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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\Http\Header;
/**
* Connection Header
*
* @link http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.10
*/
class Connection implements HeaderInterface
{
const CONNECTION_CLOSE = 'close';
const CONNECTION_KEEP_ALIVE = 'keep-alive';
/**
* Value of this header
*
* @var string
*/
protected $value = self::CONNECTION_KEEP_ALIVE;
/**
* @param $headerLine
* @return Connection
* @throws Exception\InvalidArgumentException
*/
public static function fromString($headerLine)
{
$header = new static();
list($name, $value) = GenericHeader::splitHeaderLine($headerLine);
// check to ensure proper header type for this factory
if (strtolower($name) !== 'connection') {
throw new Exception\InvalidArgumentException('Invalid header line for Connection string: "' . $name . '"');
}
$header->setValue(trim($value));
return $header;
}
/**
* Set Connection header to define persistent connection
*
* @param bool $flag
* @return Connection
*/
public function setPersistent($flag)
{
$this->value = (bool) $flag
? self::CONNECTION_KEEP_ALIVE
: self::CONNECTION_CLOSE;
return $this;
}
/**
* Get whether this connection is persistent
*
* @return bool
*/
public function isPersistent()
{
return ($this->value === self::CONNECTION_KEEP_ALIVE);
}
/**
* Set arbitrary header value
* RFC allows any token as value, 'close' and 'keep-alive' are commonly used
*
* @param string $value
* @return Connection
*/
public function setValue($value)
{
HeaderValue::assertValid($value);
$this->value = strtolower($value);
return $this;
}
/**
* Connection header name
*
* @return string
*/
public function getFieldName()
{
return 'Connection';
}
/**
* Connection header value
*
* @return string
*/
public function getFieldValue()
{
return $this->value;
}
/**
* Return header line
*
* @return string
*/
public function toString()
{
return 'Connection: ' . $this->getFieldValue();
}
}