FieldItemDataDefinitionInterface.php

<?php

namespace Drupal\Core\Field\TypedData;

use Drupal\Core\TypedData\ComplexDataDefinitionInterface;

/**
 * Interface for field item data definitions.
 *
 * @ingroup typed_data
 */
interface FieldItemDataDefinitionInterface extends ComplexDataDefinitionInterface {
    
    /**
     * Gets the field item's field definition.
     *
     * @return \Drupal\Core\Field\FieldDefinitionInterface
     *   The field definition for this field item.
     */
    public function getFieldDefinition();
    
    /**
     * Sets the field item's field definition.
     *
     * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
     *   The new field definition to assign to this item definition.
     *
     * @return static
     *   The object itself for chaining.
     *
     * @internal
     *   Should not be used in user code. It allows to overwrite the item
     *   definition property of the cloned field definition.
     */
    public function setFieldDefinition($field_definition);

}