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CloudConfigurationManager.php
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CloudConfigurationManager.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
*
* @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;
use WindowsAzure\Common\Internal\Utilities;
use WindowsAzure\Common\Internal\Validate;
use WindowsAzure\Common\Internal\ConnectionStringSource;
/**
* Configuration manager for accessing Windows Azure settings.
*
* @category Microsoft
*
* @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: 0.5.0_2016-11
*
* @link https://github.com/windowsazure/azure-sdk-for-php
*/
class CloudConfigurationManager
{
/**
* @var bool
*/
private static $_isInitialized = false;
/**
* The list of connection string sources.
*
* @var array
*/
private static $_sources;
/**
* Restrict users from creating instances from this class.
*/
private function __construct()
{
}
/**
* Initializes the connection string source providers.
*/
private static function _init()
{
if (!self::$_isInitialized) {
self::$_sources = [];
// Get list of default connection string sources.
$default = ConnectionStringSource::getDefaultSources();
foreach ($default as $name => $provider) {
self::$_sources[$name] = $provider;
}
self::$_isInitialized = true;
}
}
/**
* Gets a connection string from all available sources.
*
* @param string $key The connection string key name
*
* @return string If the key does not exist return null
*/
public static function getConnectionString($key)
{
Validate::isString($key, 'key');
self::_init();
$value = null;
foreach (self::$_sources as $source) {
$value = call_user_func_array($source, [$key]);
if (!empty($value)) {
break;
}
}
return $value;
}
/**
* Registers a new connection string source provider. If the source to get
* registered is a default source, only the name of the source is required.
*
* @param string $name The source name
* @param callable $provider The source callback
* @param bool $prepend When true, the $provider is processed first when
* calling getConnectionString. When false (the default) the $provider is
* processed after the existing callbacks
*/
public static function registerSource($name, $provider = null, $prepend = false)
{
Validate::isString($name, 'name');
Validate::notNullOrEmpty($name, 'name');
self::_init();
$default = ConnectionStringSource::getDefaultSources();
// Try to get callback if the user is trying to register a default source.
$provider = Utilities::tryGetValue($default, $name, $provider);
Validate::notNullOrEmpty($provider, 'callback');
if ($prepend) {
self::$_sources = array_merge(
[$name => $provider],
self::$_sources
);
} else {
self::$_sources[$name] = $provider;
}
}
/**
* Unregisters a connection string source.
*
* @param string $name The source name
*
* @return callable
*/
public static function unregisterSource($name)
{
Validate::isString($name, 'name');
Validate::notNullOrEmpty($name, 'name');
self::_init();
$sourceCallback = Utilities::tryGetValue(self::$_sources, $name);
if (!is_null($sourceCallback)) {
unset(self::$_sources[$name]);
}
return $sourceCallback;
}
}