<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Service_Console

 * @subpackage Exception

 * @version    $Id$

 * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @copyright  Copyright (c) 2009 - 2011, RealDolmen (http://www.realdolmen.com)

 * @license    http://phpazure.codeplex.com/license

 */

/**

* @see Zend_Service_Console_Command_ParameterSource_ParameterSourceInterface

*/

require_once 'Zend/Service/Console/Command/ParameterSource/ParameterSourceInterface.php';

/**

 * @category   Zend

 * @package    Zend_Service_Console

 * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @copyright  Copyright (c) 2009 - 2011, RealDolmen (http://www.realdolmen.com)

 * @license    http://phpazure.codeplex.com/license

 */

class Zend_Service_Console_Command_ParameterSource_Env

	implements Zend_Service_Console_Command_ParameterSource_ParameterSourceInterface

{

	/**

	 * Get value for a named parameter.

	 *

	 * @param mixed $parameter Parameter to get a value for

	 * @param array $argv Argument values passed to the script when run in console.

	 * @return mixed

	 */

	public function getValueForParameter($parameter, $argv = array())

	{

		// Default value

		$parameterValue = null;

		// Fetch value for parameter

		foreach ($parameter->aliases as $alias) {

			while (strpos($alias, '-') !== false) {

				$alias = substr($alias, 1);

			}

			$value = getenv($alias);

			if (!is_null($value) && $value !== false) {

				$parameterValue = $value;

				break;

			}

		}

		if (strtolower($parameterValue) == 'true') {

			$parameterValue = true;

		} else if (strtolower($parameterValue) == 'false') {

			$parameterValue = false;

		}

		// Done!

		return $parameterValue;

	}

}