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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4 foldmethod=marker: */
// LICENSE AGREEMENT. If folded, press za here to unfold and read license {{{
/**
* +-----------------------------------------------------------------------------+
* | Copyright (c) 2004-2006 Sergio Goncalves Carvalho |
* +-----------------------------------------------------------------------------+
* | This file is part of XML_RPC2. |
* | |
* | XML_RPC2 is free software; you can redistribute it and/or modify |
* | it under the terms of the GNU Lesser General Public License as published by |
* | the Free Software Foundation; either version 2.1 of the License, or |
* | (at your option) any later version. |
* | |
* | XML_RPC2 is distributed in the hope that it will be useful, |
* | but WITHOUT ANY WARRANTY; without even the implied warranty of |
* | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
* | GNU Lesser General Public License for more details. |
* | |
* | You should have received a copy of the GNU Lesser General Public License |
* | along with XML_RPC2; if not, write to the Free Software |
* | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
* | 02111-1307 USA |
* +-----------------------------------------------------------------------------+
* | Author: Sergio Carvalho <sergio.carvalho@portugalmail.com> |
* +-----------------------------------------------------------------------------+
*
* @category XML
* @package XML_RPC2
* @author Sergio Carvalho <sergio.carvalho@portugalmail.com>
* @copyright 2004-2006 Sergio Carvalho
* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
* @version CVS: $Id: Backend.php 308634 2011-02-24 19:13:56Z sergiosgc $
* @link http://pear.php.net/package/XML_RPC2
*/
// }}}
// dependencies {{{
require_once 'XML/RPC2/Exception.php';
require_once 'PEAR.php';
// }}}
/**
* XML_RPC Backend class. The backend is responsible for the actual execution of
* a request, as well as payload encoding and decoding.
*
* The only external usage of this class is when explicitely setting the backend, as in
* <code>
* XML_RPC2_Backend::setBackend('php');
* // or
* XML_RPC2_Backend::setBackend('xmlrpcext');
* </code>
* Note that if you do not explicitely set the backend, it will be selected automatically.
*
* Internally, this class provides methods to obtain the relevant backend classes:
* - The server class
* - The client class
* - The value class
*
* @category XML
* @package XML_RPC2
* @author Sergio Carvalho <sergio.carvalho@portugalmail.com>
* @copyright 2004-2006 Sergio Carvalho
* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
* @link http://pear.php.net/package/XML_RPC2
*/
abstract class XML_RPC2_Backend
{
// {{{ properties
/**
* current backend
*
* @var string
*/
protected static $currentBackend;
// }}}
// {{{ setBackend()
/**
* Backend setter.
*
* Currently, two backends exist: 'php' and 'XMLRPCext'.
* The PHP backend has no external dependencies, while the xmlrpcext
* requires the xmlrpc extension.
*
* The XMLRPCext backend is quite faster, and will be automatically
* selected when no explicit backend has been set and the extension
* is available.
*
* @param string The backend to select. Either 'php' or 'XMLRPCext'.
*/
public static function setBackend($backend)
{
$backend = ucfirst(strtolower($backend));
if (
$backend != 'Php' &&
$backend != 'Xmlrpcext'
) {
throw new XML_RPC2_Exception(sprintf('Backend %s does not exist', $backend));
}
if (
$backend == 'Xmlrpcext' &&
!function_exists('xmlrpc_server_create') &&
!( PEAR::loadExtension('php_xmlrpc') )
) {
throw new XML_RPC2_Exception('Unable to load xmlrpc extension.');
}
self::$currentBackend = $backend;
}
// }}}
// {{{ getBackend()
/**
* Backend getter.
*
* Return the current backend name. If no backend was previously selected
* select one and set it.
*
* The xmlrpcext backend is preferred, and will be automatically
* selected when no explicit backend has been set and the xmlrpc
* extension exists. If it does not exist, then the php backend is
* selected.
*
* @return string The current backend
*/
protected static function getBackend()
{
if (!isset(self::$currentBackend)) {
try {
self::setBackend('XMLRPCext'); // We prefer this one
} catch (XML_RPC2_Exception $e) {
// TODO According to PEAR CG logging should occur here
self::setBackend('php'); // But will settle with this one in case of error
}
}
return self::$currentBackend;
}
// }}}
// {{{ getServerClassname()
/**
* Include the relevant php files for the server class, and return the backend server
* class name.
*
* @return string The Server class name
*/
public static function getServerClassname() {
require_once(sprintf('XML/RPC2/Backend/%s/Server.php', self::getBackend()));
return sprintf('XML_RPC2_Backend_%s_Server', self::getBackend());
}
// }}}
// {{{ getClientClassname()
/**
* Include the relevant php files for the client class, and return the backend client
* class name.
*
* @return string The Client class name
*/
public static function getClientClassname() {
require_once(sprintf('XML/RPC2/Backend/%s/Client.php', self::getBackend()));
return sprintf('XML_RPC2_Backend_%s_Client', self::getBackend());
}
// }}}
// {{{ getValueClassname()
/**
* Include the relevant php files for the value class, and return the backend value
* class name.
*
* @return string The Value class name
*/
public static function getValueClassname() {
require_once(sprintf('XML/RPC2/Backend/%s/Value.php', self::getBackend()));
return sprintf('XML_RPC2_Backend_%s_Value', self::getBackend());
}
// }}}
}
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