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<?php
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
namespace TodoList\Flash;
use \Exception;
/**
* Class managing flash messages.
* <p>
* (Flash messages are positive messages that are displayed exactly once,
* on the next page; typically after form submitting.)
*/
final class Flash {
const FLASHES_KEY = '_flashes';
private static $flashes = null;
private function __construct() {
}
public static function hasFlashes() {
self::initFlashes();
return count(self::$flashes) > 0;
}
public static function addFlash($message) {
if (!strlen(trim($message))) {
throw new Exception('Cannot insert empty flash message.');
}
self::initFlashes();
self::$flashes[] = $message;
}
/**
* Get flash messages and clear them.
* @return array flash messages
*/
public static function getFlashes() {
self::initFlashes();
$copy = self::$flashes;
self::$flashes = [];
return $copy;
}
private static function initFlashes() {
if (self::$flashes !== null) {
return;
}
if (!array_key_exists(self::FLASHES_KEY, $_SESSION)) {
$_SESSION[self::FLASHES_KEY] = [];
}
self::$flashes = &$_SESSION[self::FLASHES_KEY];
}
}
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