Version 1

[yaffs-website] / web / core / lib / Drupal / Core / Plugin / Context / LazyContextRepository.php

diff --git a/web/core/lib/Drupal/Core/Plugin/Context/LazyContextRepository.php b/web/core/lib/Drupal/Core/Plugin/Context/LazyContextRepository.php
new file mode 100644 (file)
index 0000000..d805354
--- /dev/null
+++ b/web/core/lib/Drupal/Core/Plugin/Context/LazyContextRepository.php
@@ -0,0 +1,107 @@
+<?php
+
+namespace Drupal\Core\Plugin\Context;
+
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a context repository which uses context provider services.
+ */
+class LazyContextRepository implements ContextRepositoryInterface {
+
+  /**
+   * The set of available context providers service IDs.
+   *
+   * @var string[]
+   *   Context provider service IDs.
+   */
+  protected $contextProviderServiceIDs = [];
+
+  /**
+   * The service container.
+   *
+   * @var \Symfony\Component\DependencyInjection\ContainerInterface
+   */
+  protected $container;
+
+  /**
+   * The statically cached contexts.
+   *
+   * @var \Drupal\Core\Plugin\Context\ContextInterface[]
+   */
+  protected $contexts = [];
+
+  /**
+   * Constructs a LazyContextRepository object.
+   *
+   * @param \Symfony\Component\DependencyInjection\ContainerInterface $container
+   *   The current service container.
+   * @param string[] $context_provider_service_ids
+   *   The set of the available context provider service IDs.
+   */
+  public function __construct(ContainerInterface $container, array $context_provider_service_ids) {
+    $this->container = $container;
+    $this->contextProviderServiceIDs = $context_provider_service_ids;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getRuntimeContexts(array $context_ids) {
+    $contexts = [];
+
+    // Create a map of context providers (service IDs) to unqualified context
+    // IDs.
+    $context_ids_by_service = [];
+    foreach ($context_ids as $id) {
+      if (isset($this->contexts[$id])) {
+        $contexts[$id] = $this->contexts[$id];
+        continue;
+      }
+      // The IDs have been passed in @{service_id}:{unqualified_context_id}
+      // format.
+      // @todo Convert to an assert once https://www.drupal.org/node/2408013 is
+      //   in.
+      if ($id[0] === '@' && strpos($id, ':') !== FALSE) {
+        list($service_id, $unqualified_context_id) = explode(':', $id, 2);
+        // Remove the leading '@'.
+        $service_id = substr($service_id, 1);
+      }
+      else {
+        throw new \InvalidArgumentException('You must provide the context IDs in the @{service_id}:{unqualified_context_id} format.');
+      }
+      $context_ids_by_service[$service_id][] = $unqualified_context_id;
+    }
+
+    // Iterate over all missing context providers (services), gather the
+    // runtime contexts and assign them as requested.
+    foreach ($context_ids_by_service as $service_id => $unqualified_context_ids) {
+      $contexts_by_service = $this->container->get($service_id)->getRuntimeContexts($unqualified_context_ids);
+
+      $wanted_contexts = array_intersect_key($contexts_by_service, array_flip($unqualified_context_ids));
+      foreach ($wanted_contexts as $unqualified_context_id => $context) {
+        $context_id = '@' . $service_id . ':' . $unqualified_context_id;
+        $this->contexts[$context_id] = $contexts[$context_id] = $context;
+      }
+    }
+
+    return $contexts;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getAvailableContexts() {
+    $contexts = [];
+    foreach ($this->contextProviderServiceIDs as $service_id) {
+      $contexts_by_service = $this->container->get($service_id)->getAvailableContexts();
+      foreach ($contexts_by_service as $unqualified_context_id => $context) {
+        $context_id = '@' . $service_id . ':' . $unqualified_context_id;
+        $contexts[$context_id] = $context;
+      }
+    }
+
+    return $contexts;
+  }
+
+}