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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; } }