IsNull.php
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IsNull.php
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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;
	}
	}