Initial import.

vendor/guzzle/http/Guzzle/Http/Message/Header/CacheControl.php

@@ -0,0 +1,121 @@
+<?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}";
+        }
+    }
+}