ContextDefinition.php in Drupal 8

Namespace

Drupal\Core\Plugin\Context

File

core/lib/Drupal/Core/Plugin/Context/ContextDefinition.php

<?php

namespace Drupal\Core\Plugin\Context;

use Drupal\Core\DependencyInjection\DependencySerializationTrait;
use Drupal\Core\TypedData\TypedDataTrait;

/**
 * Defines a class for context definitions.
 */
class ContextDefinition implements ContextDefinitionInterface {
  use DependencySerializationTrait {
    __sleep as traitSleep;
  }
  use TypedDataTrait;

  /**
   * The data type of the data.
   *
   * @var string
   *   The data type.
   */
  protected $dataType;

  /**
   * The human-readable label.
   *
   * @var string
   *   The label.
   */
  protected $label;

  /**
   * The human-readable description.
   *
   * @var string|null
   *   The description, or NULL if no description is available.
   */
  protected $description;

  /**
   * Whether the data is multi-valued, i.e. a list of data items.
   *
   * @var bool
   */
  protected $isMultiple = FALSE;

  /**
   * Determines whether a data value is required.
   *
   * @var bool
   *   Whether a data value is required.
   */
  protected $isRequired = TRUE;

  /**
   * The default value.
   *
   * @var mixed
   */
  protected $defaultValue;

  /**
   * An array of constraints.
   *
   * @var array[]
   */
  protected $constraints = [];

  /**
   * An EntityContextDefinition instance, for backwards compatibility.
   *
   * If this context is created with a data type that starts with 'entity:',
   * this property will be an instance of EntityContextDefinition, and certain
   * methods of this object will delegate to their overridden counterparts in
   * $this->entityContextDefinition.
   *
   * This property should be kept private so that it is only accessible to this
   * class for backwards compatibility reasons. It will be removed in Drupal 9.
   *
   * @deprecated
   *   Constructing a context definition for an entity type (i.e., the data type
   *   begins with 'entity:') is deprecated in Drupal 8.6.0. Instead, use
   *   the static factory methods of EntityContextDefinition to create context
   *   definitions for entity types, or the static ::create() method of this
   *   class for any other data type. See https://www.drupal.org/node/2976400
   *   for more information.
   *
   * @see ::__construct()
   * @see ::__sleep()
   * @see ::__wakeup()
   * @see ::getConstraintObjects()
   * @see ::getSampleValues()
   * @see ::initializeEntityContextDefinition()
   * @see https://www.drupal.org/node/2932462
   * @see https://www.drupal.org/node/2976400
   *
   * @var \Drupal\Core\Plugin\Context\EntityContextDefinition
   */
  private $entityContextDefinition;

  /**
   * Creates a new context definition.
   *
   * @param string $data_type
   *   The data type for which to create the context definition. Defaults to
   *   'any'.
   *
   * @return static
   *   The created context definition object.
   */
  public static function create($data_type = 'any') {
    return new static($data_type);
  }

  /**
   * Constructs a new context definition object.
   *
   * @param string $data_type
   *   The required data type.
   * @param string|null $label
   *   The label of this context definition for the UI.
   * @param bool $required
   *   Whether the context definition is required.
   * @param bool $multiple
   *   Whether the context definition is multivalue.
   * @param string|null $description
   *   The description of this context definition for the UI.
   * @param mixed $default_value
   *   The default value of this definition.
   */
  public function __construct($data_type = 'any', $label = NULL, $required = TRUE, $multiple = FALSE, $description = NULL, $default_value = NULL) {
    $this->dataType = $data_type;
    $this->label = $label;
    $this->isRequired = $required;
    $this->isMultiple = $multiple;
    $this->description = $description;
    $this->defaultValue = $default_value;
    if (strpos($data_type, 'entity:') === 0 && !$this instanceof EntityContextDefinition) {
      @trigger_error('Constructing a ContextDefinition object for an entity type is deprecated in Drupal 8.6.0. Use ' . __NAMESPACE__ . '\\EntityContextDefinition instead. See https://www.drupal.org/node/2976400 for more information.', E_USER_DEPRECATED);
      $this
        ->initializeEntityContextDefinition();
    }
  }

