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<?php
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// $Id$
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/**
 * @file
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 * The core that allows content to be submitted to the site. Modules and
 * scripts may programmatically submit nodes using the usual form API pattern.
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 */

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/**
 * Node is not published.
 */
define('NODE_NOT_PUBLISHED', 0);

/**
 * Node is published.
 */
define('NODE_PUBLISHED', 1);

/**
 * Node is not promoted to front page.
 */
define('NODE_NOT_PROMOTED', 0);

/**
 * Node is promoted to front page.
 */
define('NODE_PROMOTED', 1);

/**
 * Node is not sticky at top of the page.
 */
define('NODE_NOT_STICKY', 0);

/**
 * Node is sticky at top of the page.
 */
define('NODE_STICKY', 1);

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/**
 * Nodes changed before this time are always marked as read.
 *
 * Nodes changed after this time may be marked new, updated, or read, depending
 * on their state for the current user. Defaults to 30 days ago.
 */
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define('NODE_NEW_LIMIT', REQUEST_TIME - 30 * 24 * 60 * 60);
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/**
 * Modules should return this value from hook_node_access() to allow access to a node.
 */
define('NODE_ACCESS_ALLOW', 'allow');

/**
 * Modules should return this value from hook_node_access() to deny access to a node.
 */
define('NODE_ACCESS_DENY', 'deny');

/**
 * Modules should return this value from hook_node_access() to not affect node access.
 */
define('NODE_ACCESS_IGNORE', NULL);

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/**
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 * Implement hook_help().
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 */
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function node_help($path, $arg) {
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  // Remind site administrators about the {node_access} table being flagged
  // for rebuild. We don't need to issue the message on the confirm form, or
  // while the rebuild is being processed.
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  if ($path != 'admin/reports/status/rebuild' && $path != 'batch' && strpos($path, '#') === FALSE
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      && user_access('access administration pages') && node_access_needs_rebuild()) {
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    if ($path == 'admin/reports/status') {
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      $message = t('The content access permissions need to be rebuilt.');
    }
    else {
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      $message = t('The content access permissions need to be rebuilt. Please visit <a href="@node_access_rebuild">this page</a>.', array('@node_access_rebuild' => url('admin/reports/status/rebuild')));
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    }
    drupal_set_message($message, 'error');
  }

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  switch ($path) {
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    case 'admin/help#node':
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      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('The Node module manages the creation, editing, deletion, settings, and display of all site content. For more information, see the online handbook entry for <a href="@node">Node module</a>.', array('@node' => 'http://drupal.org/handbook/modules/node')) . '</p>';
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      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<dl>';
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      $output .= '<dt>' . t('Creating content') . '</dt>';
      $output .= '<dd>' . t('When new content is created, the Node module records basic information about the content, including the author, date of creation, and the <a href="@content-type">Content type</a>. It also manages the <em>publishing options</em>, which define whether or not the content is published, promoted to the front page of the site, and/or sticky at the top of content lists. Default settings can be configured for each <a href="@content-type">type of content</a> on your site.', array('@content-type' => url('admin/structure/types'))) . '</dd>';
      $output .= '<dt>' . t('Creating custom content types') . '</dt>';
      $output .= '<dd>' . t('The Node module gives users with the <em>Administer content types</em> permission the ability to <a href="@content-new">create new content types</a> in addition to the default ones already configured. Creating custom content types allows you the flexibility to add <a href="@field">fields</a> and configure default settings that suit the differing needs of various site content.', array('@field' => url('admin/help/field'))) . '</dd>';
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      $output .= '<dt>' . t('Administering content') . '</dt>';
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      $output .= '<dd>' . t('The <a href="@content">Content administration page</a> allows you to review and bulk manage your site content.', array('@content' => url('admin/content'))) . '</dd>';
      $output .= '<dt>' . t('Creating revisions') . '</dt>';
      $output .= '<dd>' . t('The Node module also enables you to create multiple versions of any content, and revert to older versions using the <em>Revision information</em> settings.') . '</dd>';
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      $output .= '<dt>' . t('User permissions') . '</dt>';
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      $output .= '<dd>' . t('The Node module makes a number of permissions available for each content type, which can be set by role on the <a href="@permissions">permissions page</a>.', array('@permissions' => url('admin/settings/permissions'))) . '</dd>';
      $output .= '</dl>'; 
      return $output;
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    case 'admin/content':
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      // Return a non-null value so that the 'more help' link is shown.
      return ' ';
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    case 'admin/structure/types/add':
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      return '<p>' . t('Individual content types can have different fields, behaviors, and permissions assigned to them.') . '</p>';
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    case 'admin/structure/types/manage/' . $arg[3] . '/fields':
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      return '<p>' . t('This form allows you to add, edit, and arrange fields within the %type content type.', array('%type' => node_type_get_name($arg[3]))) . '</p>';
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    case 'admin/structure/types/manage/' . $arg[3] . '/display':
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      return '<p>' . t('This form allows you to configure how fields should be displayed when %type content is rendered in the following contexts.', array('%type' => node_type_get_name($arg[3]))) . '</p>';

