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LegalpadDocumentPreambleTransaction.php
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			<?php

			final class LegalpadDocumentPreambleTransaction
			extends LegalpadDocumentTransactionType {

			// TODO: This is misspelled! See T13005.
			const TRANSACTIONTYPE = 'legalpad:premable';

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

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

			public function getTitle() {
			return pht(
			'%s updated the document preamble.',
			$this->renderAuthor());
			}

			public function getTitleForFeed() {
			return pht(
			'%s updated the document preamble for %s.',
			$this->renderAuthor(),
			$this->renderObject());
			}

			public function hasChangeDetailView() {
			return true;
			}

			public function getMailDiffSectionHeader() {
			return pht('CHANGES TO DOCUMENT PREAMBLE');
			}

			public function newChangeDetailView() {
			$viewer = $this->getViewer();

			return id(new PhabricatorApplicationTransactionTextDiffDetailView())
			->setViewer($viewer)
			->setOldText($this->getOldValue())
			->setNewText($this->getNewValue());
			}

			public function newRemarkupChanges() {
			$changes = array();

			$changes[] = $this->newRemarkupChange()
			->setOldValue($this->getOldValue())
			->setNewValue($this->getNewValue());

			return $changes;
			}


			}