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<?php | |
/** | |
* @file | |
* Contains \Drupal\Core\Field\FieldItemList. | |
*/ | |
namespace Drupal\Core\Field; | |
use Drupal\Core\Access\AccessResult; | |
use Drupal\Core\Entity\FieldableEntityInterface; | |
use Drupal\Core\Form\FormStateInterface; | |
use Drupal\Core\Language\LanguageInterface; | |
use Drupal\Core\Session\AccountInterface; | |
use Drupal\Core\TypedData\Plugin\DataType\ItemList; | |
/** | |
* Represents an entity field; that is, a list of field item objects. | |
* | |
* An entity field is a list of field items, each containing a set of | |
* properties. Note that even single-valued entity fields are represented as | |
* list of field items, however for easy access to the contained item the entity | |
* field delegates __get() and __set() calls directly to the first item. | |
*/ | |
class FieldItemList extends ItemList implements FieldItemListInterface { | |
/** | |
* Numerically indexed array of field items. | |
* | |
* @var \Drupal\Core\Field\FieldItemInterface[] | |
*/ | |
protected $list = array(); | |
/** | |
* The langcode of the field values held in the object. | |
* | |
* @var string | |
*/ | |
protected $langcode = LanguageInterface::LANGCODE_NOT_SPECIFIED; | |
/** | |
* {@inheritdoc} | |
*/ | |
protected function createItem($offset = 0, $value = NULL) { | |
return \Drupal::service('plugin.manager.field.field_type')->createFieldItem($this, $offset, $value); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function getEntity() { | |
// The "parent" is the TypedData object for the entity, we need to unwrap | |
// the actual entity. | |
return $this->getParent()->getValue(); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function setLangcode($langcode) { | |
$this->langcode = $langcode; | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function getLangcode() { | |
return $this->langcode; | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function getFieldDefinition() { | |
return $this->definition; | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function getSettings() { | |
return $this->definition->getSettings(); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function getSetting($setting_name) { | |
return $this->definition->getSetting($setting_name); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function filterEmptyItems() { | |
$this->filter(function ($item) { | |
return !$item->isEmpty(); | |
}); | |
return $this; | |
} | |
/** | |
* {@inheritdoc} | |
* @todo Revisit the need when all entity types are converted to NG entities. | |
*/ | |
public function getValue($include_computed = FALSE) { | |
$values = array(); | |
foreach ($this->list as $delta => $item) { | |
$values[$delta] = $item->getValue($include_computed); | |
} | |
return $values; | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function setValue($values, $notify = TRUE) { | |
// Support passing in only the value of the first item, either as a literal | |
// (value of the first property) or as an array of properties. | |
if (isset($values) && (!is_array($values) || (!empty($values) && !is_numeric(current(array_keys($values)))))) { | |
$values = array(0 => $values); | |
} | |
parent::setValue($values, $notify); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function __get($property_name) { | |
// For empty fields, $entity->field->property is NULL. | |
if ($item = $this->first()) { | |
return $item->__get($property_name); | |
} | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function __set($property_name, $value) { | |
// For empty fields, $entity->field->property = $value automatically | |
// creates the item before assigning the value. | |
$item = $this->first() ?: $this->appendItem(); | |
$item->__set($property_name, $value); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function __isset($property_name) { | |
if ($item = $this->first()) { | |
return $item->__isset($property_name); | |
} | |
return FALSE; | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function __unset($property_name) { | |
if ($item = $this->first()) { | |
$item->__unset($property_name); | |
} | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function access($operation = 'view', AccountInterface $account = NULL, $return_as_object = FALSE) { | |
$access_control_handler = \Drupal::entityManager()->getAccessControlHandler($this->getEntity()->getEntityTypeId()); | |
return $access_control_handler->fieldAccess($operation, $this->getFieldDefinition(), $account, $this, $return_as_object); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function defaultAccess($operation = 'view', AccountInterface $account = NULL) { | |
// Grant access per default. | |
return AccessResult::allowed(); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function applyDefaultValue($notify = TRUE) { | |
if ($value = $this->getFieldDefinition()->getDefaultValue($this->getEntity())) { | |
$this->setValue($value, $notify); | |
} | |
else { | |
// Create one field item and give it a chance to apply its defaults. | |
// Remove it if this ended up doing nothing. | |
// @todo Having to create an item in case it wants to set a value is | |
// absurd. Remove that in https://www.drupal.org/node/2356623. | |
$item = $this->first() ?: $this->appendItem(); | |
$item->applyDefaultValue(FALSE); | |
$this->filterEmptyItems(); | |
} | |
return $this; | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function preSave() { | |
// Filter out empty items. | |
$this->filterEmptyItems(); | |
$this->delegateMethod('preSave'); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function postSave($update) { | |
$result = $this->delegateMethod('postSave', $update); | |
return (bool) array_filter($result); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function delete() { | |
$this->delegateMethod('delete'); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function deleteRevision() { | |
$this->delegateMethod('deleteRevision'); | |
} | |
/** | |
* Calls a method on each FieldItem. | |
* | |
* Any argument passed will be forwarded to the invoked method. | |
* | |
* @param string $method | |
* The name of the method to be invoked. | |
* | |