  /**
   * {@inheritdoc}
   */
  public function getDataType() {
    return $this->dataType;
  }

  /**
   * {@inheritdoc}
   */
  public function setDataType($data_type) {
    $this->dataType = $data_type;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function getLabel() {
    return $this->label;
  }

  /**
   * {@inheritdoc}
   */
  public function setLabel($label) {
    $this->label = $label;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function getDescription() {
    return $this->description;
  }

  /**
   * {@inheritdoc}
   */
  public function setDescription($description) {
    $this->description = $description;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function isMultiple() {
    return $this->isMultiple;
  }

  /**
   * {@inheritdoc}
   */
  public function setMultiple($multiple = TRUE) {
    $this->isMultiple = $multiple;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function isRequired() {
    return $this->isRequired;
  }

  /**
   * {@inheritdoc}
   */
  public function setRequired($required = TRUE) {
    $this->isRequired = $required;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function getDefaultValue() {
    return $this->defaultValue;
  }

  /**
   * {@inheritdoc}
   */
  public function setDefaultValue($default_value) {
    $this->defaultValue = $default_value;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function getConstraints() {

    // If the backwards compatibility layer is present, delegate to that.
    $this
      ->initializeEntityContextDefinition();
    if ($this->entityContextDefinition) {
      return $this->entityContextDefinition
        ->getConstraints();
    }

    // @todo Apply defaults.
    return $this->constraints;
  }

  /**
   * {@inheritdoc}
   */
  public function getConstraint($constraint_name) {

    // If the backwards compatibility layer is present, delegate to that.
    $this
      ->initializeEntityContextDefinition();
    if ($this->entityContextDefinition) {
      return $this->entityContextDefinition
        ->getConstraint($constraint_name);
    }
    $constraints = $this
      ->getConstraints();
    return isset($constraints[$constraint_name]) ? $constraints[$constraint_name] : NULL;
  }

  /**
   * {@inheritdoc}
   */
  public function setConstraints(array $constraints) {

    // If the backwards compatibility layer is present, delegate to that.
    $this
      ->initializeEntityContextDefinition();
    if ($this->entityContextDefinition) {
      $this->entityContextDefinition
        ->setConstraints($constraints);
    }
    $this->constraints = $constraints;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function addConstraint($constraint_name, $options = NULL) {

    // If the backwards compatibility layer is present, delegate to that.
    $this
      ->initializeEntityContextDefinition();
    if ($this->entityContextDefinition) {
      $this->entityContextDefinition
        ->addConstraint($constraint_name, $options);
    }
    $this->constraints[$constraint_name] = $options;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function getDataDefinition() {
    if ($this
      ->isMultiple()) {
      $definition = $this
        ->getTypedDataManager()
        ->createListDataDefinition($this
        ->getDataType());
    }
    else {
      $definition = $this
        ->getTypedDataManager()
        ->createDataDefinition($this
        ->getDataType());
    }
    if (!$definition) {
      throw new \Exception("The data type '{$this->getDataType()}' is invalid");
    }
    $definition
      ->setLabel($this
      ->getLabel())
      ->setDescription($this
      ->getDescription())
      ->setRequired($this
      ->isRequired());
    $constraints = $definition
      ->getConstraints() + $this
      ->getConstraints();
    $definition
      ->setConstraints($constraints);
    return $definition;
  }

  /**
   * Checks if this definition's data type matches that of the given context.
   *
   * @param \Drupal\Core\Plugin\Context\ContextInterface $context
   *   The context to test against.
   *
   * @return bool
   *   TRUE if the data types match, otherwise FALSE.
   */
  protected function dataTypeMatches(ContextInterface $context) {
    $this_type = $this
      ->getDataType();
    $that_type = $context
      ->getContextDefinition()
      ->getDataType();
    return $this_type === 'any' || $this_type === $that_type || strpos($that_type, "{$this_type}:") === 0;
  }

