<?php


class Core_Cache {


var $cache;


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


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


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


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


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


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;
	}
}


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;
	}
}


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


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


}// class