CacheControl.php

<?php
 
namespace Guzzle\Http\Message\Header;
 
use Guzzle\Http\Message\Header;
 
class CacheControl extends Header
{
    protected $directives;
 
    public function add($value)
    {
        parent::add($value);
        $this->directives = null;
    }
 
    public function removeValue($searchValue)
    {
        parent::removeValue($searchValue);
        $this->directives = null;
    }
 
    public function hasDirective($param)
    {
        $directives = $this->getDirectives();
 
        return isset($directives[$param]);
    }
 
    public function getDirective($param)
    {
        $directives = $this->getDirectives();
 
        return isset($directives[$param]) ? $directives[$param] : null;
    }
 
    public function addDirective($param, $value)
    {
        $directives = $this->getDirectives();
        $directives[$param] = $value;
        $this->updateFromDirectives($directives);
 
        return $this;
    }
 
    public function removeDirective($param)
    {
        $directives = $this->getDirectives();
        unset($directives[$param]);
        $this->updateFromDirectives($directives);
 
        return $this;
    }
 
    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;
    }
 
    protected function updateFromDirectives(array $directives)
    {
        $this->directives = $directives;
        $this->values = array();
 
        foreach ($directives as $key => $value) {
            $this->values[] = $value === true ? $key : "{$key}={$value}";
        }
    }
}