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<?php
/**
* Simple cache system, mainly for the RSS/ATOM feeds
*/
class CachedPage
{
// Directory containing page caches
private $cacheDir;
// Full URL of the page to cache -typically the value returned by pageUrl()
private $url;
// Should this URL be cached (boolean)?
private $shouldBeCached;
// Name of the cache file for this URL
private $filename;
/**
* Creates a new CachedPage
*
* @param string $cacheDir page cache directory
* @param string $url page URL
* @param bool $shouldBeCached whether this page needs to be cached
*/
public function __construct($cacheDir, $url, $shouldBeCached)
{
// TODO: check write access to the cache directory
$this->cacheDir = $cacheDir;
$this->url = $url;
$this->filename = $this->cacheDir.'/'.sha1($url).'.cache';
$this->shouldBeCached = $shouldBeCached;
}
/**
* Returns the cached version of a page, if it exists and should be cached
*
* @return string a cached version of the page if it exists, null otherwise
*/
public function cachedVersion()
{
if (!$this->shouldBeCached) {
return null;
}
if (is_file($this->filename)) {
return file_get_contents($this->filename);
}
return null;
}
/**
* Puts a page in the cache
*
* @param string $pageContent XML content to cache
*/
public function cache($pageContent)
{
if (!$this->shouldBeCached) {
return;
}
file_put_contents($this->filename, $pageContent);
}
}
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