evoc.module in RDF Extensions 7.2

Allows to import external Vocabularies in order to map them to Drupal data structure.

File

evoc/evoc.module

<?php

/**
 * @file
 * Allows to import external Vocabularies in order to map them to Drupal data
 * structure.
 */

/**
 * Implements hook_menu().
 */
function evoc_menu() {
  $items['evoc/import'] = array(
    'title' => 'Import external RDF vocabulary',
    'description' => 'Import RDF terms of an external vocabulary.',
    'page callback' => 'evoc_import',
    'access arguments' => array(
      'administer content types',
    ),
    'file' => 'evoc.pages.inc',
  );
  $items['evoc/import_core'] = array(
    'title' => 'Import core RDF vocabularies',
    'description' => 'Perform a batch import of the vocabularies used by core.',
    'page callback' => 'evoc_import_core',
    'access arguments' => array(
      'administer content types',
    ),
    'file' => 'evoc.pages.inc',
  );
  return $items;
}

/**
 * Implements hook_menu().
 */
function evoc_rdf_namespaces() {
  $ns_mappings = array();
  $query = db_select('rdfx_vocabulary_graphs', 'g');
  $query
    ->fields('n', array(
    'prefix',
    'uri',
  ));
  $query
    ->join('rdfx_namespaces', 'n', 'g.main_ns = n.nsid');
  $query
    ->orderBy('n.prefix');
  $namespaces = $query
    ->execute()
    ->fetchAll();
  foreach ((array) $namespaces as $namespace) {
    $ns_mappings[$namespace->prefix] = $namespace->uri;
  }
  return $ns_mappings;
}

/*
 * Import function for the evoc module.
 */
function evoc_import_vocabulary($vocabulary_uri, $vocabulary_prefix) {

  // Fetch the defined terms and a list of the defined namespaces.
  $fetched_vocab = evoc_fetch_vocabulary($vocabulary_uri, $vocabulary_prefix);
  rdfx_save_terms($vocabulary_uri, $vocabulary_prefix, $fetched_vocab);

  // Refresh the static variable that holds the array of namespaces.
  drupal_static_reset('rdfx_get_namespaces');

  //_evoc_save_rdf_terms($vocabulary_uri, $vocabulary_prefix, $fetched_terms);
}

/**
 * Fetches the classes and properties of an external RDF vocabulary.
 *
 * @param $vocabulary_uri
 *   The namespace of the vocabulary to be fetched. Note most of the time this
 *   URI should end with / or #, e.g. http://rdfs.org/sioc/ns#
 * @param $vocabulary_prefix
 *   Prefix used system-wide for referring to this namespace.
 * @param $vocabulary_location
 *   URL of the vocabulary if the vocabulary namespace does not dereference and
 *   is not available at the namespace. Optionnal.
 * @return
 *   An array of fetched terms.
 */
function evoc_fetch_vocabulary($vocabulary_uri, $vocabulary_prefix, $vocabulary_location = NULL) {

  // Uses the vocabulary namespace URI if no specific location is given.
  $vocabulary_location = $vocabulary_location ? $vocabulary_location : $vocabulary_uri;
  module_load_include('inc', 'evoc', 'evoc.load_vocab');
  list($triples, $namespaces) = rdfx_fetch_rdf($vocabulary_uri, $vocabulary_prefix);
  $vocabulary = _rdfx_extract_schema($triples, $namespaces, $vocabulary_prefix, $vocabulary_uri);
  return $vocabulary;
}

Functions

Name	Description
evoc_fetch_vocabulary	Fetches the classes and properties of an external RDF vocabulary.
evoc_import_vocabulary
evoc_menu	Implements hook_menu().
evoc_rdf_namespaces	Implements hook_menu().