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<?php
/**
* @package ZOO
* @author YOOtheme http://www.yootheme.com
* @copyright Copyright (C) YOOtheme GmbH
* @license http://www.gnu.org/licenses/gpl.html GNU/GPL
*/
/**
* The cache helper class.
*
* @package Component.Helpers
* @since 2.0
*/
class CacheHelper extends AppHelper {
/**
* Creates an AppCache instance
*
* @param string $file Path to cache file
* @param boolean $hash Wether the key should be hashed
* @param int $lifetime The values lifetime
*
* @return AppCache
*
* @since 2.0
*/
public function create($file, $hash = true, $lifetime = null) {
$cache = $this->app->object->create('AppCache', array($file, $hash, $lifetime));
$this->app->zoo->putIndexFile(dirname($file));
return $cache;
}
}
/**
* The cache class.
*
* @package Component.Helpers
* @since 2.0
*/
class AppCache {
/**
* Path to cache file
*
* @var string
* @since 2.0
*/
protected $_file = 'config.txt';
/**
* Path to cache file
*
* @var array
* @since 2.0
*/
protected $_items = array();
/**
* marks cache dirty
*
* @var boolean
* @since 2.0
*/
protected $_dirty = false;
/**
* The cached items
*
* @var boolean
* @since 2.0
*/
protected $_hash = true;
/**
* Class constructor
*
* @param string $file Path to cache file
* @param boolean $hash Wether the key should be hashed
* @param int $lifetime The values lifetime
* @since 2.0
*/
public function __construct($file, $hash = true, $lifetime = null) {
// if cache file doesn't exist, create it
if (!JFile::exists($file)) {
JFolder::create(dirname($file));
$buffer = '';
JFile::write($file, $buffer);
}
// set file and parse it
$this->_file = $file;
$this->_hash = $hash;
$this->_parse();
// clear out of date values
if ($lifetime) {
$lifetime = (int) $lifetime;
$remove = array();
foreach ($this->_items as $key => $value) {
if ((time() - $value['timestamp']) > $lifetime) {
$remove[] = $key;
}
}
foreach ($remove as $key) {
unset($this->_items[$key]);
}
}
}
/**
* Check if the cache file is writable and readable
*
* @return boolean If the cache can be used
*
* @since 2.0
*/
public function check() {
return is_readable($this->_file) && is_writable($this->_file);
}
/**
* Get a cache content
*
* @param string $key The key
*
* @return mixed The cache content
*
* @since 2.0
*/
public function get($key) {
if ($this->_hash)
$key = md5($key);
if (!array_key_exists($key, $this->_items))
return null;
return $this->_items[$key]['value'];
}
/**
* Set a cache content
*
* @param string $key The key
* @param mixed $value The value
*
* @return AppCache $this for chaining support
*
* @since 2.0
*/
public function set($key, $value) {
if ($this->_hash)
$key = md5($key);
if (array_key_exists($key, $this->_items) && @$this->_items[$key]['value'] == $value)
return $this;
$this->_items[$key]['value'] = $value;
$this->_items[$key]['timestamp'] = time();
$this->_dirty = true;
return $this;
}
/**
* Parse the cache file
*
* @return AppCache $this for chaining support
*
* @since 2.0
*/
protected function _parse() {
$content = JFile::read($this->_file);
if (!empty($content)) {
$items = json_decode($content, true);
if (is_array($items)) {
$this->_items = $items;
}
}
return $this;
}
/**
* Save the cache file if it was changed
*
* @return AppCache $this for chaining support
*
* @since 2.0
*/
public function save() {
if ($this->_dirty) {
JFile::write($this->_file, json_encode($this->_items));
}
return $this;
}
/**
* Clear the cache file
*
* @return AppCache $this for chaining support
*/
public function clear() {
$this->_items = array();
$this->_dirty = true;
return $this;
}
}
/**
* AppCacheException identifies an Exception in the AppCache class
* @see AppCache
*/
class AppCacheException extends AppException {}