AphrontBarView.php
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	<?php

	abstract class AphrontBarView extends AphrontView {

	private $color;
	private $caption = '';

	const COLOR_DEFAULT = 'default';
	const COLOR_WARNING = 'warning';
	const COLOR_DANGER = 'danger';

	const COLOR_AUTO_BADNESS = 'auto_badness'; // more = bad! :(
	const COLOR_AUTO_GOODNESS = 'auto_goodness'; // more = good! :)

	const THRESHOLD_DANGER = 0.85;
	const THRESHOLD_WARNING = 0.75;

	abstract protected function getRatio();

	abstract protected function getDefaultColor();

	final public function setColor($color) {
	$this->color = $color;
	return $this;
	}

	final public function setCaption($text) {
	$this->caption = $text;
	return $this;
	}

	final protected function getColor() {
	$color = $this->color;
	if (!$color) {
	$color = $this->getDefaultColor();
	}

	switch ($color) {
	case self::COLOR_DEFAULT:
	case self::COLOR_WARNING:
	case self::COLOR_DANGER:
	return $color;
	}

	$ratio = $this->getRatio();
	if ($color === self::COLOR_AUTO_GOODNESS) {
	$ratio = 1.0 - $ratio;
	}

	if ($ratio >= self::THRESHOLD_DANGER) {
	return self::COLOR_DANGER;
	} else if ($ratio >= self::THRESHOLD_WARNING) {
	return self::COLOR_WARNING;
	} else {
	return self::COLOR_DEFAULT;
	}
	}

	final protected function getCaption() {
	return $this->caption;
	}

	}