  /**
   * {@inheritdoc}
   */
  public function isSatisfiedBy(ContextInterface $context) {
    $definition = $context
      ->getContextDefinition();
    if (!$this
      ->dataTypeMatches($context)) {
      return FALSE;
    }

    // Get the value for this context, either directly if possible or by
    // introspecting the definition.
    if ($context
      ->hasContextValue()) {
      $values = [
        $context
          ->getContextData(),
      ];
    }
    elseif ($definition instanceof self) {
      $this
        ->initializeEntityContextDefinition();
      if ($this->entityContextDefinition) {
        $values = $this->entityContextDefinition
          ->getSampleValues();
      }
      else {
        $values = $definition
          ->getSampleValues();
      }
    }
    else {
      $values = [];
    }
    $validator = $this
      ->getTypedDataManager()
      ->getValidator();
    foreach ($values as $value) {
      $constraints = array_values($this
        ->getConstraintObjects());
      $violations = $validator
        ->validate($value, $constraints);
      foreach ($violations as $delta => $violation) {

        // Remove any violation that does not correspond to the constraints.
        if (!in_array($violation
          ->getConstraint(), $constraints)) {
          $violations
            ->remove($delta);
        }
      }

      // If a value has no violations then the requirement is satisfied.
      if (!$violations
        ->count()) {
        return TRUE;
      }
    }
    return FALSE;
  }

  /**
   * Returns typed data objects representing this context definition.
   *
   * This should return as many objects as needed to reflect the variations of
   * the constraints it supports.
   *
   * @yield \Drupal\Core\TypedData\TypedDataInterface
   *   The set of typed data object.
   */
  protected function getSampleValues() {
    (yield $this
      ->getTypedDataManager()
      ->create($this
      ->getDataDefinition()));
  }

  /**
   * Extracts an array of constraints for a context definition object.
   *
   * @return \Symfony\Component\Validator\Constraint[]
   *   A list of applied constraints for the context definition.
   */
  protected function getConstraintObjects() {

    // If the backwards compatibility layer is present, delegate to that.
    $this
      ->initializeEntityContextDefinition();
    if ($this->entityContextDefinition) {
      return $this->entityContextDefinition
        ->getConstraintObjects();
    }
    $constraint_definitions = $this
      ->getConstraints();
    $validation_constraint_manager = $this
      ->getTypedDataManager()
      ->getValidationConstraintManager();
    $constraints = [];
    foreach ($constraint_definitions as $constraint_name => $constraint_definition) {
      $constraints[$constraint_name] = $validation_constraint_manager
        ->create($constraint_name, $constraint_definition);
    }
    return $constraints;
  }

  /**
   * Implements magic __sleep() method.
   */
  public function __sleep() {
    return array_diff($this
      ->traitSleep(), [
      'entityContextDefinition',
    ]);
  }

  /**
   * Initializes $this->entityContextDefinition for backwards compatibility.
   *
   * This method should be kept private so that it is only accessible to this
   * class for backwards compatibility reasons. It will be removed in Drupal 9.
   *
   * @deprecated
   */
  private function initializeEntityContextDefinition() {
    if (!$this instanceof EntityContextDefinition && strpos($this
      ->getDataType(), 'entity:') === 0 && !$this->entityContextDefinition) {
      $this->entityContextDefinition = EntityContextDefinition::create()
        ->setDataType($this
        ->getDataType())
        ->setLabel($this
        ->getLabel())
        ->setRequired($this
        ->isRequired())
        ->setMultiple($this
        ->isMultiple())
        ->setDescription($this
        ->getDescription())
        ->setConstraints($this->constraints)
        ->setDefaultValue($this
        ->getDefaultValue());
    }
  }

}

Classes

Name	Description
ContextDefinition	Defines a class for context definitions.