class views_plugin_style_rss

class views_plugin_style_rss extends views_plugin_style {
    
    /**
     *
     */
    public function attach_to($display_id, $path, $title) {
        $display = $this->view->display[$display_id]->handler;
        $url_options = array();
        $input = $this->view
            ->get_exposed_input();
        if ($input) {
            $url_options['query'] = $input;
        }
        $url_options['absolute'] = TRUE;
        $url = url($this->view
            ->get_url(NULL, $path), $url_options);
        if ($display->has_path()) {
            if (empty($this->preview)) {
                drupal_add_feed($url, $title);
            }
        }
        else {
            if (empty($this->view->feed_icon)) {
                $this->view->feed_icon = '';
            }
            $this->view->feed_icon .= theme('feed_icon', array(
                'url' => $url,
                'title' => $title,
            ));
            drupal_add_html_head_link(array(
                'rel' => 'alternate',
                'type' => 'application/rss+xml',
                'title' => $title,
                'href' => $url,
            ));
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function option_definition() {
        $options = parent::option_definition();
        $options['description'] = array(
            'default' => '',
            'translatable' => TRUE,
        );
        return $options;
    }
    
    /**
     * {@inheritdoc}
     */
    public function options_form(&$form, &$form_state) {
        parent::options_form($form, $form_state);
        $form['description'] = array(
            '#type' => 'textfield',
            '#title' => t('RSS description'),
            '#default_value' => $this->options['description'],
            '#description' => t('This will appear in the RSS feed itself.'),
            '#maxlength' => 1024,
        );
    }
    
    /**
     * Return an array of additional XHTML elements to add to the channel.
     *
     * @return
     *   An array that can be passed to format_xml_elements().
     */
    public function get_channel_elements() {
        return array();
    }
    
    /**
     * Return an atom:link XHTML element to add to the channel to comply with
     * the RSS 2.0 specification.
     *
     * @see http://validator.w3.org/feed/docs/warning/MissingAtomSelfLink.html
     *
     * @return
     *   An array that can be passed to format_xml_elements().
     */
    public function get_channel_elements_atom_link() {
        $url_options = array(
            'absolute' => TRUE,
        );
        $input = $this->view
            ->get_exposed_input();
        if ($input) {
            $url_options['query'] = $input;
        }
        $url = url($this->view
            ->get_url(), $url_options);
        return array(
            array(
                'namespace' => array(
                    'xmlns:atom' => 'http://www.w3.org/2005/Atom',
                ),
                'key' => 'atom:link',
                'attributes' => array(
                    'href' => $url,
                    'rel' => 'self',
                    'type' => 'application/rss+xml',
                ),
            ),
        );
    }
    
    /**
     * Get RSS feed description.
     *
     * @return string
     *   The string containing the description with the tokens replaced.
     */
    public function get_description() {
        $description = $this->options['description'];
        // Allow substitutions from the first row.
        $description = $this->tokenize_value($description, 0);
        return $description;
    }
    
    /**
     * {@inheritdoc}
     */
    public function render() {
        if (empty($this->row_plugin)) {
            vpr('views_plugin_style_default: Missing row plugin');
            return;
        }
        $rows = '';
        // This will be filled in by the row plugin and is used later on in the
        // theming output.
        $this->namespaces = array(
            'xmlns:dc' => 'http://purl.org/dc/elements/1.1/',
        );
        // Fetch any additional elements for the channel and merge in their
        // namespaces.
        $this->channel_elements = array_merge($this->get_channel_elements(), $this->get_channel_elements_atom_link());
        foreach ($this->channel_elements as $element) {
            if (isset($element['namespace'])) {
                $this->namespaces = array_merge($this->namespaces, $element['namespace']);
            }
        }
        foreach ($this->view->result as $row_index => $row) {
            $this->view->row_index = $row_index;
            $rows .= $this->row_plugin
                ->render($row);
        }
        $output = theme($this->theme_functions(), array(
            'view' => $this->view,
            'options' => $this->options,
            'rows' => $rows,
        ));
        unset($this->view->row_index);
        return $output;
    }

}