DiffusionDiffQuery.php
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			<?php

			abstract class DiffusionDiffQuery extends DiffusionQuery {

			protected $renderingReference;

			final public static function newFromDiffusionRequest(
			DiffusionRequest $request) {
			return parent::newQueryObject(__CLASS__, $request);
			}

			final public function getRenderingReference() {
			return $this->renderingReference;
			}

			final public function loadChangeset() {
			return $this->executeQuery();
			}

			protected function getEffectiveCommit() {
			$drequest = $this->getRequest();

			$modified_query = DiffusionLastModifiedQuery::newFromDiffusionRequest(
			$drequest);
			list($commit) = $modified_query->loadLastModification();
			if (!$commit) {
			// TODO: Improve error messages here.
			return null;
			}
			return $commit->getCommitIdentifier();
			}

			}

phab/src/applications/diffusion/query/diff/DiffusionDiffQuery.php60cb9e1cfb1fproduction