[studs-devel] access to datasource from taglib

[Timur V. <ti...@e-...>]

Hello.

Let's assume, that it is required to create tag carrying out specific thing=
s in the project.
Tag should take data from from DB by interaction with a class Manager
which it is returned DataSource object reference.


Let's name ours tag HtmlAreaTag, which detching data by the key.

class HtmlAreaTag extends TagSupport
{
....

        function getBlock()
        {
                $manager        =3D& new HtmlAreaManager(TagUtils::getDataS=
ource($this->pageContext));
                $block          =3D& $manager->getRowByAlias($this->getAlia=
s());
               =20
                return is_null($block) ? '' : $block->getHtml();
        }

}

For this purpose in TagUtils I suggest to add function


    /**
     * Return the default data source for the current module.
     *
     * @param request The HttpServletRequest we are processing
         * @return DataSource
         * @throws ServletException If the datasource with the specified ke=
y could not be found
         */
        function &getDataSource(&$pageContext, $key =3D null)
        {
                if (is_null($key))
                {
                        $key =3D c('StudsConstants::DATA_SOURCE_KEY');
                }

                // identify the current module
                $request                =3D& $pageContext->getRequest();
                $servletContext =3D& $pageContext->getServletContext();
                $moduleConfig   =3D& ModuleUtils::getModuleConfig($request,=
 $servletContext);

                // return the requested data source instance
                $ds =3D& $servletContext->getAttribute($key . $moduleConfig=
->getPrefix());
                if ($ds =3D=3D null)
                {
                        throw_exception(new ServletException('The datasourc=
e with the requested key \'' . $key . '\' has not been configured'));
                        return;
                }

                return $ds;
        }



 =20

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 Timur Vafin