Replaced rdf_mapping_save|load|delete with RdfMapping configurable

In Drupal 7, the RDF mapping API used a nested array to store a bundle's mappings. In Drupal 8, these mappings are stored using an RdfMapping configurable object.

Saving

Saving in Drupal 7:

<?php
$mapping = array(
  'type' => 'node',
  'bundle' => 'article',
  'mapping' => array(
    'rdftype' => array('sioc:Post'),
    'title' => array(
      'predicates' => array('dc:title'),
    ),
    'created' => array(
      'predicates' => array('dc:date', 'dc:created'),
      'datatype' => 'xsd:dateTime',
      'callback' => 'date_iso8601',
    ),
    'uid' => array(
      'predicates' => array('sioc:has_creator'),
      'type' => 'rel',
    ),
  ),
);
rdf_mapping_save($mapping);
?>

Saving in Drupal 8:

<?php
$mapping = rdf_get_mapping('node', 'article');

// Save the type mapping.
$mapping->setBundleMapping(array(
    'types' => array('sioc:Post'),
  ))
  ->save();

// Save the title field mapping.
$mapping->setFieldMapping('title', array(
    'properties' => array('dc:title'),
  ))
  ->save();

// Save the created field mapping.
$mapping->setFieldMapping('created', array(
    'properties' => array('dc:date', 'dc:created'),
    'datatype' => 'xsd:dateTime',
    'datatype_callback' => 'date_iso8601',
  ))
  ->save();

// Save the uid field mapping.
$mapping->setFieldMapping('uid', array(
    'properties' => array('sioc:has_creator'),
    'mapping_type' => 'rel',
  ))
  ->save();
?>

Loading

Loading in Drupal 7:

<?php
$mapping = rdf_mapping_load('node', 'article');

/**
  Returns the following:
  array(
    'rdftype' => array('sioc:Post'),
    'title' => array(
      'predicates' => array('dc:title'),
    ),
    'created' => array(
      'predicates' => array('dc:date', 'dc:created'),
      'datatype' => 'xsd:dateTime',
      'callback' => 'date_iso8601',
    ),
    'uid' => array(
      'predicates' => array('sioc:has_creator'),
      'type' => 'rel',
    ),
  );
 */
?>

Loading in Drupal 8:

<?php
/**
  Loads a mapping for placement in HTML.
 */

$mapping = rdf_get_mapping('node', 'article');

// Loads the prepared type mapping.
$bundle_mapping = $mapping->getPreparedBundleMapping();
/**
  Returns the following:
  array( 
    'types' => array('sioc:Post'),
  );
 */

// Loads the prepared field mapping.
$title_mapping = $mapping->getPreparedFieldMapping('title');
/**
  Returns the following:
  array( 
    'properties' => array('dc:title'),
    'datatype' => NULL,
    'datatype_callback' => NULL,
    'mapping_type' => NULL,
  );
 */
?>

<?php
/**
  Loads a mapping to be edited.
 */

$mapping = rdf_get_mapping('node', 'article');

// Loads the type mapping config.
$bundle_mapping = $mapping->getBundleMapping();
/**
  Returns the following:
  array( 
    'types' => array('sioc:Post'),
  );
 */

// Loads the field mapping config.
$title_mapping = $mapping->getFieldMapping('title');
/**
  Returns the following:
  array( 
    'properties' => array('dc:title'),
  );
 */
?>