Magento - Grid column decorator for 'actions' depending on row

decorate_method.php

<?php

    /**
     * Decorate the actions column
     * @access public
     * @return string
     */
    public function decorateActionColumn($value, $row, $column, $isExport)
    {
        $links = array();
        foreach ($column->getActions() as $action) {
            if (isset($action['condition_method']) && !$row->{$action['condition_method']}()) {
                continue;
            }
            if (isset($action['condition']) && !$row->getData($action['condition'])) {
                continue;
            }
            $args = array();
            $args['href'] = 'href="' . $this->getUrl($action['url'], array($column->getIndex() => $row->{$column->getGetter()}())) . '"';
            $args['title'] = 'title="' . addslashes($action['caption']) . '"';

            if (isset($action['onclick'])) {
                $args['onclick'] = 'onclick="' . $action['onclick'] . '"';
            }

            if (isset($action['confirm'])) {
                $args['onclick'] = 'onclick="return window.confirm(\''
                               . addslashes($this->htmlEscape($action['confirm']))
                               . '\')"';
            }

            $links[] = '<a ' . implode(' ', $args) . '>' . $action['caption'] . '</a>';
        }

        return implode(' ', $links);
    }