diff core/lib/Drupal/Core/Field/FieldItemInterface.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/Field/FieldItemInterface.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,465 @@
+<?php
+
+namespace Drupal\Core\Field;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\TypedData\ComplexDataInterface;
+
+/**
+ * Interface for entity field items.
+ *
+ * Entity field items are typed data objects containing the field values, i.e.
+ * implementing the ComplexDataInterface.
+ *
+ * When implementing this interface which extends Traversable, make sure to list
+ * IteratorAggregate or Iterator before this interface in the implements clause.
+ *
+ * @see \Drupal\Core\Field\FieldItemListInterface
+ * @see \Drupal\Core\Field\FieldItemBase
+ * @ingroup field_types
+ */
+interface FieldItemInterface extends ComplexDataInterface {
+
+  /**
+   * Defines field item properties.
+   *
+   * Properties that are required to constitute a valid, non-empty item should
+   * be denoted with \Drupal\Core\TypedData\DataDefinition::setRequired().
+   *
+   * @return \Drupal\Core\TypedData\DataDefinitionInterface[]
+   *   An array of property definitions of contained properties, keyed by
+   *   property name.
+   *
+   * @see \Drupal\Core\Field\BaseFieldDefinition
+   */
+  public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition);
+
+  /**
+   * Returns the name of the main property, if any.
+   *
+   * Some field items consist mainly of one main property, e.g. the value of a
+   * text field or the @code target_id @endcode of an entity reference. If the
+   * field item has no main property, the method returns NULL.
+   *
+   * @return string|null
+   *   The name of the value property, or NULL if there is none.
+   *
+   * @see \Drupal\Core\Field\BaseFieldDefinition
+   */
+  public static function mainPropertyName();
+
+  /**
+   * Returns the schema for the field.
+   *
+   * This method is static because the field schema information is needed on
+   * creation of the field. FieldItemInterface objects instantiated at that
+   * time are not reliable as field settings might be missing.
+   *
+   * Computed fields having no schema should return an empty array.
+   *
+   * @param \Drupal\Core\Field\FieldStorageDefinitionInterface $field_definition
+   *   The field definition.
+   *
+   * @return array
+   *   An empty array if there is no schema, or an associative array with the
+   *   following key/value pairs:
+   *   - columns: An array of Schema API column specifications, keyed by column
+   *     name. The columns need to be a subset of the properties defined in
+   *     propertyDefinitions(). The 'not null' property is ignored if present,
+   *     as it is determined automatically by the storage controller depending
+   *     on the table layout and the property definitions. It is recommended to
+   *     avoid having the column definitions depend on field settings when
+   *     possible. No assumptions should be made on how storage engines
+   *     internally use the original column name to structure their storage.
+   *   - unique keys: (optional) An array of Schema API unique key definitions.
+   *     Only columns that appear in the 'columns' array are allowed.
+   *   - indexes: (optional) An array of Schema API index definitions. Only
+   *     columns that appear in the 'columns' array are allowed. Those indexes
+   *     will be used as default indexes. Field definitions can specify
+   *     additional indexes or, at their own risk, modify the default indexes
+   *     specified by the field-type module. Some storage engines might not
+   *     support indexes.
+   *   - foreign keys: (optional) An array of Schema API foreign key
+   *     definitions. Note, however, that the field data is not necessarily
+   *     stored in SQL. Also, the possible usage is limited, as you cannot
+   *     specify another field as related, only existing SQL tables,
+   *     such as {taxonomy_term_data}.
+   */
+  public static function schema(FieldStorageDefinitionInterface $field_definition);
+
+  /**
+   * Gets the entity that field belongs to.
+   *
+   * @return \Drupal\Core\Entity\FieldableEntityInterface
+   *   The entity object.
+   */
+  public function getEntity();
+
+  /**
+   * Gets the langcode of the field values held in the object.
+   *
+   * @return string
+   *   The langcode.
+   */
+  public function getLangcode();
+
+  /**
+   * Gets the field definition.
+   *
+   * @return \Drupal\Core\Field\FieldDefinitionInterface
+   *   The field definition.
