<?php
/**
 * @defgroup views_sort_handlers Views' sort handlers
 * @{
 * Handlers to tell Views how to sort queries
 */

/**
 * Base sort handler that has no options and performs a simple sort
 */
class views_handler_sort extends views_handler {
  /**
   * Called to add the sort to a query.
   */
  function query() {
    $this->ensure_my_table();
    // Add the field.
    $this->query->add_orderby($this->table_alias, $this->real_field, $this->options['order']);
  }

  function option_definition() {
    $options = parent::option_definition();

    $options['order'] = array('default' => 'ASC');

    return $options;
  }

  /**
   * Display whether or not the sort order is ascending or descending
   */
  function admin_summary() {
    switch ($this->options['order']) {
      case 'ASC':
      case 'asc':
      default:
        $type = t('asc');
        break;
      case 'DESC';
      case 'desc';
        $type = t('desc');
        break;
    }
    return '<span class="views-ascending"><span>' . $type . '</span></span>';
  }

  /**
   * Basic options for all sort criteria
   */
  function options_form(&$form, &$form_state) {
    $form['order'] = array(
      '#type' => 'radios',
      '#title' => t('Sort order'),
      '#options' => array('ASC' => t('Ascending'), 'DESC' => t('Descending')),
      '#default_value' => $this->options['order'],
    );
  }
}

/**
 * A special handler to take the place of missing or broken handlers.
 */
class views_handler_sort_broken extends views_handler_sort {
  function ui_name($short = FALSE) {
    return t('Broken/missing handler');
  }

  function ensure_my_table() { /* No table to ensure! */ }
  function query() { /* No query to run */ }
  function options_form(&$form, &$form_state) {
    $form['markup'] = array(
      '#prefix' => '<div class="form-item description">',
      '#value' => t('The handler for this item is broken or missing and cannot be used. If a module provided the handler and was disabled, re-enabling the module may restore it. Otherwise, you should probably delete this item.'),
    );
  }

  /**
   * Determine if the handler is considered 'broken'
   */
  function broken() { return TRUE; }
}


/**
 * @}
 */