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    case 'admin/structure/types/manage/' . $arg[3] . '/display/' . $arg[5]:
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      return '<p>' . t('This form allows you to configure how fields should be displayed when %type content is rendered in the following contexts.', array('%type' => node_type_get_name($arg[3]))) . '</p>';
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    case 'node/%/revisions':
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      return '<p>' . t('Revisions allow you to track differences between multiple versions of your content, and revert back to older versions.') . '</p>';
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    case 'node/%/edit':
      $node = node_load($arg[1]);
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      $type = node_type_get_type($node);
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      return (!empty($type->help) ? '<p>' . filter_xss_admin($type->help) . '</p>' : '');
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  }
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  if ($arg[0] == 'node' && $arg[1] == 'add' && $arg[2]) {
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    $type = node_type_get_type(str_replace('-', '_', $arg[2]));
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    return (!empty($type->help) ? '<p>' . filter_xss_admin($type->help) . '</p>' : '');
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  }
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}

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/**
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 * Implement hook_theme().
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 */
function node_theme() {
  return array(
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    'node' => array(
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      'render element' => 'elements',
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      'template' => 'node',
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    ),
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    'node_list' => array(
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      'variables' => array('items' => NULL, 'title' => NULL),
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    ),
    'node_search_admin' => array(
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      'render element' => 'form',
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    ),
    'node_filter_form' => array(
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      'render element' => 'form',
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      'file' => 'node.admin.inc',
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    ),
    'node_filters' => array(
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      'render element' => 'form',
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      'file' => 'node.admin.inc',
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    ),
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    'node_add_list' => array(
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      'variables' => array('content' => NULL),
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      'file' => 'node.pages.inc',
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    ),
    'node_form' => array(
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      'render element' => 'form',
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      'file' => 'node.pages.inc',
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    ),
    'node_preview' => array(
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      'variables' => array('node' => NULL),
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      'file' => 'node.pages.inc',
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    ),
    'node_log_message' => array(
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      'variables' => array('log' => NULL),
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    ),
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    'node_admin_overview' => array(
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      'variables' => array('name' => NULL, 'type' => NULL),
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    ),
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  );
}

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/**
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 * Implement hook_cron().
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 */
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function node_cron() {
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  db_delete('history')
    ->condition('timestamp', NODE_NEW_LIMIT, '<')
    ->execute();
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}

