<?php


class Core_Cache {

	var $cache;

	public function __construct() {
		$this->cache = array();
	}

	public static function &getInstance() {
		static $_instance;
		if (!is_object($_instance)) {
			$_instance = new Core_Cache();
		}
		return $_instance;
	}

	public static function get($key, $default = null) {
		return self::getInstance()->_get($key, $default);
	}

	public static function get_and_clean($key, $default = null) {
		return self::getInstance()->_get_and_clean($key, $default);
	}

	public static function set($key, $value) {
		return self::getInstance()->_set($key, $value);
	}

	public function &_get($key, $default = null) {
		$null = null;
		if ($key === null) return $null;
		if (array_key_exists($key, $this->cache)) {
			return $this->cache[$key];
		} else {
			return $default;
		}
	}

	public function &_get_and_clean($key, $default = null) {
		if (array_key_exists($key, $this->cache)) {
			$ret = $this->cache[$key];
			unset($this->cache[$key]);
			return $ret;
		} else {
			return $default;
		}
	}

	public function _set($key, $value) {
		$this->cache[$key] = $value;
		return true;
	}

	public function dbg() {
		return self::_('dbg','all','values');
	}

}