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<?php
/**
 *  P2_Cache
 *
 *  (experimental)
 *
 *  require
 *      * (none)
 *
 *  @version 2.2.0
 *  @see     http://code.google.com/p/p2-php-framework/
 *  @license The MIT license (http://www.opensource.org/licenses/mit-license.php)
 */
class P2_Cache {
	static private $_dirPath;
	private $_path;
	private $_hasCache;
	
	public static function setDir($dirPath = '/tmp') {
		self::$_dirPath = $dirPath;
	}
	
	public function __construct($key, $duration = 3600) {
		$this->_path = self::$_dirPath . '/' . $key;
		
		$this->_hasCache = (
			is_file($this->_path) &&
			filemtime($this->_path) + $duration > time()
		);
	}
	/**
	 *	@return	boolean	—LŒø‚ȃLƒƒƒbƒVƒ…‚ðo—Í‚µ‚½‚©‚Ç‚¤‚©
	 */
	public function start() {
		if ($this->_hasCache) {
			echo file_get_contents($this->_path);
			return true;
		} else {
			ob_start();
			return false;
		}
	}
	
	public function end() {
		file_put_contents($this->_path, ob_get_flush());
	}
	
	public function clear() {
		unlink($this->_path);
	}
	
	public function hasCache() {
		return $this->_hasCache;
	}
}