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<?php
/**
 * Akeeba Engine
 * The modular PHP5 site backup engine
 * @copyright Copyright (c)2009-2012 Nicholas K. Dionysopoulos
 * @license GNU GPL version 3 or, at your option, any later version
 * @package akeebaengine
 * @version $Id$
 */

// Protection against direct access
defined('AKEEBAENGINE') or die('Restricted access');

/**
 * A utility class to return a database connection object
 */
class AECoreDatabase extends AEAbstractObject
{
	/**
	 * Returns a database connection object. It caches the created objects for future use.
	 * @param array $options Options to use when instanciating the database connection
	 * @return AEAbstractDriver
	 */
	public static function &getDatabase($options, $unset = false)
	{
		static $instances;

		if (!isset( $instances )) {
			$instances = array();
		}

		$signature = serialize( $options );

		if($unset)
		{
			if (!empty($instances[$signature]))
			{
				$db =& $instances[$signature];
				$db = null;
				unset($instances[$signature]);
			}
			$null = null;
			return $null;
		}

		if (empty($instances[$signature]))
		{
			$driver		= array_key_exists('driver', $options) 		? $options['driver']	: '';
			$select		= array_key_exists('select', $options)		? $options['select']	: true;
			$database	= array_key_exists('database', $options)	? $options['database']	: null;

			$driver = preg_replace('/[^A-Z0-9_\.-]/i', '', $driver);
			if(empty($driver))
			{
				// No driver specified; try to guess
				$default_signature = serialize( AEPlatform::getInstance()->get_platform_database_options() );
				if($signature == $default_signature)
				{
					$driver = AEPlatform::getInstance()->get_default_database_driver(true);
				}
				else
				{
					$driver = AEPlatform::getInstance()->get_default_database_driver(false);
				}
			}
			else
			{
				// Make sure a full driver name was given
				if(substr($driver,0,2) != 'AE') $driver = 'AEDriver'.ucfirst($driver);
			}

			$instance	= new $driver($options);

			$instances[$signature] = & $instance;
		}

		return $instances[$signature];
	}

	public static function unsetDatabase($options)
	{
		self::getDatabase($options, true);
	}
}