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PhabricatorFulltextEngine.php
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			<?php

			abstract class PhabricatorFulltextEngine
			extends Phobject {

			private $object;

			public function setObject($object) {
			$this->object = $object;
			return $this;
			}

			public function getObject() {
			return $this->object;
			}

			protected function getViewer() {
			return PhabricatorUser::getOmnipotentUser();
			}

			abstract protected function buildAbstractDocument(
			PhabricatorSearchAbstractDocument $document,
			$object);

			final public function buildFulltextIndexes() {
			$object = $this->getObject();

			$extensions = PhabricatorFulltextEngineExtension::getAllExtensions();

			$enrich_extensions = array();
			$index_extensions = array();
			foreach ($extensions as $key => $extension) {
			if ($extension->shouldEnrichFulltextObject($object)) {
			$enrich_extensions[] = $extension;
			}

			if ($extension->shouldIndexFulltextObject($object)) {
			$index_extensions[] = $extension;
			}
			}

			$document = $this->newAbstractDocument($object);

			$this->buildAbstractDocument($document, $object);

			foreach ($enrich_extensions as $extension) {
			$extension->enrichFulltextObject($object, $document);
			}

			foreach ($index_extensions as $extension) {
			$extension->indexFulltextObject($object, $document);
			}

			PhabricatorSearchService::reindexAbstractDocument($document);
			}

			protected function newAbstractDocument($object) {
			$phid = $object->getPHID();
			return id(new PhabricatorSearchAbstractDocument())
			->setPHID($phid)
			->setDocumentType(phid_get_type($phid));
			}

			}