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LegalpadDocumentTitleTransaction.php
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			<?php

			final class LegalpadDocumentTitleTransaction
			extends LegalpadDocumentTransactionType {

			const TRANSACTIONTYPE = 'title';

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

			public function applyInternalEffects($object, $value) {
			$object->setTitle($value);
			$body = $object->getDocumentBody();
			$body->setTitle($value);
			$object->attachDocumentBody($body);
			}

			public function getTitle() {
			$old = $this->getOldValue();

			if (!strlen($old)) {
			return pht(
			'%s created this document.',
			$this->renderAuthor());
			} else {
			return pht(
			'%s renamed this document from %s to %s.',
			$this->renderAuthor(),
			$this->renderOldValue(),
			$this->renderNewValue());
			}
			}

			public function getTitleForFeed() {
			$old = $this->getOldValue();

			if (!strlen($old)) {
			return pht(
			'%s created %s.',
			$this->renderAuthor(),
			$this->renderObject());
			} else {
			return pht(
			'%s renamed %s from %s to %s.',
			$this->renderAuthor(),
			$this->renderObject(),
			$this->renderOldValue(),
			$this->renderNewValue());
			}
			}

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

			if ($this->isEmptyTextTransaction($object->getTitle(), $xactions)) {
			$errors[] = $this->newRequiredError(
			pht('Documents must have a title.'));
			}

			$max_length = $object->getColumnMaximumByteLength('title');
			foreach ($xactions as $xaction) {
			$new_value = $xaction->getNewValue();
			$new_length = strlen($new_value);
			if ($new_length > $max_length) {
			$errors[] = $this->newInvalidError(
			pht('The title can be no longer than %s characters.',
			new PhutilNumber($max_length)));
			}
			}

			return $errors;
			}

			}