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/**
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 * Implement hook_entity_info().
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 */
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function node_entity_info() {
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  $return = array(
    'node' => array(
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      'label' => t('Node'),
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      'controller class' => 'NodeController',
      'base table' => 'node',
      'revision table' => 'node_revision',
      'fieldable' => TRUE,
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      'object keys' => array(
        'id' => 'nid',
        'revision' => 'vid',
        'bundle' => 'type',
      ),
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      'bundle keys' => array(
        'bundle' => 'type',
      ),
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      // Node.module handles its own caching.
      // 'cacheable' => FALSE,
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      'bundles' => array(),
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    ),
  );
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  // Bundles must provide a human readable name so we can create help and error
  // messages, and the path to attach Field admin pages to.
  foreach (node_type_get_names() as $type => $name) {
    $return['node']['bundles'][$type] = array(
      'label' => $name,
      'admin' => array(
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        'path' => 'admin/structure/types/manage/%node_type',
        'real path' => 'admin/structure/types/manage/' . str_replace('_', '-', $type),
        'bundle argument' => 4,
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        'access arguments' => array('administer content types'),
      ),
    );
  }
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  return $return;
}


/**
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 * Implement hook_field_build_modes().
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 */
function node_field_build_modes($obj_type) {
  $modes = array();
  if ($obj_type == 'node') {
    $modes = array(
      'teaser' => t('Teaser'),
      'full' => t('Full node'),
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      'rss' => t('RSS'),
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    );
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    // Search integration is provided by node.module, so search-related
    // build-modes for nodes are defined here and not in search.module.
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    if (module_exists('search')) {
      $modes += array(
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        'search_index' => t('Search Index'),
        'search_result' => t('Search Result'),
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      );
    }
  }
  return $modes;
}

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/**
 * Gather a listing of links to nodes.
 *
 * @param $result
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 *   A DB result object from a query to fetch node entities. If your query
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 *   joins the <code>node_comment_statistics</code> table so that the
 *   <code>comment_count</code> field is available, a title attribute will
 *   be added to show the number of comments.
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 * @param $title
 *   A heading for the resulting list.
 *
 * @return
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 *   An HTML list suitable as content for a block, or FALSE if no result can
 *   fetch from DB result object.
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 */
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function node_title_list($result, $title = NULL) {
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  $items = array();
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  $num_rows = FALSE;
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  foreach ($result as $node) {
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    $items[] = l($node->title, 'node/' . $node->nid, !empty($node->comment_count) ? array('attributes' => array('title' => format_plural($node->comment_count, '1 comment', '@count comments'))) : array());
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    $num_rows = TRUE;
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  }

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  return $num_rows ? theme('node_list', array('items' => $items, 'title' => $title)) : FALSE;
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}

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/**
 * Format a listing of links to nodes.
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 *
 * @ingroup themeable
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 */
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function theme_node_list($variables) {
  return theme('item_list', $variables);
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}

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/**
 * Update the 'last viewed' timestamp of the specified node for current user.
 */
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function node_tag_new($nid) {
  global $user;

  if ($user->uid) {
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    db_merge('history')
      ->key(array(
        'uid' => $user->uid,
        'nid' => $nid,
      ))
      ->fields(array('timestamp' => REQUEST_TIME))
      ->execute();
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  }
}

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/**
 * Retrieves the timestamp at which the current user last viewed the
 * specified node.
 */
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function node_last_viewed($nid) {
  global $user;
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  static $history;
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  if (!isset($history[$nid])) {
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    $history[$nid] = db_query("SELECT timestamp FROM {history} WHERE uid = :uid AND nid = :nid", array(':uid' => $user->uid, ':nid' => $nid))->fetchObject();
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  }

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  return (isset($history[$nid]->timestamp) ? $history[$nid]->timestamp : 0);
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}

/**
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 * Decide on the type of marker to be displayed for a given node.
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 *
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 * @param $nid
 *   Node ID whose history supplies the "last viewed" timestamp.
 * @param $timestamp
 *   Time which is compared against node's "last viewed" timestamp.
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 * @return
 *   One of the MARK constants.
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 */
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function node_mark($nid, $timestamp) {
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  global $user;
  static $cache;

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  if (!$user->uid) {
    return MARK_READ;
  }
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  if (!isset($cache[$nid])) {
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    $cache[$nid] = node_last_viewed($nid);
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  }
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  if ($cache[$nid] == 0 && $timestamp > NODE_NEW_LIMIT) {
    return MARK_NEW;
  }
  elseif ($timestamp > $cache[$nid] && $timestamp > NODE_NEW_LIMIT) {
    return MARK_UPDATED;
  }
  return MARK_READ;
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}

