PhabricatorNgramsIndexEngineExtension.php
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	<?php

	final class PhabricatorNgramsIndexEngineExtension
	extends PhabricatorIndexEngineExtension {

	const EXTENSIONKEY = 'ngrams';

	public function getExtensionName() {
	return pht('Ngrams Engine');
	}

	public function getIndexVersion($object) {
	$ngrams = $object->newNgrams();
	$map = mpull($ngrams, 'getValue', 'getNgramKey');
	ksort($map);
	$serialized = serialize($map);

	return PhabricatorHash::digestForIndex($serialized);
	}

	public function shouldIndexObject($object) {
	return ($object instanceof PhabricatorNgramsInterface);
	}

	public function indexObject(
	PhabricatorIndexEngine $engine,
	$object) {

	foreach ($object->newNgrams() as $ngram) {
	$ngram->writeNgram($object->getID());
	}
	}

	}