FeedsConfigurable.php in Feeds 8.2

FeedsConfigurable and helper functions.

Namespace

Drupal\feeds\Plugin

File

lib/Drupal/feeds/Plugin/FeedsConfigurable.php

<?php

/**
 * @file
 * FeedsConfigurable and helper functions.
 */
namespace Drupal\feeds\Plugin;

use Drupal\feeds\FeedsImporter;

/**
 * Used when an object does not exist in the DB or code but should.
 */
class FeedsNotExistingException extends \Exception {

}

/**
 * Base class for configurable classes. Captures configuration handling, form
 * handling and distinguishes between in-memory configuration and persistent
 * configuration.
 */
abstract class FeedsConfigurable {
  public static $instances = array();

  // Holds the actual configuration information.
  protected $config;

  // A unique identifier for the configuration.
  protected $id;

  /*
    CTools export type of this object.

    @todo Should live in FeedsImporter. Not all child classes
    of FeedsConfigurable are exportable. Same goes for $disabled.

    Export type can be one of
    FEEDS_EXPORT_NONE - the configurable only exists in memory
    EXPORT_IN_DATABASE - the configurable is defined in the database.
    EXPORT_IN_CODE - the configurable is defined in code.
    EXPORT_IN_CODE | EXPORT_IN_DATABASE - the configurable is defined in code, but
                                          overridden in the database.*/
  protected $export_type;

  /**
   * CTools export enabled status of this object.
   */
  protected $disabled;

  /**
   * Instantiate a FeedsConfigurable object.
   *
   * Don't use directly, use feeds_importer() or feeds_plugin()
   * instead.
   */
  public static function instance($class, $id) {

    // This is useful at least as long as we're developing.
    if (empty($id)) {
      throw new Exception(t('Empty configuration identifier.'));
    }
    if (!isset(static::$instances[$class][$id])) {
      static::$instances[$class][$id] = new $class($id);
    }
    return static::$instances[$class][$id];
  }

  /**
   * Constructor, set id and load default configuration.
   */
  protected function __construct($id) {

    // Set this object's id.
    $this->id = $id;

    // Per default we assume that a Feeds object is not saved to
    // database nor is it exported to code.
    $this->export_type = FEEDS_EXPORT_NONE;

    // Make sure configuration is populated.
    $this->config = $this
      ->configDefaults();
    $this->disabled = FALSE;
  }

  /**
   * Override magic method __isset(). This is needed due to overriding __get().
   */
  public function __isset($name) {
    return isset($this->{$name}) ? TRUE : FALSE;
  }

  /**
   * Determine whether this object is persistent and enabled. I. e. it is
   * defined either in code or in the database and it is enabled.
   */
  public function existing() {

    // if ($this->export_type == FEEDS_EXPORT_NONE) {
    //   throw new FeedsNotExistingException(t('Object is not persistent.'));
    // }
    // if ($this->disabled) {
    //   throw new FeedsNotExistingException(t('Object is disabled.'));
    // }
    return $this;
  }

  /**
   * Save a configuration. Concrete extending classes must implement a save
   * operation.
   */
  public abstract function save();

  /**
   * Copy a configuration.
   */
  public function copy(FeedsConfigurable $configurable) {
    $this
      ->setConfig($configurable->config);
  }

  /**
   * Set configuration.
   *
   * @param $config
   *   Array containing configuration information. Config array will be filtered
   *   by the keys returned by configDefaults() and populated with default
   *   values that are not included in $config.
   */
  public function setConfig($config) {
    $defaults = $this
      ->configDefaults();
    $this->config = array_intersect_key($config, $defaults) + $defaults;
  }

  /**
   * Similar to setConfig but adds to existing configuration.
   *
   * @param $config
   *   Array containing configuration information. Will be filtered by the keys
   *   returned by configDefaults().
   */
  public function addConfig($config) {
    $this->config = is_array($this->config) ? array_merge($this->config, $config) : $config;
    $default_keys = $this
      ->configDefaults();
    $this->config = array_intersect_key($this->config, $default_keys);
  }

  /**
   * Override magic method __get(). Make sure that $this->config goes through
   * getConfig().
   */
  public function __get($name) {
    if ($name == 'config') {
      return $this
        ->getConfig();
    }
    return isset($this->{$name}) ? $this->{$name} : NULL;
  }

  /**
   * Implements getConfig().
   *
   * Return configuration array, ensure that all default values are present.
   */
  public function getConfig() {
    $defaults = $this
      ->configDefaults();
    return $this->config + $defaults;
  }

  /**
   * Return default configuration.
   *
   * @todo rename to getConfigDefaults().
   *
   * @return
   *   Array where keys are the variable names of the configuration elements and
   *   values are their default values.
   */
  public function configDefaults() {
    return array();
  }

  /**
   * Return configuration form for this object. The keys of the configuration
   * form must match the keys of the array returned by configDefaults().
   *
   * @return
   *   FormAPI style form definition.
   */
  public function configForm(&$form_state) {
    return array();
  }

  /**
   * Validation handler for configForm().
   *
   * Set errors with form_set_error().
   *
   * @param $values
   *   An array that contains the values entered by the user through configForm.
   */
  public function configFormValidate(&$values) {
  }

  /**
   *  Submission handler for configForm().
   *
   *  @param $values
   */
  public function configFormSubmit(&$values) {
    $this
      ->addConfig($values);
    $this
      ->save();
    drupal_set_message(t('Your changes have been saved.'));
    feeds_cache_clear(FALSE);
  }

}

Classes

Name	Description
FeedsConfigurable	Base class for configurable classes. Captures configuration handling, form handling and distinguishes between in-memory configuration and persistent configuration.
FeedsNotExistingException	Used when an object does not exist in the DB or code but should.