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/**
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 * Extract the type name.
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 *
 * @param $node
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 *   Either a string or object, containing the node type information.
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 *
 * @return
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 *   Node type of the passed in data.
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 */
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function _node_extract_type($node) {
  return is_object($node) ? $node->type : $node;
}
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/**
 * Returns a list of all the available node types.
 *
 * @return
 *   An array of node types, keyed by the type.
 * @see node_type_get_type()
 */
function node_type_get_types() {
  return _node_types_build()->types;
}

/**
 * Returns the node type of the passed node or node type string.
 *
 *@param $node
 *   A node object or string that indicates the node type to return.
 * @return
 *   A single node type, as an object or FALSE if the node type is not found.
 *   The node type is an array with following content:
 *
 *   @code
 *   array(
 *     'type' => 'Machine readable type name',
 *     'name' => 'Name of the node type',
 *     'base' => 'Indicates to which module this node type belongs',
 *     'description' => 'Description of the node type',
 *     // ...
 *   )
 *   @endcode
 */
function node_type_get_type($node) {
  $type = _node_extract_type($node);
  $types = _node_types_build()->types;
  return isset($types[$type]) ? $types[$type] : FALSE;
}

/**
 * Returns the node type base of the passed node or node type string.
 *
 * The base indicates which module implement this node type and is used to
 * execute node type specific hooks.
 *
 * @see node_invoke()
 *
 * @param $node
 *   A node object or string that indicates the node type to return.
 * @return
 *   The node type base or FALSE if the node type is not found.
 */
function node_type_get_base($node) {
  $type = _node_extract_type($node);
  $types = _node_types_build()->types;
  return isset($types[$type]) && isset($types[$type]->base) ? $types[$type]->base : FALSE;
}

/**
 * Returns a list of available node names.
 *
 * @return
 *   An array of node type names, keyed by the type.
 */
function node_type_get_names() {
  return _node_types_build()->names;
}

/**
 * Returns the node type name of the passed node or node type string.
 *
 * @param $node
 *   A node object or string that indicates the node type to return.
 *
 * @return
 *   The node type name or FALSE if the node type is not found.
 */
function node_type_get_name($node) {
  $type = _node_extract_type($node);
  $types = _node_types_build()->names;
  return isset($types[$type]) ? $types[$type] : FALSE;
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}

/**
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 * Resets the database cache of node types.
 *
 * All new or non-modified module-defined node types are saved to the database.
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 */
function node_types_rebuild() {
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  // Reset and load updated node types.
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  drupal_static_reset('_node_types_build');
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  foreach (node_type_get_types() as $type => $info) {
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    if (!empty($info->is_new)) {
      node_type_save($info);
    }
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    if (!empty($info->disabled)) {
      node_type_delete($info->type);
    }
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  }
}

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/**
 * Menu argument loader; Load a node type by string.
 *
 * @param $name
 *   The machine-readable name of a node type to load; having '_' replaced with
 *   '-'.
 *
 * @return
 *   A node type object or FALSE if $name does not exist.
 */
function node_type_load($name) {
  return node_type_get_type(strtr($name, array('-' => '_')));
}

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/**
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 * Saves a node type to the database.
 *
 * @param $info
 *   The node type to save, as an object.
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 *
 * @return
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 *   Status flag indicating outcome of the operation.
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 */
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function node_type_save($info) {
  $is_existing = FALSE;
  $existing_type = !empty($info->old_type) ? $info->old_type : $info->type;
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  $is_existing = (bool) db_query_range('SELECT 1 FROM {node_type} WHERE type = :type', 0, 1, array(':type' => $existing_type))->fetchField();
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  $type = node_type_set_defaults($info);

