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<?php
namespace Hamcrest;

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

/**
 * A matcher over acceptable values.
 * A matcher is able to describe itself to give feedback when it fails.
 * 
 * Matcher implementations should NOT directly implement this interface.
 * Instead, extend the {@link Hamcrest\BaseMatcher} abstract class,
 * which will ensure that the Matcher API can grow to support
 * new features and remain compatible with all Matcher implementations.
 * 
 * For easy access to common Matcher implementations, use the static factory
 * methods in {@link Hamcrest\CoreMatchers}.
 *
 * @see Hamcrest\CoreMatchers
 * @see Hamcrest\BaseMatcher
 */
interface Matcher extends SelfDescribing
{

/**
 * Evaluates the matcher for argument <var>$item</var>.
 *
 * @param mixed $item the object against which the matcher is evaluated.
 *
 * @return boolean <code>true</code> if <var>$item</var> matches,
 * otherwise <code>false</code>.
 *
 * @see Hamcrest\BaseMatcher
 */
 public function matches($item);

/**
 * Generate a description of why the matcher has not accepted the item.
 * The description will be part of a larger description of why a matching
 * failed, so it should be concise.
 * This method assumes that <code>matches($item)</code> is false, but
 * will not check this.
 *
 * @param mixed $item The item that the Matcher has rejected.
 * @param Description $description
 * @return
 */
 public function describeMismatch($item, Description $description);
}

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