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<?php
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 2011 Oracle and/or its affiliates. All rights reserved.
*
* Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common
* Development and Distribution License("CDDL") (collectively, the
* "License"). You may not use this file except in compliance with the
* License. You can obtain a copy of the License at
* http://www.netbeans.org/cddl-gplv2.html
* or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
* specific language governing permissions and limitations under the
* License. When distributing the software, include this License Header
* Notice in each file and include the License file at
* nbbuild/licenses/CDDL-GPL-2-CP. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the
* License Header, with the fields enclosed by brackets [] replaced by
* your own identifying information:
* "Portions Copyrighted [year] [name of copyright owner]"
*
* If you wish your version of this file to be governed by only the CDDL
* or only the GPL Version 2, indicate your decision by adding
* "[Contributor] elects to include this software in this distribution
* under the [CDDL or GPL Version 2] license." If you do not indicate a
* single choice of license, a recipient has the option to distribute
* your version of this file under either the CDDL, the GPL Version 2 or
* to extend the choice of license to its licensees as provided above.
* However, if you add GPL Version 2 code and therefore, elected the GPL
* Version 2 license, then the option applies only if the new code is
* made subject to such option by the copyright holder.
*
* Contributor(s):
*
* Portions Copyrighted 2011 Sun Microsystems, Inc.
*/
/**
* 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 = array();
return $copy;
}
private static function initFlashes() {
if (self::$flashes !== null) {
return;
}
if (!array_key_exists(self::FLASHES_KEY, $_SESSION)) {
$_SESSION[self::FLASHES_KEY] = array();
}
self::$flashes = &$_SESSION[self::FLASHES_KEY];
}
}
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