  $fields = array(
    'type' => (string) $type->type,
    'name' => (string) $type->name,
    'base' => (string) $type->base,
    'has_title' => (int) $type->has_title,
    'title_label' => (string) $type->title_label,
    'has_body' => (int) $type->has_body,
    'body_label' => (string) $type->body_label,
    'description' => (string) $type->description,
    'help' => (string) $type->help,
    'custom' => (int) $type->custom,
    'modified' => (int) $type->modified,
    'locked' => (int) $type->locked,
  );
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  if ($is_existing) {
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    db_update('node_type')
      ->fields($fields)
      ->condition('type', $existing_type)
      ->execute();
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    if (!empty($type->old_type) && $type->old_type != $type->type) {
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      field_attach_rename_bundle('node', $type->old_type, $type->type);
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    }
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    node_configure_fields($type);
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    module_invoke_all('node_type_update', $type);
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    $status = SAVED_UPDATED;
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  }
  else {
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    $fields['orig_type'] = (string) $type->orig_type;
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    db_insert('node_type')
      ->fields($fields)
      ->execute();
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    field_attach_create_bundle('node', $type->type);
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    node_configure_fields($type);
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    module_invoke_all('node_type_insert', $type);
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    $status = SAVED_NEW;
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  }
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  // Clear the node type cache.
  drupal_static_reset('_node_types_build');

  return $status;
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}
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/**
 * Manage the field(s) for a node type.
 *
 * Currently, the node module manages a single Field API field,
 * 'body'.  If $type->has_body is true, this function ensures the
 * 'body' field exists and creates an instance of it for the bundle
 * $type->type (e.g. 'page', 'story', ...).  If $type->has_body is
 * false, this function removes the instance (if it exists) for the
 * 'body' field on $type->type.
 */
function node_configure_fields($type) {
   // Add or remove the body field, as needed.
  $field = field_info_field('body');
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  $instance = field_info_instance('node', 'body', $type->type);
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  if ($type->has_body) {
    if (empty($field)) {
      $field = array(
        'field_name' => 'body',
        'type' => 'text_with_summary',
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        'translatable' => TRUE,
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      );
      $field = field_create_field($field);
    }
    if (empty($instance)) {
      $instance = array(
        'field_name' => 'body',
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        'object_type' => 'node',
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        'bundle' => $type->type,
        'label' => $type->body_label,
        'widget_type' => 'text_textarea_with_summary',
        'settings' => array('display_summary' => TRUE),

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        // Define default formatters for the teaser and full view.
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        'display' => array(
          'full' => array(
            'label' => 'hidden',
            'type' => 'text_default',
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          ),
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          'teaser' => array(
            'label' => 'hidden',
            'type' => 'text_summary_or_trimmed',
          ),
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        ),
      );
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      field_create_instance($instance);
    }
    else {
      $instance['label'] = $type->body_label;
      $instance['settings']['display_summary'] = TRUE;
      field_update_instance($instance);
    }
  }
  elseif (!empty($instance)) {
    field_delete_instance($instance);
  }

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  if ($type->has_title) {
    // Add the title field if not present.
    $field = field_info_field('title');
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    $instance = field_info_instance('node', 'title', $type->type);
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    if (empty($field)) {
      $field = array(
        'field_name' => 'title',
        'type' => 'text',
      );
      $field = field_create_field($field);
    }
    if (empty($instance)) {
      $weight = -5;
      $instance = array(
        'field_name' => 'title',
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        'object_type' => 'node',
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        'bundle' => $type->type,
        'label' => $type->title_label,
        'widget_type' => 'text',
        'widget' => array(
          'weight' => $weight,
        ),
        'required' => TRUE,
        'locked' => TRUE,
        'display' => array(
          'full' => array(
            'label' => 'hidden',
            'type' => 'text_default',
            'weight' => $weight,
          ),
          'teaser' => array(
            'label' => 'hidden',
            'type' => 'text_default',
            'weight' => $weight,
          ),
        ),
      );
      field_create_instance($instance);
    }
    else {
      $instance['label'] = $type->title_label;
      field_update_instance($instance);
    }
  }
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}

