IsEmptyTraversable.php
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IsEmptyTraversable.php
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	<?php
	namespace Hamcrest\Collection;

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

	/**
	* Matches if traversable is empty or non-empty.
	*/
	class IsEmptyTraversable extends BaseMatcher
	{

	private static $_INSTANCE;
	private static $_NOT_INSTANCE;

	private $_empty;

	public function __construct($empty = true)
	{
	$this->_empty = $empty;
	}

	public function matches($item)
	{
	if (!$item instanceof \Traversable) {
	return false;
	}

	foreach ($item as $value) {
	return !$this->_empty;
	}

	return $this->_empty;
	}

	public function describeTo(Description $description)
	{
	$description->appendText($this->_empty ? 'an empty traversable' : 'a non-empty traversable');
	}

	/**
	* Returns true if traversable is empty.
	*
	* @factory
	*/
	public static function emptyTraversable()
	{
	if (!self::$_INSTANCE) {
	self::$_INSTANCE = new self;
	}

	return self::$_INSTANCE;
	}

	/**
	* Returns true if traversable is not empty.
	*
	* @factory
	*/
	public static function nonEmptyTraversable()
	{
	if (!self::$_NOT_INSTANCE) {
	self::$_NOT_INSTANCE = new self(false);
	}

	return self::$_NOT_INSTANCE;
	}
	}