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<?php
namespace Guzzle\Http\Message\Header;
use Guzzle\Http\Message\Header;
/**
* Provides helpful functionality for Cache-Control headers
*/
class CacheControl extends Header
{
/** @var array */
protected $directives;
public function add($value)
{
parent::add($value);
$this->directives = null;
}
public function removeValue($searchValue)
{
parent::removeValue($searchValue);
$this->directives = null;
}
/**
* Check if a specific cache control directive exists
*
* @param string $param Directive to retrieve
*
* @return bool
*/
public function hasDirective($param)
{
$directives = $this->getDirectives();
return isset($directives[$param]);
}
/**
* Get a specific cache control directive
*
* @param string $param Directive to retrieve
*
* @return string|bool|null
*/
public function getDirective($param)
{
$directives = $this->getDirectives();
return isset($directives[$param]) ? $directives[$param] : null;
}
/**
* Add a cache control directive
*
* @param string $param Directive to add
* @param string $value Value to set
*
* @return self
*/
public function addDirective($param, $value)
{
$directives = $this->getDirectives();
$directives[$param] = $value;
$this->updateFromDirectives($directives);
return $this;
}
/**
* Remove a cache control directive by name
*
* @param string $param Directive to remove
*
* @return self
*/
public function removeDirective($param)
{
$directives = $this->getDirectives();
unset($directives[$param]);
$this->updateFromDirectives($directives);
return $this;
}
/**
* Get an associative array of cache control directives
*
* @return array
*/
public function getDirectives()
{
if ($this->directives === null) {
$this->directives = array();
foreach ($this->parseParams() as $collection) {
foreach ($collection as $key => $value) {
$this->directives[$key] = $value === '' ? true : $value;
}
}
}
return $this->directives;
}
/**
* Updates the header value based on the parsed directives
*
* @param array $directives Array of cache control directives
*/
protected function updateFromDirectives(array $directives)
{
$this->directives = $directives;
$this->values = array();
foreach ($directives as $key => $value) {
$this->values[] = $value === true ? $key : "{$key}={$value}";
}
}
}
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