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<?php
/**
* SemanticScuttle - your social bookmark manager.
*
* PHP version 5.
*
* @category Bookmarking
* @package SemanticScuttle
* @author Benjamin Huynh-Kim-Bang <mensonge@users.sourceforge.net>
* @author Christian Weiske <cweiske@cweiske.de>
* @author Eric Dane <ericdane@users.sourceforge.net>
* @license GPL http://www.gnu.org/licenses/gpl.html
* @link http://sourceforge.net/projects/semanticscuttle
*/
/**
* Connect to the database and build services.
*
* @category Bookmarking
* @package SemanticScuttle
* @author Benjamin Huynh-Kim-Bang <mensonge@users.sourceforge.net>
* @author Christian Weiske <cweiske@cweiske.de>
* @author Eric Dane <ericdane@users.sourceforge.net>
* @license GPL http://www.gnu.org/licenses/gpl.html
* @link http://sourceforge.net/projects/semanticscuttle
*/
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
*/
public static $serviceoverrides = array();
/**
* Returns the service for the given name.
*
* @param string $name Service name (i.e. "Bookmark")
*
* @return SemanticScuttle_Service Service object
*/
public static function get($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';
include_once $file;
}
self::$instances[$name] = call_user_func(
array($class, 'getInstance'),
self::$db
);
}
/**
* Loads self::$db if it is not loaded already.
* Dies if the connection could not be established.
*
* @return void
*/
protected static function loadDb()
{
global $dbhost, $dbuser, $dbpass, $dbname,
$dbport, $dbpersist, $dbtype, $dbneedssetnames;
if (self::$db !== null) {
return;
}
include_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',
self::$db
);
}
$dbneedssetnames && $db->sql_query('SET NAMES UTF8');
self::$db = $db;
}
/**
* Returns sql database object
*
* @return sql_db Database instance
*/
public static function getDb()
{
self::loadDb();
return self::$db;
}
}
?>
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