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<?php |
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namespace Drupal\graphql\Plugin\GraphQL\Schemas; |
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use Drupal\Component\Plugin\PluginBase; |
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use Drupal\Core\Plugin\ContainerFactoryPluginInterface; |
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use Drupal\graphql\GraphQL\Schema\Schema; |
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use Drupal\graphql\Plugin\GraphQL\PluggableSchemaBuilder; |
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use Drupal\graphql\Plugin\GraphQL\PluggableSchemaPluginInterface; |
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use Drupal\graphql\Plugin\GraphQL\TypeSystemPluginInterface; |
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use Drupal\graphql\Plugin\GraphQL\TypeSystemPluginManagerAggregator; |
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use Symfony\Component\DependencyInjection\ContainerInterface; |
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use Youshido\GraphQL\Schema\InternalSchemaMutationObject; |
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use Youshido\GraphQL\Schema\InternalSchemaQueryObject; |
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abstract class SchemaPluginBase extends PluginBase implements PluggableSchemaPluginInterface, ContainerFactoryPluginInterface { |
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/** |
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* The schema builder object. |
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* |
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* @var \Drupal\graphql\Plugin\GraphQL\PluggableSchemaBuilderInterface |
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*/ |
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protected $schemaBuilder; |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) { |
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return new static( |
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$configuration, |
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$plugin_id, |
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$plugin_definition, |
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$container->get('graphql.plugin_manager_aggregator') |
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); |
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} |
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/** |
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* SchemaPluginBase constructor. |
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* |
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* @param array $configuration |
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* The plugin configuration array. |
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* @param string $pluginId |
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* The plugin id. |
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* @param array $pluginDefinition |
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* The plugin definition array. |
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* @param \Drupal\graphql\Plugin\GraphQL\TypeSystemPluginManagerAggregator $pluginManagers |
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* Type system plugin manager aggregator service. |
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*/ |
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public function __construct($configuration, $pluginId, $pluginDefinition, TypeSystemPluginManagerAggregator $pluginManagers) { |
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parent::__construct($configuration, $pluginId, $pluginDefinition); |
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$this->schemaBuilder = new PluggableSchemaBuilder($pluginManagers); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getSchemaBuilder() { |
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return $this->schemaBuilder; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getSchema() { |
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$mutation = new InternalSchemaMutationObject(['name' => 'RootMutation']); |
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$mutation->addFields($this->extractDefinitions(($this->getMutations()))); |
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$query = new InternalSchemaQueryObject(['name' => 'RootQuery']); |
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$query->addFields($this->extractDefinitions($this->getRootFields())); |
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$types = $this->extractDefinitions($this->getTypes()); |
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return new Schema($this, [ |
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'query' => $query, |
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'mutation' => $mutation, |
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'types' => $types, |
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]); |
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} |
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/** |
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* Extract type or field definitions from plugins. |
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* |
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* @param array $plugins |
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* The list of plugins to extract the type or field definitions from. |
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* |
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* @return array |
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* The list of extracted type or field definitions. |
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*/ |
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protected function extractDefinitions(array $plugins) { |
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return array_map(function (TypeSystemPluginInterface $plugin) { |
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return $plugin->getDefinition($this->schemaBuilder); |
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}, $plugins); |
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} |
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/** |
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* Retrieve all mutations. |
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* |
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* @return \Drupal\graphql\Plugin\GraphQL\TypeSystemPluginInterface[] |
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* The list of mutation plugins. |
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*/ |
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protected function getMutations() { |
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return $this->schemaBuilder->find(function() { |
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return TRUE; |
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}, [GRAPHQL_MUTATION_PLUGIN]); |
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} |
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/** |
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* Retrieve all fields that are not associated with a specific type. |
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* |
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* @return \Drupal\graphql\Plugin\GraphQL\TypeSystemPluginInterface[] |
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* The list root field plugins. |
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*/ |
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protected function getRootFields() { |
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// Retrieve the list of fields that are not attached to any type or are |
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// explicitly attached to the artificial "Root" type. |
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return $this->schemaBuilder->find(function($definition) { |
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return empty($definition['parents']) || in_array('Root', $definition['parents']); |
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}, [GRAPHQL_FIELD_PLUGIN]); |
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} |
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/** |
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* Retrieve all types to be registered explicitly. |
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* |
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* @return \Drupal\graphql\Plugin\GraphQL\TypeSystemPluginInterface[] |
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* The list of types to be registered explicitly. |
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*/ |
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protected function getTypes() { |
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return $this->schemaBuilder->find(function() { |
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return TRUE; |
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}, [ |
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GRAPHQL_UNION_TYPE_PLUGIN, |
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GRAPHQL_TYPE_PLUGIN, |
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GRAPHQL_INPUT_TYPE_PLUGIN, |
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]); |
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} |
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} |
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.