DerivativeInterface.php

<?php

/**
 * @file
 * Definition of Drupal\Component\Plugin\Derivative\DerivativeInterface.
 */
namespace Drupal\Component\Plugin\Derivative;


/**
 * Plugin interface for derivative plugin handling.
 */
interface DerivativeInterface {

  /**
   * Returns the definition of a derivative plugin.
   *
   * @param string $derivative_id
   *   The derivative id. The id must uniquely identify the derivative within a
   *   given base plugin, but derivative ids can be reused across base plugins.
   * @param array $base_plugin_definition
   *   The definition array of the base plugin from which the derivative plugin
   *   is derived.
   *
   * @return array
   *   The full definition array of the derivative plugin, typically a merge of
   *   $base_plugin_definition with extra derivative-specific information. NULL
   *   if the derivative doesn't exist.
   */
  public function getDerivativeDefinition($derivative_id, array $base_plugin_definition);

  /**
   * Returns the definition of all derivatives of a base plugin.
   *
   * @param array $base_plugin_definition
   *   The definition array of the base plugin.
   * @return array
   *   An array of full derivative definitions keyed on derivative id.
   *
   * @see getDerivativeDefinition()
   */
  public function getDerivativeDefinitions(array $base_plugin_definition);

}