+   */
+  public function getFieldDefinition();
+
+  /**
+   * Magic method: Gets a property value.
+   *
+   * @param string $property_name
+   *   The name of the property to get; e.g., 'title' or 'name'.
+   *
+   * @return mixed
+   *   The property value.
+   *
+   * @throws \InvalidArgumentException
+   *   If a not existing property is accessed.
+   */
+  public function __get($property_name);
+
+  /**
+   * Magic method: Sets a property value.
+   *
+   * @param string $property_name
+   *   The name of the property to set; e.g., 'title' or 'name'.
+   * @param mixed $value
+   *   The value to set, or NULL to unset the property. Optionally, a typed
+   *   data object implementing Drupal\Core\TypedData\TypedDataInterface may be
+   *   passed instead of a plain value.
+   *
+   * @throws \InvalidArgumentException
+   *   If a not existing property is set.
+   */
+  public function __set($property_name, $value);
+
+  /**
+   * Magic method: Determines whether a property is set.
+   *
+   * @param string $property_name
+   *   The name of the property to get; e.g., 'title' or 'name'.
+   *
+   * @return bool
+   *   Returns TRUE if the property exists and is set, FALSE otherwise.
+   */
+  public function __isset($property_name);
+
+  /**
+   * Magic method: Unsets a property.
+   *
+   * @param string $property_name
+   *   The name of the property to get; e.g., 'title' or 'name'.
+   */
+  public function __unset($property_name);
+
+  /**
+   * Returns a renderable array for a single field item.
+   *
+   * @param array $display_options
+   *   Can be either the name of a view mode, or an array of display settings.
+   *   See EntityViewBuilderInterface::viewField() for more information.
+   *
+   * @return array
+   *   A renderable array for the field item.
+   *
+   * @see \Drupal\Core\Entity\EntityViewBuilderInterface::viewField()
+   * @see \Drupal\Core\Entity\EntityViewBuilderInterface::viewFieldItem()
+   * @see \Drupal\Core\Field\FieldItemListInterface::view()
+   */
+  public function view($display_options = []);
+
+  /**
+   * Defines custom presave behavior for field values.
+   *
+   * This method is called during the process of saving an entity, just before
+   * values are written into storage. When storing a new entity, its identifier
+   * will not be available yet. This should be used to massage item property
+   * values or perform any other operation that needs to happen before values
+   * are stored. For instance this is the proper phase to auto-create a new
+   * entity for an entity reference field item, because this way it will be
+   * possible to store the referenced entity identifier.
+   */
+  public function preSave();
+
+  /**
+   * Defines custom post-save behavior for field values.
+   *
+   * This method is called during the process of saving an entity, just after
+   * values are written into storage. This is useful mostly when the business
+   * logic to be implemented always requires the entity identifier, even when
+   * storing a new entity. For instance, when implementing circular entity
+   * references, the referenced entity will be created on pre-save with a dummy
+   * value for the referring entity identifier, which will be updated with the
+   * actual one on post-save.
+   *
+   * In the rare cases where item properties depend on the entity identifier,
+   * massaging logic will have to be implemented on post-save and returning TRUE
+   * will allow them to be rewritten to the storage with the updated values.
+   *
+   * @param bool $update
+   *   Specifies whether the entity is being updated or created.
+   *
+   * @return bool
+   *   Whether field items should be rewritten to the storage as a consequence
+   *   of the logic implemented by the custom behavior.
+   */
+  public function postSave($update);
+
+  /**
+   * Defines custom delete behavior for field values.
+   *
+   * This method is called during the process of deleting an entity, just before
+   * values are deleted from storage.
+   */
+  public function delete();
+
+  /**
+   * Defines custom revision delete behavior for field values.
+   *
+   * This method is called from during the process of deleting an entity
+   * revision, just before the field values are deleted from storage. It is only
+   * called for entity types that support revisioning.
+   */
+  public function deleteRevision();
+
+  /**
+   * Generates placeholder field values.
+   *
+   * Useful when populating site with placeholder content during site building
+   * or profiling.
+   *
+   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
+   *   The field definition.
