OpenSQLManager/sys/common/settings.php

<?php
/**
 * OpenSQLManager
 *
 * Free Database manager for Open Source Databases
 *
 * @author 		Timothy J. Warren
 * @copyright	Copyright (c) 2012
 * @link 		https://github.com/aviat4ion/OpenSQLManager
 * @license 	http://philsturgeon.co.uk/code/dbad-license 
 */

// --------------------------------------------------------------------------

/**
 * Class for manipulating datbase connections, and program settings
 * 
 * Use JSON for compatibility
 */
class Settings {

	private $current;
	private static $instance;

	public static function &get_instance()
	{
		if( ! isset(self::$instance))
		{
			$name = __CLASS__;
			self::$instance = new $name();
		}

		return self::$instance;
	}
	
	/**
	 * Load the settings file - private so it can't be loaded
	 * directly - the settings should be safe!
	 */
	private function __construct()
	{
		$path = SETTINGS_DIR.'/settings.json'; 

		if( ! is_file($path))
		{
			//Create the file!
			touch($path);
			$this->current = new stdClass();
		}
		else
		{
			$this->current = json_decode(file_get_contents($path));
		}

		// Add the DB object under the settings if it doesn't already exist
		if( ! isset($this->current->dbs))
		{
			$this->current->dbs = new stdClass();
		}

	}

	// --------------------------------------------------------------------------

	/**
	 * Output the settings on destruct
	 */
	public function __destruct()
	{
		file_put_contents(SETTINGS_DIR . '/settings.json', json_encode($this->current));
	}

	// --------------------------------------------------------------------------

	/**
	 * Magic method to simplify isset checking for config options
	 * 
	 * @param string $key
	 * @return $mixed
	 */
	public function __get($key)
	{
		return (isset($this->current->{$key}) && $key != "dbs") 
			? $this->current->{$key} 
			: NULL;
	}

	// --------------------------------------------------------------------------

	/**
	 * Magic method to simplify setting config options
	 * 
	 * @param string $key
	 * @param mixed $val
	 */
	public function __set($key, $val)
	{
		//Don't allow direct db config changes
		if($key == "dbs")
		{
			return FALSE;
		}

		$this->current->{$key} = $val;
	}

	// --------------------------------------------------------------------------

	/**
	 * Add a database connection
	 *
	 * @param string $name
	 * @param array $params
	 */
	public function add_db($name, $params)
	{
		if( ! isset($this->current->dbs->{$name}))
		{
			$this->current->dbs->{$name} = array();
			$this->current->dbs->{$name} = $params;
		}
		else
		{
			return FALSE;
		}
	}

	// --------------------------------------------------------------------------

	/**
	 * Edit a database connection
	 *
	 * @param string $name
	 * @param array $params
	 */
	public function edit_db($name, $params)
	{
		if(isset($this->current->dbs->{$name}))
		{
			$this->current->dbs->{$name} = $params;
		}
		else
		{
			return FALSE;
		}
	}

	// --------------------------------------------------------------------------

	/**
	 * Remove a database connection
	 * 
	 * @param  string $name
	 */
	public function remove_db($name)
	{
		if( ! isset($this->current->dbs->{$name}))
		{
			return FALSE;
		}

		// Remove the db name from the object
		unset($this->current->dbs->{$name});
	}

	// --------------------------------------------------------------------------
	
	/**
	 * Retreive all db connections
	 * 
	 * @return  array 
	 */
	public function get_dbs()
	{
		return $this->current->dbs;
	}

	// --------------------------------------------------------------------------

	/**
	 * Retreive a specific database connection
	 *
	 * @param string $name
	 * @return object
	 */
	public function get_db($name)
	{
		return (isset($this->current->dbs->{$name})) ? $this->current->dbs->{$name} : FALSE;
	}

}
// End of settings.php