PhabricatorSearchThreeStateField.php
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	<?php

	final class PhabricatorSearchThreeStateField
	extends PhabricatorSearchField {

	private $options;

	public function setOptions($null, $yes, $no) {
	$this->options = array(
	'' => $null,
	'true' => $yes,
	'false' => $no,
	);
	return $this;
	}

	public function getOptions() {
	return $this->options;
	}

	protected function getDefaultValue() {
	return null;
	}

	protected function getValueFromRequest(AphrontRequest $request, $key) {
	if (!strlen($request->getStr($key))) {
	return null;
	}
	return $request->getBool($key);
	}

	protected function newControl() {
	return id(new AphrontFormSelectControl())
	->setOptions($this->getOptions());
	}

	protected function getValueForControl() {
	$value = parent::getValueForControl();
	if ($value === true) {
	return 'true';
	}
	if ($value === false) {
	return 'false';
	}
	return null;
	}

	}