* @return array | |
* An array of results keyed by delta. | |
*/ | |
protected function delegateMethod($method) { | |
$result = []; | |
$args = array_slice(func_get_args(), 1); | |
foreach ($this->list as $delta => $item) { | |
// call_user_func_array() is way slower than a direct call so we avoid | |
// using it if have no parameters. | |
$result[$delta] = $args ? call_user_func_array([$item, $method], $args) : $item->{$method}(); | |
} | |
return $result; | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function view($display_options = array()) { | |
$view_builder = \Drupal::entityManager()->getViewBuilder($this->getEntity()->getEntityTypeId()); | |
return $view_builder->viewField($this, $display_options); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function generateSampleItems($count = 1) { | |
$field_definition = $this->getFieldDefinition(); | |
$field_type_class = \Drupal::service('plugin.manager.field.field_type')->getPluginClass($field_definition->getType()); | |
for ($delta = 0; $delta < $count; $delta++) { | |
$values[$delta] = $field_type_class::generateSampleValue($field_definition); | |
} | |
$this->setValue($values); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function getConstraints() { | |
$constraints = parent::getConstraints(); | |
// Check that the number of values doesn't exceed the field cardinality. For | |
// form submitted values, this can only happen with 'multiple value' | |
// widgets. | |
$cardinality = $this->getFieldDefinition()->getFieldStorageDefinition()->getCardinality(); | |
if ($cardinality != FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED) { | |
$constraints[] = $this->getTypedDataManager() | |
->getValidationConstraintManager() | |
->create('Count', array( | |
'max' => $cardinality, | |
'maxMessage' => t('%name: this field cannot hold more than @count values.', array('%name' => $this->getFieldDefinition()->getLabel(), '@count' => $cardinality)), | |
)); | |
} | |
return $constraints; | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function defaultValuesForm(array &$form, FormStateInterface $form_state) { | |
if (empty($this->getFieldDefinition()->getDefaultValueCallback())) { | |
if ($widget = $this->defaultValueWidget($form_state)) { | |
// Place the input in a separate place in the submitted values tree. | |
$element = array('#parents' => array('default_value_input')); | |
$element += $widget->form($this, $element, $form_state); | |
return $element; | |
} | |
else { | |
return ['#markup' => $this->t('No widget available for: %type.', ['%type' => $this->getFieldDefinition()->getType()])]; | |
} | |
} | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function defaultValuesFormValidate(array $element, array &$form, FormStateInterface $form_state) { | |
// Extract the submitted value, and validate it. | |
if ($widget = $this->defaultValueWidget($form_state)) { | |
$widget->extractFormValues($this, $element, $form_state); | |
// Force a non-required field definition. | |
// @see self::defaultValueWidget(). | |
$this->getFieldDefinition()->setRequired(FALSE); | |
$violations = $this->validate(); | |
// Assign reported errors to the correct form element. | |
if (count($violations)) { | |
$widget->flagErrors($this, $violations, $element, $form_state); | |
} | |
} | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function defaultValuesFormSubmit(array $element, array &$form, FormStateInterface $form_state) { | |
// Extract the submitted value, and return it as an array. | |
if ($widget = $this->defaultValueWidget($form_state)) { | |
$widget->extractFormValues($this, $element, $form_state); | |
return $this->getValue(); | |
} | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public static function processDefaultValue($default_value, FieldableEntityInterface $entity, FieldDefinitionInterface $definition) { | |
return $default_value; | |
} | |
/** | |
* Returns the widget object used in default value form. | |
* | |
* @param \Drupal\Core\Form\FormStateInterface $form_state | |
* The form state of the (entire) configuration form. | |
* | |
* @return \Drupal\Core\Field\WidgetInterface|null | |
* A Widget object or NULL if no widget is available. | |
*/ | |
protected function defaultValueWidget(FormStateInterface $form_state) { | |
if (!$form_state->has('default_value_widget')) { | |
$entity = $this->getEntity(); | |
// Force a non-required widget. | |
$definition = $this->getFieldDefinition(); | |
$definition->setRequired(FALSE); | |
$definition->setDescription(''); | |
// Use the widget currently configured for the 'default' form mode, or | |
// fallback to the default widget for the field type. | |
$entity_form_display = entity_get_form_display($entity->getEntityTypeId(), $entity->bundle(), 'default'); | |
$widget = $entity_form_display->getRenderer($this->getFieldDefinition()->getName()); | |
if (!$widget) { | |
$widget = \Drupal::service('plugin.manager.field.widget')->getInstance(array('field_definition' => $this->getFieldDefinition())); | |
} | |
$form_state->set('default_value_widget', $widget); | |
} | |
return $form_state->get('default_value_widget'); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function equals(FieldItemListInterface $list_to_compare) { | |
$columns = $this->getFieldDefinition()->getFieldStorageDefinition()->getColumns(); | |
$count1 = count($this); | |
$count2 = count($list_to_compare); | |
if ($count1 === 0 && $count2 === 0) { | |
// Both are empty we can safely assume that it did not change. | |
return TRUE; | |
} | |
if ($count1 !== $count2) { | |
// One of them is empty but not the other one so the value changed. | |
return FALSE; | |
} | |
$value1 = $this->getValue(); | |
$value2 = $list_to_compare->getValue(); | |
if ($value1 === $value2) { | |
return TRUE; | |
} | |
// If the values are not equal ensure a consistent order of field item | |
// properties and remove properties which will not be saved. | |
$callback = function (&$value) use ($columns) { | |
if (is_array($value)) { | |
$value = array_intersect_key($value, $columns); | |
ksort($value); | |
} | |
}; | |
array_walk($value1, $callback); | |
array_walk($value2, $callback); | |
return $value1 == $value2; | |
} | |
} |