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/**
 * Deletes a node type from the database.
 *
 * @param $type
 *   The machine-readable name of the node type to be deleted.
 */
function node_type_delete($type) {
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  $info = node_type_get_type($type);
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  db_delete('node_type')
    ->condition('type', $type)
    ->execute();
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  module_invoke_all('node_type_delete', $info);
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  // Clear the node type cache.
  drupal_static_reset('_node_types_build');
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}

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/**
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 * Updates all nodes of one type to be of another type.
 *
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 * @param $old_type
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 *   The current node type of the nodes.
 * @param $type
 *   The new node type of the nodes.
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 *
 * @return
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 *   The number of nodes whose node type field was modified.
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 */
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function node_type_update_nodes($old_type, $type) {
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  return db_update('node')
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    ->fields(array('type' => $type))
    ->condition('type', $old_type)
    ->execute();
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}
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/**
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 * Builds and returns the list of available node types.
 *
 * The list of types is built by querying hook_node_info() in all modules, and
 * by comparing this information with the node types in the {node_type} table.
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 *
 */
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function _node_types_build() {
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  $_node_types = &drupal_static(__FUNCTION__);
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  if (is_object($_node_types)) {
    return $_node_types;
  }
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  $_node_types = (object)array('types' => array(), 'names' => array());
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  $info_array = module_invoke_all('node_info');
  foreach ($info_array as $type => $info) {
    $info['type'] = $type;
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    $_node_types->types[$type] = node_type_set_defaults($info);
    $_node_types->names[$type] = $info['name'];
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  }
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  $type_result = db_select('node_type', 'nt')
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    ->addTag('translatable')
    ->addTag('node_type_access')
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    ->fields('nt')
    ->orderBy('nt.type', 'ASC')
    ->execute();
  foreach ($type_result as $type_object) {
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    // Check for node types from disabled modules and mark their types for removal.
    // Types defined by the node module in the database (rather than by a separate
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    // module using hook_node_info) have a base value of 'node_content'. The isset()
    // check prevents errors on old (pre-Drupal 7) databases.
    if (isset($type_object->base) && $type_object->base != 'node_content' && empty($info_array[$type_object->type])) {
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      $type_object->disabled = TRUE;
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    }
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    if (!isset($_node_types->types[$type_object->type]) || $type_object->modified) {
      $_node_types->types[$type_object->type] = $type_object;
      $_node_types->names[$type_object->type] = $type_object->name;
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      if ($type_object->type != $type_object->orig_type) {
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        unset($_node_types->types[$type_object->orig_type]);
        unset($_node_types->names[$type_object->orig_type]);
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      }
    }
  }

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  asort($_node_types->names);
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  return $_node_types;
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}

/**
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 * Set the default values for a node type.
 *
 * The defaults are for a type defined through hook_node_info().
 * When populating a custom node type $info should have the 'custom'
 * key set to 1.
 *
 * @param $info
 *   An object or array containing values to override the defaults.
 *
 * @return
 *  A node type object.
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 */
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function node_type_set_defaults($info = array()) {
  static $type;

  if (!isset($type)) {
    $type = new stdClass();
    $type->type = '';
    $type->name = '';
    $type->base = '';
    $type->description = '';
    $type->help = '';
    $type->has_title = 1;
    $type->has_body = 1;
    $type->title_label = t('Title');
    $type->body_label = t('Body');
    $type->custom = 0;
    $type->modified = 0;
    $type->locked = 1;
    $type->is_new = 1;
  }

