views_handler_field_node_revision_link.inc

<?php


/**
 * @file
 * Definition of views_handler_field_node_revision_link.
 */

/**
 * Field handler to present a link to a node revision.
 *
 * @ingroup views_field_handlers
 */
class views_handler_field_node_revision_link extends views_handler_field_node_link {
    
    /**
     * {@inheritdoc}
     */
    public function construct() {
        parent::construct();
        $this->additional_fields['node_vid'] = array(
            'table' => 'node_revision',
            'field' => 'vid',
        );
    }
    
    /**
     * {@inheritdoc}
     */
    public function access() {
        return user_access('view revisions') || user_access('administer nodes');
    }
    
    /**
     * {@inheritdoc}
     */
    public function render_link($data, $values) {
        list($node, $vid) = $this->get_revision_entity($values, 'view');
        if (!isset($vid)) {
            return;
        }
        // Current revision uses the node view path.
        $path = 'node/' . $node->nid;
        if ($node->vid != $vid) {
            $path .= "/revisions/{$vid}/view";
        }
        $this->options['alter']['make_link'] = TRUE;
        $this->options['alter']['path'] = $path;
        $this->options['alter']['query'] = drupal_get_destination();
        return !empty($this->options['text']) ? $this->options['text'] : t('view');
    }
    
    /**
     * Returns the revision values of a node.
     *
     * @param object $values
     *   An object containing all retrieved values.
     * @param string $op
     *   The operation being performed.
     *
     * @return array
     *   A numerically indexed array containing the current node object and the
     *   revision ID for this row.
     */
    public function get_revision_entity($values, $op) {
        $vid = $this->get_value($values, 'node_vid');
        $node = $this->get_value($values);
        // Unpublished nodes ignore access control.
        $node->status = 1;
        // Ensure user has access to perform the operation on this node.
        if (!node_access($op, $node)) {
            return array(
                $node,
                NULL,
            );
        }
        return array(
            $node,
            $vid,
        );
    }

}