diff core/modules/migrate/src/Plugin/MigrationPluginManager.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/migrate/src/Plugin/MigrationPluginManager.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,261 @@
+<?php
+
+namespace Drupal\migrate\Plugin;
+
+use Drupal\Component\Graph\Graph;
+use Drupal\Component\Plugin\PluginBase;
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\Core\Plugin\DefaultPluginManager;
+use Drupal\Core\Plugin\Discovery\ContainerDerivativeDiscoveryDecorator;
+use Drupal\migrate\Plugin\Discovery\ProviderFilterDecorator;
+use Drupal\Core\Plugin\Discovery\YamlDirectoryDiscovery;
+use Drupal\Core\Plugin\Factory\ContainerFactory;
+use Drupal\migrate\MigrateBuildDependencyInterface;
+
+/**
+ * Plugin manager for migration plugins.
+ */
+class MigrationPluginManager extends DefaultPluginManager implements MigrationPluginManagerInterface, MigrateBuildDependencyInterface {
+
+  /**
+   * Provides default values for migrations.
+   *
+   * @var array
+   */
+  protected $defaults = [
+    'class' => '\Drupal\migrate\Plugin\Migration',
+  ];
+
+  /**
+   * The interface the plugins should implement.
+   *
+   * @var string
+   */
+  protected $pluginInterface = 'Drupal\migrate\Plugin\MigrationInterface';
+
+  /**
+   * The module handler.
+   *
+   * @var \Drupal\Core\Extension\ModuleHandlerInterface
+   */
+  protected $moduleHandler;
+
+  /**
+   * Construct a migration plugin manager.
+   *
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler.
+   * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
+   *   The cache backend for the definitions.
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   The language manager.
+   */
+  public function __construct(ModuleHandlerInterface $module_handler, CacheBackendInterface $cache_backend, LanguageManagerInterface $language_manager) {
+    $this->factory = new ContainerFactory($this, $this->pluginInterface);
+    $this->alterInfo('migration_plugins');
+    $this->setCacheBackend($cache_backend, 'migration_plugins', ['migration_plugins']);
+    $this->moduleHandler = $module_handler;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getDiscovery() {
+    if (!isset($this->discovery)) {
+      $directories = array_map(function ($directory) {
+        return [$directory . '/migration_templates', $directory . '/migrations'];
+      }, $this->moduleHandler->getModuleDirectories());
+
+      $yaml_discovery = new YamlDirectoryDiscovery($directories, 'migrate');
+      // This gets rid of migrations which try to use a non-existent source
+      // plugin. The common case for this is if the source plugin has, or
+      // specifies, a non-existent provider.
+      $only_with_source_discovery  = new NoSourcePluginDecorator($yaml_discovery);
+      // This gets rid of migrations with explicit providers set if one of the
+      // providers do not exist before we try to use a potentially non-existing
+      // deriver. This is a rare case.
+      $filtered_discovery = new ProviderFilterDecorator($only_with_source_discovery, [$this->moduleHandler, 'moduleExists']);
+      $this->discovery = new ContainerDerivativeDiscoveryDecorator($filtered_discovery);
+    }
+    return $this->discovery;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function createInstance($plugin_id, array $configuration = []) {
+    $instances = $this->createInstances([$plugin_id], [$plugin_id => $configuration]);
+    return reset($instances);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function createInstances($migration_id, array $configuration = []) {
+    if (empty($migration_id)) {
+      $migration_id = array_keys($this->getDefinitions());
+    }
+
+    $factory = $this->getFactory();
+    $migration_ids = (array) $migration_id;
+    $plugin_ids = $this->expandPluginIds($migration_ids);
+
+    $instances = [];
+    foreach ($plugin_ids as $plugin_id) {
+      $instances[$plugin_id] = $factory->createInstance($plugin_id, isset($configuration[$plugin_id]) ? $configuration[$plugin_id] : []);
+    }
+
+    foreach ($instances as $migration) {
+      $migration->set('migration_dependencies', array_map([$this, 'expandPluginIds'], $migration->getMigrationDependencies()));
+    }
+
+    // Sort the migrations based on their dependencies.
+    return $this->buildDependencyMigration($instances, []);
+  }
+
+  /**
+   * Create migrations given a tag.
+   *
+   * @param string $tag
+   *   A migration tag we want to filter by.
+   *
+   * @return array|\Drupal\migrate\Plugin\MigrationInterface[]
+   *   An array of migration objects with the given tag.
+   */
+  public function createInstancesByTag($tag) {
+    $migrations = array_filter($this->getDefinitions(), function ($migration) use ($tag) {
+      return !empty($migration['migration_tags']) && in_array($tag, $migration['migration_tags']);
+    });
+    return $this->createInstances(array_keys($migrations));
+  }
+
+  /**
+   * Expand derivative migration dependencies.
