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Revision Autor Zeilennr. Zeile
148 lars 1 
<?php
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namespace Hamcrest\Core;
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/*
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 Copyright (c) 2009 hamcrest.org
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 */
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use Hamcrest\BaseMatcher;
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use Hamcrest\Description;
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/**
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 * Is the value null?
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 */
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class IsNull extends BaseMatcher
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{
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    private static $_INSTANCE;
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    private static $_NOT_INSTANCE;
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    public function matches($item)
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    {
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        return is_null($item);
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    }
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    public function describeTo(Description $description)
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    {
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        $description->appendText('null');
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    }
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    /**
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     * Matches if value is null.
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     *
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     * @factory
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     */
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    public static function nullValue()
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    {
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        if (!self::$_INSTANCE) {
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            self::$_INSTANCE = new self();
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        }
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        return self::$_INSTANCE;
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    }
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    /**
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     * Matches if value is not null.
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     *
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     * @factory
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     */
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    public static function notNullValue()
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    {
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        if (!self::$_NOT_INSTANCE) {
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            self::$_NOT_INSTANCE = IsNot::not(self::nullValue());
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        }
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        return self::$_NOT_INSTANCE;
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    }
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}