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<?php
namespace Hamcrest\Number;
/*
Copyright (c) 2009 hamcrest.org
*/
use Hamcrest\Description;
use Hamcrest\TypeSafeMatcher;
/**
* Is the value a number equal to a value within some range of
* acceptable error?
*/
class IsCloseTo extends TypeSafeMatcher
{
private $_value;
private $_delta;
public function __construct($value, $delta)
{
parent::__construct(self::TYPE_NUMERIC);
$this->_value = $value;
$this->_delta = $delta;
}
protected function matchesSafely($item)
{
return $this->_actualDelta($item) <= 0.0;
}
protected function describeMismatchSafely($item, Description $mismatchDescription)
{
$mismatchDescription->appendValue($item)
->appendText(' differed by ')
->appendValue($this->_actualDelta($item))
;
}
public function describeTo(Description $description)
{
$description->appendText('a numeric value within ')
->appendValue($this->_delta)
->appendText(' of ')
->appendValue($this->_value)
;
}
/**
* Matches if value is a number equal to $value within some range of
* acceptable error $delta.
*
* @factory
*/
public static function closeTo($value, $delta)
{
return new self($value, $delta);
}
// -- Private Methods
private function _actualDelta($item)
{
return (abs(($item - $this->_value)) - $this->_delta);
}
}