<?php
/* $Id$ */
namespace Mammut\Cache;

(defined('MAMMUT') && (basename(__FILE__) != basename($_SERVER['PHP_SELF']))) or die('ACCESS DENIED');

/**
 * Simple cache that stores values only in local variables.
 * 
 * @author Stefan Daurer <s.daurer@q-spot.org>
 * @package Mammut\Cache
 */
class Simple extends \Mammut\StrictObject implements \Mammut\Cache\iCache {
	protected $datastore = array();
	private $hits = 0;

	public function __construct() {
	}

	public function set($key, $value, $ttl) {
		if ($value instanceof \Closure)
			$this->datastore[$key] = $value();
		else
			$this->datastore[$key] = $value;
	}

	public function get($key, $default = NULL) {
		if(isset($this->datastore[$key])) {
			$this->hits++;
			return $this->datastore[$key];
		}
		if ($default instanceof \Closure)
			return $default();
		return $default;
	}

	public function delete($key) {
		if(isset($this->datastore[$key]))
			unset($this->datastore[$key]);
	}

	public function keyExists($key) {
		return isset($this->datastore[$key]);
	}

	public function clear() {
		$this->datastore = array();
	}

	public function getHits() {
		return $this->hits;
	}
}