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<?php
/**
* Copyright 2010-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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 Aws\Common;
/**
* Represents an enumerable set of values
*/
abstract class Enum
{
/**
* @var array A cache of all enum values to increase performance
*/
protected static $cache = array();
/**
* Returns the names (or keys) of all of constants in the enum
*
* @return array
*/
public static function keys()
{
return array_keys(static::values());
}
/**
* Return the names and values of all the constants in the enum
*
* @return array
*/
public static function values()
{
$class = get_called_class();
if (!isset(self::$cache[$class])) {
$reflected = new \ReflectionClass($class);
self::$cache[$class] = $reflected->getConstants();
}
return self::$cache[$class];
}
}
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