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DifferentialRawDiffRenderer.php
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			<?php

			final class DifferentialRawDiffRenderer extends Phobject {

			private $changesets;
			private $format = 'unified';
			private $viewer;
			private $byteLimit;

			public function setFormat($format) {
			$this->format = $format;
			return $this;
			}

			public function getFormat() {
			return $this->format;
			}

			public function setChangesets(array $changesets) {
			assert_instances_of($changesets, 'DifferentialChangeset');

			$this->changesets = $changesets;
			return $this;
			}

			public function getChangesets() {
			return $this->changesets;
			}

			public function setViewer(PhabricatorUser $viewer) {
			$this->viewer = $viewer;
			return $this;
			}

			public function getViewer() {
			return $this->viewer;
			}

			public function setByteLimit($byte_limit) {
			$this->byteLimit = $byte_limit;
			return $this;
			}

			public function getByteLimit() {
			return $this->byteLimit;
			}

			public function buildPatch() {
			$diff = new DifferentialDiff();
			$diff->attachChangesets($this->getChangesets());

			$raw_changes = $diff->buildChangesList();
			$changes = array();
			foreach ($raw_changes as $changedict) {
			$changes[] = ArcanistDiffChange::newFromDictionary($changedict);
			}

			$viewer = $this->getViewer();
			$loader = id(new PhabricatorFileBundleLoader())
			->setViewer($viewer);

			$bundle = ArcanistBundle::newFromChanges($changes);
			$bundle->setLoadFileDataCallback(array($loader, 'loadFileData'));

			$byte_limit = $this->getByteLimit();
			if ($byte_limit) {
			$bundle->setByteLimit($byte_limit);
			}

			$format = $this->getFormat();
			switch ($format) {
			case 'git':
			return $bundle->toGitPatch();
			case 'unified':
			default:
			return $bundle->toUnifiedDiff();
			}
			}
			}