<?php
/*
     Message.php, provides functions for error and confirmation logging and
                  display
     Copyright (C) 2003 Arend van Beelen, Auton Rijnsburg

     This program is free software; you can redistribute it and/or modify it
     under the terms of the GNU General Public License as published by the Free
     Software Foundation; either version 2 of the License, or (at your option)
     any later version.

     This program is distributed in the hope that it will be useful, but WITHOUT
     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
     more details.

     You should have received a copy of the GNU General Public License along
     with this program; if not, write to the Free Software Foundation, Inc.,
     59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

     For any questions, comments or whatever, you may mail me at: hide@address.com
*/

require_once('Output.php');

/**
 * @brief Class used for logging and displaying confirmations and errors.
 *
 * Use the static functions error() and confirm() to report errors and
 * confirmations. You can then add a MessagesWidget somewhere in your
 * GUI which will show them.
 *
 * @sa MessagesWidget
 */
class Messages
{
	private static function instance()
	{
		if(self::$instance == null)
		{
			self::$instance = new Messages();
		}

		return self::$instance;
	}

	private function __construct()
	{
		$this->errors = array();
		$this->confirmations = array();
	}

	/**
	 * Adds an error to the errors log.
	 */
	public static function error($error)
	{
		$messages = self::instance();

		$messages->errors[] = $error;
	}

	/**
	 * Adds a confirmation to the confirmation log.
	 */
	public static function confirm($confirm)
	{
		$messages = self::instance();

		$messages->confirmations[] = $confirm;
	}

	/**
	 * @internal
	 */
	public static function show()
	{
		$messages = self::instance();

		if(sizeof($messages->errors) == 0 && sizeof($messages->confirmations) == 0)
		{
			return;
		}

		Output::write('<messageswidget>');
		foreach($messages->errors as $message)
		{
			Output::write("  <line><label class=\"error\">$message</label></line>");
		}
		foreach($messages->confirmations as $message)
		{
			Output::write("  <line><label class=\"confirm\">$message</label></line>");
		}
		Output::write('</messageswidget>');
	}

	private static $instance = null;
	private $errors;
	private $confirmations;
}

?>