ConnectionStringSource.php
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<?php
/**
* LICENSE: Licensed 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.
*
* PHP version 5
*
* @category Microsoft
* @package WindowsAzure\Common\Internal
* @author Azure PHP SDK <azurephpsdk@microsoft.com>
* @copyright 2012 Microsoft Corporation
* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
* @link https://github.com/windowsazure/azure-sdk-for-php
*/
namespace WindowsAzure\Common\Internal;
/**
* Holder for default connection string sources used in CloudConfigurationManager.
*
* @category Microsoft
* @package WindowsAzure\Common\Internal
* @author Azure PHP SDK <azurephpsdk@microsoft.com>
* @copyright 2012 Microsoft Corporation
* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
* @version Release: 0.4.1_2015-03
* @link https://github.com/windowsazure/azure-sdk-for-php
*/
class ConnectionStringSource
{
/**
* The list of all sources which comes as default.
*
* @var type
*/
private static $_defaultSources;
/**
* @var boolean
*/
private static $_isInitialized;
/**
* Environment variable source name.
*/
const ENVIRONMENT_SOURCE = 'environment_source';
/**
* Initializes the default sources.
*
* @return none
*/
private static function _init()
{
if (!self::$_isInitialized) {
self::$_defaultSources = array(
self::ENVIRONMENT_SOURCE => array(__CLASS__, 'environmentSource')
);
self::$_isInitialized = true;
}
}
/**
* Gets a connection string value from the system environment.
*
* @param string $key The connection string name.
*
* @return string
*/
public static function environmentSource($key)
{
Validate::isString($key, 'key');
return getenv($key);
}
/**
* Gets list of default sources.
*
* @return array
*/
public static function getDefaultSources()
{
self::_init();
return self::$_defaultSources;
}
}