DifferentialCommitMessageCustomField.php
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	<?php

	abstract class DifferentialCommitMessageCustomField
	extends DifferentialCommitMessageField {

	abstract public function getCustomFieldKey();

	public function getFieldOrder() {
	$custom_key = $this->getCustomFieldKey();
	return 100000 + $this->getCustomFieldOrder($custom_key);
	}

	public function isFieldEnabled() {
	$custom_key = $this->getCustomFieldKey();
	return $this->isCustomFieldEnabled($custom_key);
	}

	public function readFieldValueFromObject(DifferentialRevision $revision) {
	$custom_key = $this->getCustomFieldKey();
	$value = $this->readCustomFieldValue($revision, $custom_key);
	return $value;
	}

	protected function readFieldValueFromCustomFieldStorage($value) {
	return $value;
	}

	protected function readJSONFieldValueFromCustomFieldStorage(
	$value,
	$default) {
	try {
	return phutil_json_decode($value);
	} catch (PhutilJSONParserException $ex) {
	return $default;
	}
	}

	protected function readCustomFieldValue(
	DifferentialRevision $revision,
	$key) {
	$value = idx($this->getCustomFieldStorage(), $key);
	return $this->readFieldValueFromCustomFieldStorage($value);
	}

	protected function getCustomFieldOrder($key) {
	$field_list = PhabricatorCustomField::getObjectFields(
	new DifferentialRevision(),
	DifferentialCustomField::ROLE_COMMITMESSAGE);

	$fields = $field_list->getFields();

	$idx = 0;
	foreach ($fields as $field_key => $value) {
	if ($key === $field_key) {
	return $idx;
	}
	$idx++;
	}

	return $idx;
	}

	}