Hook Presave and Delete

hook-presave-delete.module

<?php
/**
 * @file
 * Field DOS Feed Status Module file
 * 
 * This module allows site administrators to send a stock warning
 * email to a specified user or users through the admin interface.
 * Administrators can configure the default email including token replacement.
 */
//define('EXHIBIT_ITEMS_MODIFICATION_DATE', 'none');

/**
 * Implements hook_help().
 */
function field_dos_feed_status_help($path, $arg) {
  if ($path == 'admin/help#field_dos_feed_status') {
    return t('Field DOS feed status maintains timestamps for the last modification (add/delete/update) of content types and taxonomies.');
  }
}

/**
 * Implements hook_menu().
 */
function field_dos_feed_status_menu() {
  $items = array();
  $items['api/feed-status.json'] = array(
      'access callback'   => true, // available to all
      'page callback'     => 'field_dos_feed_status_menu_object', // defined below
      'delivery callback' => 'drupal_json_output' 
  );
  return $items;
}

/**
 * Implements hook_node_presave().
 */
function field_dos_feed_status_node_presave($node) {
  switch ($node->type) {
    case 'amenity':
      variable_set('amenities_timestamp', time());
      break;
    case 'behind_scenes_item':
      variable_set('behind_scenes_items_timestamp', time());
      break;  
    case 'collection_highlight':
      variable_set('collection_highlights_timestamp', time());
      break;
    case 'exhibit_item':
      variable_set('exhibit_items_timestamp', time());
      break;
    case 'schedule_item':
      variable_set('schedule_items_timestamp', time());
      break;
    case 'touchscreen_station':
      variable_set('touchscreen_stations_timestamp', time());
      break;
    case 'itinerary':
      variable_set('itineraries_timestamp', time());
      break;  
    default:
      break;
  }
}

/**
 * Implements hook_node_delete().
 */
function field_dos_feed_status_node_delete($node) {
  switch ($node->type) {
    case 'amenity':
      variable_set('amenities_timestamp', time());
      break;
    case 'behind_scenes_item':
      variable_set('behind_scenes_items_timestamp', time());
      break;  
    case 'collection_highlight':
      variable_set('collection_highlights_timestamp', time());
      break;
    case 'exhibit_item':
      variable_set('exhibit_items_timestamp', time());
      break;
    case 'schedule_item':
      variable_set('schedule_items_timestamp', time());
      break;
    case 'touchscreen_station':
      variable_set('touchscreen_stations_timestamp', time());
      break;
    case 'itinerary':
      variable_set('itineraries_timestamp', time());
      break;  
    default:
      break;
  }
}

/**
 * Implements hook_taxonomy_term_presave().
 */
function field_dos_feed_status_taxonomy_term_presave($term) {
  switch ($term->vocabulary_machine_name) {
    case 'amenity_category':
      variable_set('amenity_categories_timestamp', time());
      break;
    case 'location':
      variable_set('locations_timestamp', time());
      break;
      default:
      # code...
      break;
  }
}

/**
 * Implements hook_taxonomy_term_delete().
 */
function field_dos_feed_status_taxonomy_term_delete($term) {
  switch ($term->vocabulary_machine_name) {
    case 'amenity_category':
      variable_set('amenity_categories_timestamp', time());
      break;
    case 'location':
      variable_set('locations_timestamp', time());
      break;
      default:
      # code...
      break;
  }
}

function field_dos_feed_status_menu_object() {
    $feeds = array(
      array('amenities' => variable_get('amenities_timestamp', '')),
      array('amenity-categories' => variable_get('amenity_categories_timestamp', '')),
      array('behind-the-scenes-items' => variable_get('behind_scenes_items_timestamp', '')),
      array('collection-highlights' => variable_get('collection_highlights_timestamp', '')),
      array('exhibit-items' => variable_get('exhibit_items_timestamp', '')),
      array('itineraries' => variable_get('itineraries_timestamp', '')),
      array('locations' => variable_get('locations_timestamp', '')),
      array('schedule' => variable_get('schedule_items_timestamp', '')),
      array('touchscreen-stations' => variable_get('touchscreen_stations_timestamp', '')),
    );
    return $feeds;
}