DiffusionDiffQuery.php
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	<?php

	/*
	* Copyright 2012 Facebook, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	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();
	}

	}