class views_plugin extends views_object {
  /**
   * The top object of a view.
   *
   * @var view
   */
  var $view = NULL;

  /**
   * The current used views display.
   *
   * @var views_display
   */
  var $display = NULL;

  /**
   * The plugin type of this plugin, for example style or query.
   */
  var $plugin_type = NULL;

  /**
   * The plugin name of this plugin, for example table or full.
   */
  var $plugin_name = NULL;

  /**
   * Init will be called after construct, when the plugin is attached to a
   * view and a display.
   */

  /**
   * Provide a form to edit options for this plugin.
   */
  function options_form(&$form, &$form_state) {
    // Some form elements belong in a fieldset for presentation, but can't
    // be moved into one because of the form_state['values'] hierarchy. Those
    // elements can add a #fieldset => 'fieldset_name' property, and they'll
    // be moved to their fieldset during pre_render.
    $form['#pre_render'][] = 'views_ui_pre_render_add_fieldset_markup';
  }

  /**
   * Validate the options form.
   */
  function options_validate(&$form, &$form_state) {
  }

  /**
   * Handle any special handling on the validate form.
   */
  function options_submit(&$form, &$form_state) {
  }

  /**
   * Add anything to the query that we might need to.
   */
  function query() {
  }

  /**
   * Provide a full list of possible theme templates used by this style.
   */
  function theme_functions() {
    return views_theme_functions($this->definition['theme'], $this->view, $this->display);
  }

  /**
   * Provide a list of additional theme functions for the theme information page
   */
  function additional_theme_functions() {
    $funcs = array();
    if (!empty($this->definition['additional themes'])) {
      foreach ($this->definition['additional themes'] as $theme => $type) {
        $funcs[] = views_theme_functions($theme, $this->view, $this->display);
      }
    }
    return $funcs;
  }

  /**
   * Validate that the plugin is correct and can be saved.
   *
   * @return
   *   An array of error strings to tell the user what is wrong with this
   *   plugin.
   */
  function validate() {
    return array();
  }

  /**
   * Returns the summary of the settings in the display.
   */
  function summary_title() {
    return t('Settings');
  }
  /**
   * Return the human readable name of the display.
   *
   * This appears on the ui beside each plugin and beside the settings link.
   */
  function plugin_title() {
    if (isset($this->definition['short title'])) {
      return check_plain($this->definition['short title']);
    }
    return check_plain($this->definition['title']);
  }
}