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Filename : Is.php
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<?php
namespace Hamcrest\Core;

/*
 Copyright (c) 2009 hamcrest.org
 */
use Hamcrest\BaseMatcher;
use Hamcrest\Description;
use Hamcrest\Matcher;
use Hamcrest\Util;

/**
 * Decorates another Matcher, retaining the behavior but allowing tests
 * to be slightly more expressive.
 *
 * For example:  assertThat($cheese, equalTo($smelly))
 *          vs.  assertThat($cheese, is(equalTo($smelly)))
 */
class Is extends BaseMatcher
{

    private $_matcher;

    public function __construct(Matcher $matcher)
    {
        $this->_matcher = $matcher;
    }

    public function matches($arg)
    {
        return $this->_matcher->matches($arg);
    }

    public function describeTo(Description $description)
    {
        $description->appendText('is ')->appendDescriptionOf($this->_matcher);
    }

    public function describeMismatch($item, Description $mismatchDescription)
    {
        $this->_matcher->describeMismatch($item, $mismatchDescription);
    }

    /**
     * Decorates another Matcher, retaining the behavior but allowing tests
     * to be slightly more expressive.
     *
     * For example:  assertThat($cheese, equalTo($smelly))
     *          vs.  assertThat($cheese, is(equalTo($smelly)))
     *
     * @factory
     */
    public static function is($value)
    {
        return new self(Util::wrapValueWithIsEqual($value));
    }
}