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PhortuneAccountEmailAddressTransaction.php
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			<?php

			final class PhortuneAccountEmailAddressTransaction
			extends PhortuneAccountEmailTransactionType {

			const TRANSACTIONTYPE = 'address';

			public function generateOldValue($object) {
			return $object->getAddress();
			}

			public function applyInternalEffects($object, $value) {
			$object->setAddress($value);
			}

			public function validateTransactions($object, array $xactions) {
			$errors = array();

			if ($this->isEmptyTextTransaction($object->getAddress(), $xactions)) {
			$errors[] = $this->newRequiredError(
			pht('You must provide an email address.'));
			}

			$max_length = $object->getColumnMaximumByteLength('address');
			foreach ($xactions as $xaction) {
			$old_value = $xaction->getOldValue();
			$new_value = $xaction->getNewValue();

			$new_length = strlen($new_value);
			if ($new_length > $max_length) {
			$errors[] = $this->newInvalidError(
			pht(
			'The address can be no longer than %s characters.',
			new PhutilNumber($max_length)),
			$xaction);
			continue;
			}

			if (!PhabricatorUserEmail::isValidAddress($new_value)) {
			$errors[] = $this->newInvalidError(
			PhabricatorUserEmail::describeValidAddresses(),
			$xaction);
			continue;
			}

			if ($new_value !== $old_value) {
			if (!$this->isNewObject()) {
			$errors[] = $this->newInvalidError(
			pht(
			'Account email addresses can not be edited once they are '.
			'created. To change the billing address for an account, '.
			'disable the old address and then add a new address.'),
			$xaction);
			continue;
			}
			}

			}

			return $errors;
			}

			}