ * @param array $configuration
+ * @param string $plugin_id
+ * @param array $plugin_definition
+ */
+ public function __construct(array $configuration, $plugin_id, array $plugin_definition) {
+ $configuration += [
+ 'version' => NULL,
+ ];
+ parent::__construct($configuration, $plugin_id, $plugin_definition);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function detectVersion(VersionedLibraryInterface $library) {
+ if (!isset($this->configuration['version'])) {
+ throw new UnknownLibraryVersionException($library);
+ }
+ $library->setVersion($this->configuration['version']);
+ }
+
+}