  $new_type = clone $type;
  $info = (array) $info;
  foreach ($info as $key => $data) {
    $new_type->$key = $data;
  }
  // If the type has no title or body, set an empty label.
  if (!$new_type->has_title) {
    $new_type->title_label = '';
  }
  if (!$new_type->has_body) {
    $new_type->body_label = '';
  }
  $new_type->orig_type = isset($info['type']) ? $info['type'] : '';

  return $new_type;
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}
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/**
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 * Implements hook_rdf_mapping().
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 */
function node_rdf_mapping() {
  return array(
    array(
      'type' => 'node',
      'bundle' => RDF_DEFAULT_BUNDLE,
      'mapping' => array(
        'rdftype' => array('sioc:Item', 'foaf:Document'),
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        'title' => array(
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          'predicates' => array('dc:title'),
        ),
        'created' => array(
          'predicates' => array('dc:date', 'dc:created'),
          'datatype' => 'xsd:dateTime',
          'callback' => 'date_iso8601',
        ),
        'changed' => array(
          'predicates' => array('dc:modified'),
        ),
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        'body' => array(
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          'predicates' => array('content:encoded'),
        ),
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        'uid' => array(
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          'predicates' => array('sioc:has_creator'),
        ),
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        'name' => array(
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          'predicates' => array('foaf:name'),
        ),
      ),
    ),
  );
}

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/**
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 * Determine whether a node hook exists.
 *
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 * @param $node
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 *   A node object or a string containing the node type.
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 * @param $hook
 *   A string containing the name of the hook.
 * @return
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 *   TRUE if the $hook exists in the node type of $node.
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 */
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function node_hook($node, $hook) {
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  $base = node_type_get_base($node);
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  return module_hook($base, $hook);
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}

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/**
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 * Invoke a node hook.
 *
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 * @param $node
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 *   A node object or a string containing the node type.
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 * @param $hook
 *   A string containing the name of the hook.
 * @param $a2, $a3, $a4
 *   Arguments to pass on to the hook, after the $node argument.
 * @return
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 *   The returned value of the invoked hook.
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 */
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function node_invoke($node, $hook, $a2 = NULL, $a3 = NULL, $a4 = NULL) {
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  if (node_hook($node, $hook)) {
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    $base = node_type_get_base($node);
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    $function = $base . '_' . $hook;
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    return ($function($node, $a2, $a3, $a4));
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  }
}

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/**
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 * Load node entities from the database.
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 *
 * This function should be used whenever you need to load more than one node
 * from the database. Nodes are loaded into memory and will not require
 * database access if loaded again during the same page request.
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 *
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 * @see entity_load()
 *
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 * @param $nids
 *   An array of node IDs.
 * @param $conditions
 *   An array of conditions on the {node} table in the form 'field' => $value.
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 * @param $reset
 *   Whether to reset the internal node_load cache.
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 *
 * @return
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 *   An array of node objects indexed by nid.
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 */
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function node_load_multiple($nids = array(), $conditions = array(), $reset = FALSE) {
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  return entity_load('node', $nids, $conditions, $reset);
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}

/**
 * Load a node object from the database.
 *
 * @param $nid
 *   The node ID.
 * @param $vid
 *   The revision ID.
 * @param $reset
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 *   Whether to reset the node_load_multiple cache.
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 *
 * @return
 *   A fully-populated node object.
 */
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function node_load($nid = NULL, $vid = NULL, $reset = FALSE) {
  $nids = (isset($nid) ? array($nid) : array());
  $conditions = (isset($vid) ? array('vid' => $vid) : array());
  $node = node_load_multiple($nids, $conditions, $reset);
  return $node ? reset($node) : FALSE;
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}

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/**
 * Perform validation checks on the given node.
 */
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function node_validate($node, $form = array()) {
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  $type = node_type_get_type($node);
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  if (isset($node->nid) && (node_last_changed($node->nid) > $node->changed)) {
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    form_set_error('changed', t('The content on this page has either been modified by another user, or you have already submitted modifications using this form. As a result, your changes cannot be saved.'));
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  }

  if (user_access('administer nodes')) {
    // Validate the "authored by" field.
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    if (!empty($node->name) && !($account = user_load_by_name($node->name))) {
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      // The use of empty() is mandatory in the context of usernames
      // as the empty string denotes the anonymous user. In case we
      // are dealing with an anonymous user we set the user ID to 0.
      form_set_error('name', t('The username %name does not exist.', array('%name' => $node->name)));
    }

