islandora/islandora_collection/islandora_collection.module

<?php

/**
 * @file
 * This is the new Islandora Collection module.
 */

define('ISLANDORA_COLLECTION_CONTENT_TYPE', 'islandora_collection');
define('ISLANDORA_COLLECTION_RDF_TYPE', 'islandora:collection');

/**
 * Implements hook_views_api().
 */
function islandora_collection_views_api() {
  return array(
    'api' => 3.0,
    'path' => drupal_get_path('module', 'islandora_collection') . '/include',
  );
}

/**
 * Implements hook_node_info().
 */
function islandora_collection_node_info() {
  return array(
    ISLANDORA_COLLECTION_CONTENT_TYPE => array(
      'name' => t("Collection"),
      'base' => ISLANDORA_COLLECTION_CONTENT_TYPE,
      'description' => t("A Drupal node modeling a pcdm:Collection."),
    ),
  );
}

/**
 * Implements hook_form().
 */
function islandora_collection_form($node, array &$form_state) {
  return node_content_form($node, $form_state);
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function islandora_collection_form_islandora_collection_node_form_alter(&$form, array &$form_state, $form_id) {
  $node = $form_state['node'];

  // Add a collection picker if node is new (e.g. this is an insert form).
  if (!isset($node->nid) || isset($node->is_new)) {
    // Construct list of options from db and a default.
    $default = array('' => t('Fedora Root'));
    $from_db = db_select('node', 'n')
        ->fields('n', array('uuid', 'title'))
        ->condition('n.type', ISLANDORA_COLLECTION_CONTENT_TYPE)
        ->execute()
        ->fetchAllKeyed();
    $options = $default + $from_db;

    // Add the select to the form.
    $form['parent_collection'] = array(
      '#type' => 'select',
      '#title' => t('Parent Collection'),
      '#description' => t('Select the parent collection to add this to.  Select "Fedora Root" if you want it to be a top-level collection'),
      '#options' => $options,
      '#default_value' => '',
      '#weight' => -4,
    );

    // Keep title on top.
    $form['title']['#weight'] = -5;

    // Tack on a custom submit handler to attach data on the entity for use
    // later on in the post action hooks.
    array_unshift($form['#submit'], 'islandora_collection_add_parent_uuid');
  }
}

/**
 * Custom submit handler to pass along parent uuid.
 *
 * @param array $form
 *   Drupal form.
 * @param array $form_state
 *   Drupal form state.
 */
function islandora_collection_add_parent_uuid(array $form, array &$form_state) {
  $node = $form_state['node'];
  $node->parent_collection = "";
  if (isset($form_state['parent_collection']['#value'])) {
    $node->parent_collection = $form_state['parent_collection']['#value'];
  }
}

/**
 * Implements hook_rdf_mapping().
 */
function islandora_collection_rdf_mapping() {
  module_load_include('inc', 'islandora', 'include/rdf_mapping');
  $rdf_types = array(
    ISLANDORA_PCDM_COLLECTION_RDF_TYPE,
    ISLANDORA_COLLECTION_RDF_TYPE,
  );
  return islandora_get_default_rdf_mapping(ISLANDORA_COLLECTION_CONTENT_TYPE, $rdf_types);
}

/**
 * Implements hook_node_postinsert().
 */
function islandora_collection_node_postinsert($node) {
  module_load_include('inc', 'islandora', 'include/utils');
  if (islandora_ignore_hooks()) {
    return;
  }

  // Exit early if it's not a collection.
  if (strcmp($node->type, ISLANDORA_COLLECTION_CONTENT_TYPE) != 0) {
    return;
  }

  $parent_collection = $node->parent_collection;
  $nodes = entity_uuid_load('node', array($node->uuid));

  // Exit early if the node never was successfully inserted in the database.
  if (empty($nodes)) {
    return;
  }

  $node = array_pop($nodes);
  $url = "http://127.0.0.1:8181/cxf/islandora/collection/$parent_collection";

  // Don't forget the trailing slash.
  httprl_request($url,
                 array(
                   'method' => 'POST',
                   'headers' => array(
                     'Content-Type' => 'application/json',
                   ),
                   'data' => json_encode($node),
                 ));
  $response = httprl_send_request();
}

/**
 * Implements hook_node_postupdate().
 */
function islandora_collection_node_postupdate($node) {
  module_load_include('inc', 'islandora', 'include/utils');
  if (islandora_ignore_hooks()) {
    return;
  }

  // Exit early if it's not a collection.
  if (strcmp($node->type, ISLANDORA_COLLECTION_CONTENT_TYPE) != 0) {
    return;
  }

  // Unfortunately, there's no way to tell if the db transaction got rolled
  // back in this hook, so we'll default to doing it anyway so as not to miss
  // any updates. Open to suggestions on this one.  But we gotta do post_action
  // hooks otherwise things can get crazy if the db transaction hasn't closed.
  $nodes = entity_uuid_load('node', array($node->uuid));

  // Exit early if something has gone wrong and there's no node info.
  if (empty($nodes)) {
    return;
  }

  $node = array_pop($nodes);
  $uuid = $node->uuid;
  httprl_request("http://127.0.0.1:8181/cxf/islandora/collection/$uuid",
                 array(
                   'method' => 'PUT',
                   'headers' => array(
                     'Content-Type' => 'application/json',
                   ),
                   'data' => json_encode($node),
                 ));
  $response = httprl_send_request();
}

/**
 * Implements hook_node_postdelete().
 */
function islandora_collection_node_postdelete($node) {
  module_load_include('inc', 'islandora', 'include/utils');
  if (islandora_ignore_hooks()) {
    return;
  }

  // Exit early if it's not a collection.
  if (strcmp($node->type, ISLANDORA_COLLECTION_CONTENT_TYPE) != 0) {
    return;
  }

  $uuid = $node->uuid;
  httprl_request("http://127.0.0.1:8181/cxf/islandora/collection/$uuid",
                 array(
                   'method' => 'DELETE',
                 ));
  $response = httprl_send_request();
}