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path: root/src/SemanticScuttle/Service/Factory.php
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<?php
/* Connect to the database and build services */

class SemanticScuttle_Service_Factory
{
    /**
     * Array of service instances.
     * Key is service name (i.e. "Bookmark")
     *
     * @var array
     */
    protected static $instances = array();

    /**
     * Database connection
     *
     * @var sql_qb
     */
    protected static $db = null;

    /**
     * Array of service names -> new service class
     * in case you want to overwrite the services.
     *
     * Key is the old service name (i.e. "Bookmark"),
     * value the new class name, e.g.
     * "My_Cool_Own_BookmarkService"
     *
     * @var array
     */
    protected static $serviceoverrides = array();



    /**
     * Returns the service for the given name.
     *
     * @param string $name Service name (i.e. "Bookmark")
     *
     * @return SemanticScuttle_Service Service object
     */
    public static function getServiceInstance($name)
    {
        self::loadDb();
        self::loadService($name);
        return self::$instances[$name];
    }



    /**
     * Loads service with the given name into
     * self::$instances[$name].
     *
     * @param string $name Service name (i.e. 'Bookmark')
     *
     * @return void
     */
    protected static function loadService($name)
    {
        if (isset(self::$instances[$name])) {
            return;
        }

        if (isset(self::$serviceoverrides[$name])) {
            $class = self::$serviceoverrides[$name];
        } else {
            $class = 'SemanticScuttle_Service_' . $name;
        }

        if (!class_exists($class)) {
            //PEAR classname to filename rule
            $file = str_replace('_', '/', $class) . '.php';
            require_once $file;
        }

        self::$instances[$name] = call_user_func(
            array($class, 'getInstance'),
            self::$db
        );
    }



    /**
     * Loads self::$db if it is not loaded already.
     *
     * @return void
     */
    protected static function loadDb()
    {
        global $dbhost, $dbuser, $dbpass, $dbname, 
            $dbport, $dbpersist, $dbtype;

        if (self::$db !== null) {
            return;
        }
        require_once 'SemanticScuttle/db/'. $dbtype .'.php';
        $db = new sql_db();
        $db->sql_connect(
            $dbhost, $dbuser, $dbpass, $dbname, $dbport, $dbpersist
        );
        if(!$db->db_connect_id) {
            message_die(
                CRITICAL_ERROR,
                'Could not connect to the database',
                $db
            );
        }
        $db->sql_query('SET NAMES UTF8');
    }

}
?>