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Revision Autor Zeilennr. Zeile
148 lars 1 
<?php
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namespace Hamcrest\Number;
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/*
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 Copyright (c) 2009 hamcrest.org
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 */
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use Hamcrest\Description;
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use Hamcrest\TypeSafeMatcher;
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/**
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 * Is the value a number equal to a value within some range of
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 * acceptable error?
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 */
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class IsCloseTo extends TypeSafeMatcher
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{
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    private $_value;
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    private $_delta;
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    public function __construct($value, $delta)
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    {
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        parent::__construct(self::TYPE_NUMERIC);
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        $this->_value = $value;
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        $this->_delta = $delta;
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    }
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    protected function matchesSafely($item)
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    {
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        return $this->_actualDelta($item) <= 0.0;
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    }
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    protected function describeMismatchSafely($item, Description $mismatchDescription)
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    {
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        $mismatchDescription->appendValue($item)
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                                                ->appendText(' differed by ')
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                                                ->appendValue($this->_actualDelta($item))
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                                                ;
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    }
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    public function describeTo(Description $description)
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    {
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        $description->appendText('a numeric value within ')
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                                ->appendValue($this->_delta)
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                                ->appendText(' of ')
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                                ->appendValue($this->_value)
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                                ;
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    }
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    /**
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     * Matches if value is a number equal to $value within some range of
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     * acceptable error $delta.
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     *
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     * @factory
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     */
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    public static function closeTo($value, $delta)
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    {
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        return new self($value, $delta);
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    }
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    // -- Private Methods
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    private function _actualDelta($item)
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    {
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        return (abs(($item - $this->_value)) - $this->_delta);
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    }
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}