wp-optimize / vendor / kriswallsmith / assetic / src / Assetic / Cache / ConfigCache.php

ConfigCache.php in WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance 3.2.5, at vendor/kriswallsmith/assetic/src/Assetic/Cache/ConfigCache.php

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1	<?php
2
3	/*
4	* This file is part of the Assetic package, an OpenSky project.
5	*
6	* (c) 2010-2014 OpenSky Project Inc
7	*
8	* For the full copyright and license information, please view the LICENSE
9	* file that was distributed with this source code.
10	*/
11
12	namespace Assetic\Cache;
13
14	/**
15	* A config cache stores values using var_export() and include.
16	*
17	* @author Kris Wallsmith <[email protected]>
18	*/
19	class ConfigCache
20	{
21	private $dir;
22
23	/**
24	* Construct.
25	*
26	* @param string $dir The cache directory
27	*/
28	public function __construct($dir)
29	{
30	$this->dir = $dir;
31	}
32
33	/**
34	* Checks of the cache has a file.
35	*
36	* @param string $resource A cache key
37	*
38	* @return Boolean True if a file exists
39	*/
40	public function has($resource)
41	{
42	return file_exists($this->getSourcePath($resource));
43	}
44
45	/**
46	* Writes a value to a file.
47	*
48	* @param string $resource A cache key
49	* @param mixed $value A value to cache
50	*/
51	public function set($resource, $value)
52	{
53	$path = $this->getSourcePath($resource);
54
55	if (!is_dir($dir = dirname($path)) && false === @mkdir($dir, 0777, true)) {
56	// @codeCoverageIgnoreStart
57	throw new \RuntimeException('Unable to create directory '.$dir);
58	// @codeCoverageIgnoreEnd
59	}
60
61	if (false === @file_put_contents($path, sprintf("<?php\n\n// $resource\nreturn %s;\n", var_export($value, true)))) {
62	// @codeCoverageIgnoreStart
63	throw new \RuntimeException('Unable to write file '.$path);
64	// @codeCoverageIgnoreEnd
65	}
66	}
67
68	/**
69	* Loads and returns the value for the supplied cache key.
70	*
71	* @param string $resource A cache key
72	*
73	* @return mixed The cached value
74	*/
75	public function get($resource)
76	{
77	$path = $this->getSourcePath($resource);
78
79	if (!file_exists($path)) {
80	throw new \RuntimeException('There is no cached value for '.$resource);
81	}
82
83	return include $path;
84	}
85
86	/**
87	* Returns a timestamp for when the cache was created.
88	*
89	* @param string $resource A cache key
90	*
91	* @return integer A UNIX timestamp
92	*/
93	public function getTimestamp($resource)
94	{
95	$path = $this->getSourcePath($resource);
96
97	if (!file_exists($path)) {
98	throw new \RuntimeException('There is no cached value for '.$resource);
99	}
100
101	if (false === $mtime = @filemtime($path)) {
102	// @codeCoverageIgnoreStart
103	throw new \RuntimeException('Unable to determine file mtime for '.$path);
104	// @codeCoverageIgnoreEnd
105	}
106
107	return $mtime;
108	}
109
110	/**
111	* Returns the path where the file corresponding to the supplied cache key can be included from.
112	*
113	* @param string $resource A cache key
114	*
115	* @return string A file path
116	*/
117	private function getSourcePath($resource)
118	{
119	$key = md5($resource);
120
121	return $this->dir.'/'.$key[0].'/'.$key.'.php';
122	}
123	}
124