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<?php
namespace Hamcrest\Core;
/*
Copyright (c) 2009 hamcrest.org
*/
use Hamcrest\BaseMatcher;
use Hamcrest\Description;
/**
* Is the value null?
*/
class IsNull extends BaseMatcher
{
private static $_INSTANCE;
private static $_NOT_INSTANCE;
public function matches($item)
{
return is_null($item);
}
public function describeTo(Description $description)
{
$description->appendText('null');
}
/**
* Matches if value is null.
*
* @factory
*/
public static function nullValue()
{
if (!self::$_INSTANCE) {
self::$_INSTANCE = new self();
}
return self::$_INSTANCE;
}
/**
* Matches if value is not null.
*
* @factory
*/
public static function notNullValue()
{
if (!self::$_NOT_INSTANCE) {
self::$_NOT_INSTANCE = IsNot::not(self::nullValue());
}
return self::$_NOT_INSTANCE;
}
}
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