Backend.php

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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 {{{ 
 
// }}}
 
// dependencies {{{
require_once 'XML/RPC2/Exception.php';
// }}}
 
abstract class XML_RPC2_Backend 
{
 
    // {{{ properties
    
    protected static $currentBackend;
    
    // }}}
    // {{{ setBackend()
    
    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 (
            $backend == 'Xmlrpcext' &&
            !function_exists('xmlrpc_server_create') &&
            !( // TODO Use PEAR::loadExtension once PEAR passes PHP5 unit tests (E_STRICT compliance, namely)
              @dl('php_xmlrpc' . PHP_SHLIB_SUFFIX)    || @dl('xmlrpc' . PHP_SHLIB_SUFFIX)
             )
           ) {
            throw new XML_RPC2_Exception('Unable to load xmlrpc extension.');
        }     
        self::$currentBackend = $backend;
    }
    
    // }}}
    // {{{ getBackend()
    
    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()
    
    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()
    
    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()
        
    public static function getValueClassname() {
        require_once(sprintf('XML/RPC2/Backend/%s/Value.php', self::getBackend()));
        return sprintf('XML_RPC2_Backend_%s_Value', self::getBackend());
    }
    
    // }}}
    
}