+   *
+   * @return array
+   *   An associative array of values.
+   */
+  public static function generateSampleValue(FieldDefinitionInterface $field_definition);
+
+  /**
+   * Defines the storage-level settings for this plugin.
+   *
+   * @return array
+   *   A list of default settings, keyed by the setting name.
+   */
+  public static function defaultStorageSettings();
+
+  /**
+   * Defines the field-level settings for this plugin.
+   *
+   * @return array
+   *   A list of default settings, keyed by the setting name.
+   */
+  public static function defaultFieldSettings();
+
+  /**
+   * Returns a settings array that can be stored as a configuration value.
+   *
+   * For all use cases where field settings are stored and managed as
+   * configuration, this method is used to map from the field type's
+   * representation of its settings to a representation compatible with
+   * deployable configuration. This includes:
+   * - Array keys at any depth must not contain a ".".
+   * - Ideally, array keys at any depth are either numeric or can be enumerated
+   *   as a "mapping" within the configuration schema. While not strictly
+   *   required, this simplifies configuration translation UIs, configuration
+   *   migrations between Drupal versions, and other use cases.
+   * - To support configuration deployments, references to content entities
+   *   must use UUIDs rather than local IDs.
+   *
+   * An example of a conversion between representations might be an
+   * "allowed_values" setting that's structured by the field type as a
+   * \Drupal\Core\TypedData\OptionsProviderInterface::getPossibleOptions()
+   * result (i.e., values as keys and labels as values). For such a use case,
+   * in order to comply with the above, this method could convert that
+   * representation to a numerically indexed array whose values are sub-arrays
+   * with the schema definable keys of "value" and "label".
+   *
+   * @param array $settings
+   *   The field's settings in the field type's canonical representation.
+   *
+   * @return array
+   *   An array (either the unmodified $settings or a modified representation)
+   *   that is suitable for storing as a deployable configuration value.
+   *
+   * @see \Drupal\Core\Config\Config::set()
+   */
+  public static function storageSettingsToConfigData(array $settings);
+
+  /**
+   * Returns a settings array in the field type's canonical representation.
+   *
+   * This function does the inverse of static::storageSettingsToConfigData(). It's
+   * called when loading a field's settings from a configuration object.
+   *
+   * @param array $settings
+   *   The field's settings, as it is stored within a configuration object.
+   *
+   * @return array
+   *   The settings, in the representation expected by the field type and code
+   *   that interacts with it.
+   *
+   * @see \Drupal\Core\Field\FieldItemInterface::storageSettingsToConfigData()
+   */
+  public static function storageSettingsFromConfigData(array $settings);
+
+  /**
+   * Returns a settings array that can be stored as a configuration value.
+   *
+   * Same as static::storageSettingsToConfigData(), but for the field's settings.
+   *
+   * @param array $settings
+   *   The field's settings in the field type's canonical representation.
+   *
+   * @return array
+   *   An array (either the unmodified $settings or a modified representation)
+   *   that is suitable for storing as a deployable configuration value.
+   *
+   * @see \Drupal\Core\Field\FieldItemInterface::storageSettingsToConfigData()
+   */
+  public static function fieldSettingsToConfigData(array $settings);
+
+  /**
+   * Returns a settings array in the field type's canonical representation.
+   *
+   * This function does the inverse of static::fieldSettingsToConfigData().
+   * It's called when loading a field's settings from a configuration
+   * object.
+   *
+   * @param array $settings
+   *   The field's settings, as it is stored within a configuration
+   *   object.
+   *
+   * @return array
+   *   The field settings, in the representation expected by the field type
+   *   and code that interacts with it.
+   *
+   * @see \Drupal\Core\Field\FieldItemInterface::fieldSettingsToConfigData()
+   */
+  public static function fieldSettingsFromConfigData(array $settings);
+
+  /**
+   * Returns a form for the storage-level settings.
+   *
+   * Invoked from \Drupal\field_ui\Form\FieldStorageConfigEditForm to allow
+   * administrators to configure storage-level settings.
