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Revision Autor Zeilennr. Zeile
148 lars 1 
<?php
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namespace Hamcrest\Text;
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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\Core\AnyOf;
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use Hamcrest\Core\IsNull;
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use Hamcrest\Description;
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/**
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 * Matches empty Strings (and null).
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 */
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class IsEmptyString extends BaseMatcher
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{
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    private static $_INSTANCE;
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    private static $_NULL_OR_EMPTY_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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        return $this->_empty
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            ? ($item === '')
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            : is_string($item) && $item !== '';
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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 string' : 'a non-empty string');
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    }
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    /**
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     * Matches if value is a zero-length string.
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     *
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     * @factory emptyString
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     */
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    public static function isEmptyString()
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    {
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        if (!self::$_INSTANCE) {
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            self::$_INSTANCE = new self(true);
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        }
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        return self::$_INSTANCE;
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    }
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    /**
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     * Matches if value is null or a zero-length string.
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     *
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     * @factory nullOrEmptyString
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     */
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    public static function isEmptyOrNullString()
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    {
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        if (!self::$_NULL_OR_EMPTY_INSTANCE) {
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            self::$_NULL_OR_EMPTY_INSTANCE = AnyOf::anyOf(
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                IsNull::nullvalue(),
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                self::isEmptyString()
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            );
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        }
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        return self::$_NULL_OR_EMPTY_INSTANCE;
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    }
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    /**
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     * Matches if value is a non-zero-length string.
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     *
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     * @factory nonEmptyString
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     */
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    public static function isNonEmptyString()
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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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}