PhabricatorSelectSetting.php
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	<?php

	abstract class PhabricatorSelectSetting
	extends PhabricatorSetting {

	abstract protected function getSelectOptions();

	final protected function newCustomEditField($object) {
	$setting_key = $this->getSettingKey();
	$default_value = $object->getDefaultValue($setting_key);

	$options = $this->getSelectOptions();

	if (isset($options[$default_value])) {
	$default_label = pht('Default (%s)', $options[$default_value]);
	} else {
	$default_label = pht('Default (Unknown, "%s")', $default_value);
	}

	if (empty($options[''])) {
	$options = array(
	'' => $default_label,
	) + $options;
	}

	return $this->newEditField($object, new PhabricatorSelectEditField())
	->setOptions($options);
	}

	final public function validateTransactionValue($value) {
	if (!strlen($value)) {
	return;
	}

	$options = $this->getSelectOptions();

	if (!isset($options[$value])) {
	throw new Exception(
	pht(
	'Value "%s" is not valid for setting "%s": valid values are %s.',
	$value,
	$this->getSettingName(),
	implode(', ', array_keys($options))));
	}

	return;
	}

	public function getTransactionNewValue($value) {
	if (!strlen($value)) {
	return null;
	}

	return (string)$value;
	}

	}