MockBlockManager.php

<?php

/**
 * @file
 * Definition of Drupal\plugin_test\Plugin\MockBlockManager.
 */
namespace Drupal\plugin_test\Plugin;

use Drupal\Component\Plugin\PluginManagerBase;
use Drupal\Component\Plugin\Discovery\StaticDiscovery;
use Drupal\Component\Plugin\Discovery\DerivativeDiscoveryDecorator;
use Drupal\Component\Plugin\Factory\ReflectionFactory;

/**
 * Defines a plugin manager used by Plugin API derivative unit tests.
 */
class MockBlockManager extends PluginManagerBase {
  public function __construct() {

    // Create the object that can be used to return definitions for all the
    // plugins available for this type. Most real plugin managers use a richer
    // discovery implementation, but StaticDiscovery lets us add some simple
    // mock plugins for unit testing.
    $this->discovery = new StaticDiscovery();

    // Derivative plugins are plugins that are derived from a base plugin
    // definition and some site configuration (examples below). To allow for
    // such plugins, we add the DerivativeDiscoveryDecorator to our discovery
    // object.
    $this->discovery = new DerivativeDiscoveryDecorator($this->discovery);

    // The plugin definitions that follow are based on work that is in progress
    // for the Drupal 8 Blocks and Layouts initiative
    // (http://groups.drupal.org/node/213563). As stated above, we set
    // definitions here, because this is for unit testing. Real plugin managers
    // use a discovery implementation that allows for any module to add new
    // plugins to the system.
    // A simple plugin: the user login block.
    $this->discovery
      ->setDefinition('user_login', array(
      'label' => 'User login',
      'class' => 'Drupal\\plugin_test\\Plugin\\plugin_test\\mock_block\\MockUserLoginBlock',
    ));

    // A plugin that requires derivatives: the menu block plugin. We do not want
    // a generic "Menu" block showing up in the Block administration UI.
    // Instead, we want a block for each menu, but the number of menus in the
    // system and each one's title is user configurable. The
    // MockMenuBlockDeriver class ensures that only derivatives, and not the
    // base plugin, are available to the system.
    $this->discovery
      ->setDefinition('menu', array(
      'class' => 'Drupal\\plugin_test\\Plugin\\plugin_test\\mock_block\\MockMenuBlock',
      'derivative' => 'Drupal\\plugin_test\\Plugin\\plugin_test\\mock_block\\MockMenuBlockDeriver',
    ));

    // A block plugin that can optionally be derived: the layout block plugin.
    // A layout is a special kind of block into which other blocks can be
    // placed. We want both a generic "Layout" block available in the Block
    // administration UI as well as additional user-created custom layouts. The
    // MockLayoutBlockDeriver class ensures that both the base plugin and the
    // derivatives are available to the system.
    $this->discovery
      ->setDefinition('layout', array(
      'label' => 'Layout',
      'class' => 'Drupal\\plugin_test\\Plugin\\plugin_test\\mock_block\\MockLayoutBlock',
      'derivative' => 'Drupal\\plugin_test\\Plugin\\plugin_test\\mock_block\\MockLayoutBlockDeriver',
    ));

    // In addition to finding all of the plugins available for a type, a plugin
    // type must also be able to create instances of that plugin. For example, a
    // specific instance of a "Main menu" menu block, configured to show just
    // the top-level of links. To handle plugin instantiation, plugin managers
    // can use one of the factory classes included with the plugin system, or
    // create their own. ReflectionFactory is a general purpose, flexible
    // factory suitable for many kinds of plugin types. Factories need access to
    // the plugin definitions (e.g., since that's where the plugin's class is
    // specified), so we provide it the discovery object.
    $this->factory = new ReflectionFactory($this->discovery);
  }

}