DifferentialCoreCustomField.php
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	<?php

	/**
	* Base class for Differential fields with storage on the revision object
	* itself. This mostly wraps reading/writing field values to and from the
	* object.
	*/
	abstract class DifferentialCoreCustomField
	extends DifferentialCustomField {

	private $value;
	private $fieldError;

	abstract protected function readValueFromRevision(
	DifferentialRevision $revision);

	protected function writeValueToRevision(
	DifferentialRevision $revision,
	$value) {
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}

	protected function isCoreFieldRequired() {
	return false;
	}

	protected function isCoreFieldValueEmpty($value) {
	if (is_array($value)) {
	return !$value;
	}
	return !strlen(trim($value));
	}

	protected function getCoreFieldRequiredErrorString() {
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}

	public function validateApplicationTransactions(
	PhabricatorApplicationTransactionEditor $editor,
	$type,
	array $xactions) {

	$this->setFieldError(null);

	$errors = parent::validateApplicationTransactions(
	$editor,
	$type,
	$xactions);

	$transaction = null;
	foreach ($xactions as $xaction) {
	$value = $xaction->getNewValue();
	if ($this->isCoreFieldRequired()) {
	if ($this->isCoreFieldValueEmpty($value)) {
	$error = new PhabricatorApplicationTransactionValidationError(
	$type,
	pht('Required'),
	$this->getCoreFieldRequiredErrorString(),
	$xaction);
	$error->setIsMissingFieldError(true);
	$errors[] = $error;
	$this->setFieldError(pht('Required'));
	}
	}
	}

	return $errors;
	}

	public function canDisableField() {
	return false;
	}

	public function shouldAppearInApplicationTransactions() {
	return true;
	}

	public function shouldAppearInEditView() {
	return true;
	}

	public function readValueFromObject(PhabricatorCustomFieldInterface $object) {
	if ($this->isCoreFieldRequired()) {
	$this->setFieldError(true);
	}
	$this->setValue($this->readValueFromRevision($object));
	}

	public function getOldValueForApplicationTransactions() {
	return $this->readValueFromRevision($this->getObject());
	}

	public function getNewValueForApplicationTransactions() {
	return $this->getValue();
	}

	public function applyApplicationTransactionInternalEffects(
	PhabricatorApplicationTransaction $xaction) {
	$this->writeValueToRevision($this->getObject(), $xaction->getNewValue());
	}

	public function setFieldError($field_error) {
	$this->fieldError = $field_error;
	return $this;
	}

	public function getFieldError() {
	return $this->fieldError;
	}

	public function setValue($value) {
	$this->value = $value;
	return $this;
	}

	public function getValue() {
	return $this->value;
	}

	public function readValueFromCommitMessage($value) {
	$this->setValue($value);
	return $this;
	}

	public function renderCommitMessageValue(array $handles) {
	return $this->getValue();
	}

	public function getConduitDictionaryValue() {
	return $this->getValue();
	}

	}

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