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DiffusionLowLevelQuery.php
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			<?php

			abstract class DiffusionLowLevelQuery extends Phobject {

			private $repository;

			abstract protected function executeQuery();

			public function setRepository(PhabricatorRepository $repository) {
			$this->repository = $repository;
			return $this;
			}

			public function getRepository() {
			return $this->repository;
			}

			public function execute() {
			if (!$this->getRepository()) {
			throw new PhutilInvalidStateException('setRepository');
			}

			return $this->executeQuery();
			}

			protected function filterRefsByType(array $refs, array $types) {
			$type_map = array_fuse($types);

			foreach ($refs as $name => $ref_list) {
			foreach ($ref_list as $key => $ref) {
			if (empty($type_map[$ref['type']])) {
			unset($refs[$name][$key]);
			}
			}
			if (!$refs[$name]) {
			unset($refs[$name]);
			}
			}

			return $refs;
			}

			}