+   *
+   * We need to expand any derivative migrations. Derivative migrations are
+   * calculated by migration derivers such as D6NodeDeriver. This allows
+   * migrations to depend on the base id and then have a dependency on all
+   * derivative migrations. For example, d6_comment depends on d6_node but after
+   * we've expanded the dependencies it will depend on d6_node:page,
+   * d6_node:story and so on, for other derivative migrations.
+   *
+   * @return array
+   *   An array of expanded plugin ids.
+   */
+  protected function expandPluginIds(array $migration_ids) {
+    $plugin_ids = [];
+    foreach ($migration_ids as $id) {
+      $plugin_ids += preg_grep('/^' . preg_quote($id, '/') . PluginBase::DERIVATIVE_SEPARATOR . '/', array_keys($this->getDefinitions()));
+      if ($this->hasDefinition($id)) {
+        $plugin_ids[] = $id;
+      }
+    }
+    return $plugin_ids;
+  }
+
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildDependencyMigration(array $migrations, array $dynamic_ids) {
+    // Migration dependencies can be optional or required. If an optional
+    // dependency does not run, the current migration is still OK to go. Both
+    // optional and required dependencies (if run at all) must run before the
+    // current migration.
+    $dependency_graph = [];
+    $required_dependency_graph = [];
+    $have_optional = FALSE;
+    foreach ($migrations as $migration) {
+      /** @var \Drupal\migrate\Plugin\MigrationInterface $migration */
+      $id = $migration->id();
+      $requirements[$id] = [];
+      $dependency_graph[$id]['edges'] = [];
+      $migration_dependencies = $migration->getMigrationDependencies();
+
+      if (isset($migration_dependencies['required'])) {
+        foreach ($migration_dependencies['required'] as $dependency) {
+          if (!isset($dynamic_ids[$dependency])) {
+            $this->addDependency($required_dependency_graph, $id, $dependency, $dynamic_ids);
+          }
+          $this->addDependency($dependency_graph, $id, $dependency, $dynamic_ids);
+        }
+      }
+      if (!empty($migration_dependencies['optional'])) {
+        foreach ($migration_dependencies['optional'] as $dependency) {
+          $this->addDependency($dependency_graph, $id, $dependency, $dynamic_ids);
+        }
+        $have_optional = TRUE;
+      }
+    }
+    $dependency_graph = (new Graph($dependency_graph))->searchAndSort();
+    if ($have_optional) {
+      $required_dependency_graph = (new Graph($required_dependency_graph))->searchAndSort();
+    }
+    else {
+      $required_dependency_graph = $dependency_graph;
+    }
+    $weights = [];
+    foreach ($migrations as $migration_id => $migration) {
+      // Populate a weights array to use with array_multisort() later.
+      $weights[] = $dependency_graph[$migration_id]['weight'];
+      if (!empty($required_dependency_graph[$migration_id]['paths'])) {
+        $migration->set('requirements', $required_dependency_graph[$migration_id]['paths']);
+      }
+    }
+    array_multisort($weights, SORT_DESC, SORT_NUMERIC, $migrations);
+
+    return $migrations;
+  }
+
+  /**
+   * Add one or more dependencies to a graph.
+   *
+   * @param array $graph
+   *   The graph so far, passed by reference.
+   * @param int $id
+   *   The migration ID.
+   * @param string $dependency
+   *   The dependency string.
+   * @param array $dynamic_ids
+   *   The dynamic ID mapping.
+   */
+  protected function addDependency(array &$graph, $id, $dependency, $dynamic_ids) {
+    $dependencies = isset($dynamic_ids[$dependency]) ? $dynamic_ids[$dependency] : [$dependency];
+    if (!isset($graph[$id]['edges'])) {
+      $graph[$id]['edges'] = [];
+    }
+    $graph[$id]['edges'] += array_combine($dependencies, $dependencies);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function createStubMigration(array $definition) {
+    $id = isset($definition['id']) ? $definition['id'] : uniqid();
+    return Migration::create(\Drupal::getContainer(), [], $id, $definition);
+  }
+
+  /**
+   * Finds plugin definitions.
+   *
+   * @return array
+   *   List of definitions to store in cache.
+   *
+   * @todo This is a temporary solution to the fact that migration source
+   *   plugins have more than one provider. This functionality will be moved to
+   *   core in https://www.drupal.org/node/2786355.
+   */
+  protected function findDefinitions() {
+    $definitions = $this->getDiscovery()->getDefinitions();
+    foreach ($definitions as $plugin_id => &$definition) {
+      $this->processDefinition($definition, $plugin_id);
+    }
+    $this->alterDefinitions($definitions);
+    return ProviderFilterDecorator::filterDefinitions($definitions, function ($provider) {
+      return $this->providerExists($provider);
+    });
+  }
+
+}