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<?php

/**
 * @file
 * A dummy module for testing node related hooks.
 *
 * This is a dummy module that implements node related hooks to test API
 * interaction with the Node module.
 */

/**
 * Implements hook_node_load().
 */
function node_test_node_load($nodes, $types) {
  // Add properties to each loaded node which record the parameters that were
  // passed in to this function, so the tests can check that (a) this hook was
  // called, and (b) the parameters were what we expected them to be.
  $nids = array_keys($nodes);
  ksort($nids);
  sort($types);
  foreach ($nodes as $node) {
    $node->node_test_loaded_nids = $nids;
    $node->node_test_loaded_types = $types;
  }
}

/**
 * Implements hook_node_view().
 */
function node_test_node_view($node, $view_mode) {
  if ($view_mode == 'rss') {
    // Add RSS elements and namespaces when building the RSS feed.
    $node->rss_elements[] = array(
      'key' => 'testElement',
      'value' => t('Value of testElement RSS element for node !nid.', array('!nid' => $node->nid)),
    );
    $node->rss_namespaces['xmlns:drupaltest'] = 'http://example.com/test-namespace';

    // Add content that should be displayed only in the RSS feed.
    $node->content['extra_feed_content'] = array(
      '#markup' => '<p>' . t('Extra data that should appear only in the RSS feed for node !nid.', array('!nid' => $node->nid)) . '</p>',
      '#weight' => 10,
    );
  }

  if ($view_mode != 'rss') {
    // Add content that should NOT be displayed in the RSS feed.
    $node->content['extra_non_feed_content'] = array(
      '#markup' => '<p>' . t('Extra data that should appear everywhere except the RSS feed for node !nid.', array('!nid' => $node->nid)) . '</p>',
    );
  }
}

/**
 * Implements hook_node_grants().
 */
function node_test_node_grants($account, $op) {
  // Give everyone full grants so we don't break other node tests.
  // Our node access tests asserts three realms of access.
  // See testGrantAlter().
  return array(
    'test_article_realm' => array(1),
    'test_page_realm' => array(1),
    'test_alter_realm' => array(2),
  );
}

/**
 * Implements hook_node_access_records().
 */
function node_test_node_access_records($node) {
  // Return nothing when testing for empty responses.
  if (!empty($node->disable_node_access)) {
    return;
  }
  $grants = array();
  if ($node->type == 'article') {
    // Create grant in arbitrary article_realm for article nodes.
    $grants[] = array(
      'realm' => 'test_article_realm',
      'gid' => 1,
      'grant_view' => 1,
      'grant_update' => 0,
      'grant_delete' => 0,
      'priority' => 0,
    );
  }
  elseif ($node->type == 'page') {
    // Create grant in arbitrary page_realm for page nodes.
    $grants[] = array(
      'realm' => 'test_page_realm',
      'gid' => 1,
      'grant_view' => 1,
      'grant_update' => 0,
      'grant_delete' => 0,
      'priority' => 0,
    );
  }
  return $grants;
}

/**
 * Implements hook_node_access_records_alter().
 */
function node_test_node_access_records_alter(&$grants, $node) {
  if (!empty($grants)) {
    foreach ($grants as $key => $grant) {
      // Alter grant from test_page_realm to test_alter_realm and modify the gid.
      if ($grant['realm'] == 'test_page_realm' && $node->promote) {
        $grants[$key]['realm'] = 'test_alter_realm';
        $grants[$key]['gid'] = 2;
      }
    }
  }
}

/**
 * Implements hook_node_grants_alter().
 */
function node_test_node_grants_alter(&$grants, $account, $op) {
  // Return an empty array of grants to prove that we can alter by reference.
  $grants = array();
}

/**
 * Implements hook_node_presave().
 */
function node_test_node_presave($node) {
  if ($node->title == 'testing_node_presave') {
    // Sun, 19 Nov 1978 05:00:00 GMT
    $node->created = 280299600;
    // Drupal 1.0 release.
    $node->changed = 979534800;
  }
  // Determine changes.
  if (!empty($node->original) && $node->original->title == 'test_changes') {
    if ($node->original->title != $node->title) {
      $node->title .= '_presave';
    }
  }
}

/**
 * Implements hook_node_update().
 */
function node_test_node_update($node) {
  // Determine changes on update.
  if (!empty($node->original) && $node->original->title == 'test_changes') {
    if ($node->original->title != $node->title) {
      $node->title .= '_update';
    }
  }
}

/**
 * Implements hook_entity_view_mode_alter().
 */
function node_test_entity_view_mode_alter(&$view_mode, $context) {
  // Only alter the view mode if we are on the test callback.
  if ($change_view_mode = variable_get('node_test_change_view_mode', '')) {
    $view_mode = $change_view_mode;
  }
}