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    <h3>Editing: FeatureMatcher.php</h3>
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namespace Hamcrest;

/*
 Copyright (c) 2009 hamcrest.org
 */

/**
 * Supporting class for matching a feature of an object. Implement
 * &lt;code&gt;featureValueOf()&lt;/code&gt; in a subclass to pull out the feature to be
 * matched against.
 */
abstract class FeatureMatcher extends TypeSafeDiagnosingMatcher
{

    private $_subMatcher;
    private $_featureDescription;
    private $_featureName;

    /**
     * Constructor.
     *
     * @param string $type
     * @param string $subtype
     * @param \Hamcrest\Matcher $subMatcher The matcher to apply to the feature
     * @param string $featureDescription Descriptive text to use in describeTo
     * @param string $featureName Identifying text for mismatch message
     */
    public function __construct($type, $subtype, Matcher $subMatcher, $featureDescription, $featureName)
    {
        parent::__construct($type, $subtype);

        $this-&gt;_subMatcher = $subMatcher;
        $this-&gt;_featureDescription = $featureDescription;
        $this-&gt;_featureName = $featureName;
    }

    /**
     * Implement this to extract the interesting feature.
     *
     * @param mixed $actual the target object
     *
     * @return mixed the feature to be matched
     */
    abstract protected function featureValueOf($actual);

    public function matchesSafelyWithDiagnosticDescription($actual, Description $mismatchDescription)
    {
        $featureValue = $this-&gt;featureValueOf($actual);

        if (!$this-&gt;_subMatcher-&gt;matches($featureValue)) {
            $mismatchDescription-&gt;appendText($this-&gt;_featureName)
                                                    -&gt;appendText(' was ')-&gt;appendValue($featureValue);

            return false;
        }

        return true;
    }

    final public function describeTo(Description $description)
    {
        $description-&gt;appendText($this-&gt;_featureDescription)-&gt;appendText(' ')
                                -&gt;appendDescriptionOf($this-&gt;_subMatcher)
                             ;
    }
}
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