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<?php
/**
* This file is part of vfsStream.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @package org\bovigo\vfs
*/
namespace org\bovigo\vfs;
/**
* Represents a quota for disk space.
*
* @since 1.1.0
* @internal
*/
class Quota
{
/**
* unlimited quota
*/
const UNLIMITED = -1;
/**
* quota in bytes
*
* A value of -1 is treated as unlimited.
*
* @type int
*/
private $amount;
/**
* constructor
*
* @param int $amount quota in bytes
*/
public function __construct($amount)
{
$this->amount = $amount;
}
/**
* create with unlimited space
*
* @return Quota
*/
public static function unlimited()
{
return new self(self::UNLIMITED);
}
/**
* checks if a quota is set
*
* @return bool
*/
public function isLimited()
{
return self::UNLIMITED < $this->amount;
}
/**
* checks if given used space exceeda quota limit
*
*
* @param int $usedSpace
* @return int
*/
public function spaceLeft($usedSpace)
{
if (self::UNLIMITED === $this->amount) {
return $usedSpace;
}
if ($usedSpace >= $this->amount) {
return 0;
}
$spaceLeft = $this->amount - $usedSpace;
if (0 >= $spaceLeft) {
return 0;
}
return $spaceLeft;
}
}