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Revision Autor Zeilennr. Zeile
148 lars 1 
<?php
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namespace Hamcrest\Collection;
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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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 * Matches if traversable is empty or non-empty.
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 */
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class IsEmptyTraversable 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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    private $_empty;
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    public function __construct($empty = true)
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    {
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        $this->_empty = $empty;
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    }
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    public function matches($item)
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    {
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        if (!$item instanceof \Traversable) {
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            return false;
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        }
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        foreach ($item as $value) {
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            return !$this->_empty;
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        }
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        return $this->_empty;
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    }
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    public function describeTo(Description $description)
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    {
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        $description->appendText($this->_empty ? 'an empty traversable' : 'a non-empty traversable');
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    }
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    /**
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     * Returns true if traversable is empty.
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     *
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     * @factory
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     */
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    public static function emptyTraversable()
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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::$_INSTANCE;
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    }
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    /**
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     * Returns true if traversable is not empty.
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     *
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     * @factory
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     */
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    public static function nonEmptyTraversable()
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    {
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        if (!self::$_NOT_INSTANCE) {
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            self::$_NOT_INSTANCE = new self(false);
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        }
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        return self::$_NOT_INSTANCE;
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    }
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}