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<?php
namespace Drupal\Component\Plugin\Context;
use Drupal\Component\Plugin\Exception\ContextException;
use Symfony\Component\Validator\Constraints\Type;
use Symfony\Component\Validator\Validation;
/**
* A generic context class for wrapping data a plugin needs to operate.
*/
class Context implements ContextInterface {
/**
* The value of the context.
*
* @var mixed
*/
protected $contextValue;
/**
* The definition to which a context must conform.
*
* @var \Drupal\Component\Plugin\Context\ContextDefinitionInterface
*/
protected $contextDefinition;
/**
* Create a context object.
*
* @param \Drupal\Component\Plugin\Context\ContextDefinitionInterface $context_definition
* The context definition.
* @param mixed|null $context_value
* The value of the context.
*/
public function __construct(ContextDefinitionInterface $context_definition, $context_value = NULL) {
$this->contextDefinition = $context_definition;
$this->contextValue = $context_value;
}
/**
* {@inheritdoc}
*/
public function getContextValue() {
// Support optional contexts.
if (!isset($this->contextValue)) {
$definition = $this->getContextDefinition();
$default_value = $definition->getDefaultValue();
if (!isset($default_value) && $definition->isRequired()) {
$type = $definition->getDataType();
throw new ContextException(sprintf("The %s context is required and not present.", $type));
}
// Keep the default value here so that subsequent calls don't have to look
// it up again.
$this->contextValue = $default_value;
}
return $this->contextValue;
}
/**
* {@inheritdoc}
*/
public function hasContextValue() {
return (bool) $this->contextValue || (bool) $this->getContextDefinition()->getDefaultValue();
}
/**
* {@inheritdoc}
*/
public function getContextDefinition() {
return $this->contextDefinition;
}
/**
* {@inheritdoc}
*/
public function getConstraints() {
if (empty($this->contextDefinition['class'])) {
throw new ContextException("An error was encountered while trying to validate the context.");
}
return [new Type($this->contextDefinition['class'])];
}
/**
* {@inheritdoc}
*/
public function validate() {
$validator = Validation::createValidatorBuilder()
->getValidator();
return $validator->validateValue($this->getContextValue(), $this->getConstraints());
}
}