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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;
			}

			protected function newConduitParameterType() {
			return new ConduitBoolParameterType();
			}

			}