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<?php defined('SYSPATH') or die('No direct script access.');

/**
 * Database reader for the kohana config system
 *
 * @package    Kohana/Database
 * @category   Configuration
 * @author     Kohana Team
 * @copyright  (c) 2011 Kohana Team
 * @license    http://kohanaframework.org/license
 */
class Kohana_Config_Database_Reader implements Kohana_Config_Reader
{
	protected $_db_instance = 'default';

protected $_table_name  = 'config';

/**
	 * Constructs the database reader object
	 *
	 * @param array Configuration for the reader
	 */
	public function __construct(array $config = NULL)
	{
		if (isset($config['instance']))
		{
			$this->_db_instance = $config['instance'];
		}

if (isset($config['table_name']))
		{
			$this->_table_name = $config['table_name'];
		}
	}

/**
	 * Tries to load the specificed configuration group
	 *
	 * Returns FALSE if group does not exist or an array if it does
	 *
	 * @param  string $group Configuration group
	 * @return boolean|array
	 */
	public function load($group)
	{
		$query = DB::select('config_key', 'config_value')
			->from($this->_table_name)
			->where('group_name', '=', $group)
			->execute($this->_db_instance);

return count($query) ? array_map('unserialize', $query->as_array('config_key', 'config_value')) : FALSE;
	}
}