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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(),
			PhabricatorCustomField::ROLE_DEFAULT);

			$fields = $field_list->getFields();

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

			return $idx;
			}

			public function getFieldTransactions($value) {
			return array(
			array(
			'type' => $this->getCommitMessageFieldKey(),
			'value' => $value,
			),
			);
			}

			}