+   *
+   * Field storage might reject settings changes that affect the field
+   * storage schema if the storage already has data. When the $has_data
+   * parameter is TRUE, the form should not allow changing the settings that
+   * take part in the schema() method. It is recommended to set #access to
+   * FALSE on the corresponding elements.
+   *
+   * @param array $form
+   *   The form where the settings form is being included in.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The form state of the (entire) configuration form.
+   * @param bool $has_data
+   *   TRUE if the field already has data, FALSE if not.
+   *
+   * @return array
+   *   The form definition for the field settings.
+   */
+  public function storageSettingsForm(array &$form, FormStateInterface $form_state, $has_data);
+
+  /**
+   * Returns a form for the field-level settings.
+   *
+   * Invoked from \Drupal\field_ui\Form\FieldConfigEditForm to allow
+   * administrators to configure field-level settings.
+   *
+   * @param array $form
+   *   The form where the settings form is being included in.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The form state of the (entire) configuration form.
+   *
+   * @return array
+   *   The form definition for the field settings.
+   */
+  public function fieldSettingsForm(array $form, FormStateInterface $form_state);
+
+  /**
+   * Calculates dependencies for field items.
+   *
+   * Dependencies are saved in the field configuration entity and are used to
+   * determine configuration synchronization order. For example, if the field
+   * type's default value is a content entity, this method should return an
+   * array of dependencies listing the content entities.
+   *
+   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
+   *   The field definition.
+   *
+   * @return array
+   *   An array of dependencies grouped by type (config, content, module,
+   *   theme). For example:
+   *   @code
+   *   array(
+   *     'config' => array('user.role.anonymous', 'user.role.authenticated'),
+   *     'content' => array('node:article:f0a189e6-55fb-47fb-8005-5bef81c44d6d'),
+   *     'module' => array('node', 'user'),
+   *     'theme' => array('seven'),
+   *   );
+   *   @endcode
+   *
+   * @see \Drupal\Core\Config\Entity\ConfigDependencyManager
+   * @see \Drupal\Core\Config\Entity\ConfigEntityInterface::getConfigDependencyName()
+   */
+  public static function calculateDependencies(FieldDefinitionInterface $field_definition);
+
+  /**
+   * Calculates dependencies for field items on the storage level.
+   *
+   * Dependencies are saved in the field storage configuration entity and are
+   * used to determine configuration synchronization order. For example, if the
+   * field type storage depends on a particular entity type, this method should
+   * return an array of dependencies listing the module that provides the entity
+   * type.
+   *
+   * Dependencies returned from this method are stored in field storage
+   * configuration and are always considered hard dependencies. If the
+   * dependency is removed the field storage configuration must be deleted.
+   *
+   * @param \Drupal\Core\Field\FieldStorageDefinitionInterface $field_storage_definition
+   *   The field storage definition.
+   *
+   * @return array
+   *   An array of dependencies grouped by type (config, content, module,
+   *   theme). For example:
+   *   @code
+   *   [
+   *     'config' => ['user.role.anonymous', 'user.role.authenticated'],
+   *     'content' => ['node:article:f0a189e6-55fb-47fb-8005-5bef81c44d6d'],
+   *     'module' => ['node', 'user'],
+   *     'theme' => ['seven'],
+   *   ];
+   *   @endcode
+   *
+   * @see \Drupal\Core\Config\Entity\ConfigDependencyManager
+   * @see \Drupal\Core\Config\Entity\ConfigEntityInterface::getConfigDependencyName()
+   */
+  public static function calculateStorageDependencies(FieldStorageDefinitionInterface $field_storage_definition);
+
+  /**
+   * Informs the plugin that a dependency of the field will be deleted.
+   *
+   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
+   *   The field definition.
+   * @param array $dependencies
+   *   An array of dependencies that will be deleted keyed by dependency type.
+   *   Dependency types are, for example, entity, module and theme.
+   *
+   * @return bool
+   *   TRUE if the field definition has been changed as a result, FALSE if not.
+   *
+   * @see \Drupal\Core\Config\ConfigEntityInterface::onDependencyRemoval()
+   */
+  public static function onDependencyRemoval(FieldDefinitionInterface $field_definition, array $dependencies);
+
+}