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    // Validate the "authored on" field.
    if (!empty($node->date) && strtotime($node->date) === FALSE) {
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      form_set_error('date', t('You have to specify a valid date.'));
    }
  }

  // Do node-type-specific validation checks.
  node_invoke($node, 'validate', $form);
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  module_invoke_all('node_validate', $node, $form);
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}

/**
 * Prepare node for save and allow modules to make changes.
 */
function node_submit($node) {
  global $user;

  if (user_access('administer nodes')) {
    // Populate the "authored by" field.
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    if ($account = user_load_by_name($node->name)) {
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      $node->uid = $account->uid;
    }
    else {
      $node->uid = 0;
    }
  }
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  $node->created = !empty($node->date) ? strtotime($node->date) : REQUEST_TIME;
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  $node->validated = TRUE;

  return $node;
}

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/**
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 * Save changes to a node or add a new node.
 *
 * @param $node
 *   The $node object to be saved. If $node->nid is
 *   omitted (or $node->is_new is TRUE), a new node will be added.
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 */
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function node_save($node) {
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  $transaction = db_transaction();
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  try {
    field_attach_presave('node', $node);
    // Let modules modify the node before it is saved to the database.
    module_invoke_all('node_presave', $node);
    global $user;
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    if (!isset($node->is_new)) {
      $node->is_new = empty($node->nid);
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    }
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    // Apply filters to some default node fields:
    if ($node->is_new) {
      // Insert a new node.
      $node->is_new = TRUE;

      // When inserting a node, $node->log must be set because
      // {node_revision}.log does not (and cannot) have a default
      // value. If the user does not have permission to create
      // revisions, however, the form will not contain an element for
      // log so $node->log will be unset at this point.
      if (!isset($node->log)) {
        $node->log = '';
      }
    }
    elseif (!empty($node->revision)) {
      $node->old_vid = $node->vid;
      unset($node->vid);
    }
    else {
      // When updating a node, avoid clobbering an existing log entry with an empty one.
      if (empty($node->log)) {
        unset($node->log);
      }
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    }
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    // Set some required fields:
    if (empty($node->created)) {
      $node->created = REQUEST_TIME;
    }
    // The changed timestamp is always updated for bookkeeping purposes (revisions, searching, ...)
    $node->changed = REQUEST_TIME;
  
    $node->timestamp = REQUEST_TIME;
    $update_node = TRUE;

    // When converting the title property to fields we preserved the {node}.title
    // db column for performance, setting the default language value into this
    // column. After this we restore the field data structure to the previous node
    // title field.
    $title_field = $node->title;
    $langcode = FIELD_LANGUAGE_NONE;
    $node->title = $title_field[$langcode][0]['value'];

    // Generate the node table query and the node_revisions table query.
    if ($node->is_new) {
      drupal_write_record('node', $node);
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      _node_save_revision($node, $user->uid);
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      $op = 'insert';
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    }
    else {
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      drupal_write_record('node', $node, 'nid');
      if (!empty($node->revision)) {
        _node_save_revision($node, $user->uid);
      }
      else {
        _node_save_revision($node, $user->uid, 'vid');
        $update_node = FALSE;
      }
      $op = 'update';
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    }
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    if ($update_node) {
      db_update('node')
        ->fields(array('vid' => $node->vid))
        ->condition('nid', $node->nid)
        ->execute();
    }
  
    // Restore the title field data structure after db storage.
    $node->title = $title_field;
  
    // Call the node specific callback (if any). This can be
    // node_invoke($node, 'insert') or
    // node_invoke($node, 'update').
    node_invoke($node, $op);
  
    // Save fields.
    $function = "field_attach_$op";
    $function('node', $node);
  
    module_invoke_all('node_' . $op, $node);
  
    // Update the node access table for this node.
    node_access_acquire_grants($node);
  
    // Clear internal properties.
    unset($node->is_new);
  
    // Clear the page and block caches.
    cache_clear_all();
  
    // Ignore slave server temporarily to give time for the
    // saved node to be propagated to the slave.
    db_ignore_slave();