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HeraldRuleIndexEngineExtension.php
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			<?php

			final class HeraldRuleIndexEngineExtension
			extends PhabricatorEdgeIndexEngineExtension {

			const EXTENSIONKEY = 'herald.actions';

			public function getExtensionName() {
			return pht('Herald Actions');
			}

			public function shouldIndexObject($object) {
			if (!($object instanceof HeraldRule)) {
			return false;
			}

			return true;
			}

			protected function getIndexEdgeType() {
			return HeraldRuleActionAffectsObjectEdgeType::EDGECONST;
			}

			protected function getIndexDestinationPHIDs($object) {
			$rule = $object;

			$viewer = $this->getViewer();

			$rule = id(new HeraldRuleQuery())
			->setViewer($viewer)
			->withIDs(array($rule->getID()))
			->needConditionsAndActions(true)
			->executeOne();
			if (!$rule) {
			return array();
			}

			$phids = array();

			$fields = HeraldField::getAllFields();
			foreach ($rule->getConditions() as $condition_record) {
			$field = idx($fields, $condition_record->getFieldName());

			if (!$field) {
			continue;
			}

			$affected_phids = $field->getPHIDsAffectedByCondition($condition_record);
			foreach ($affected_phids as $phid) {
			$phids[] = $phid;
			}
			}

			$actions = HeraldAction::getAllActions();
			foreach ($rule->getActions() as $action_record) {
			$action = idx($actions, $action_record->getAction());

			if (!$action) {
			continue;
			}

			foreach ($action->getPHIDsAffectedByAction($action_record) as $phid) {
			$phids[] = $phid;
			}
			}

			$phids = array_fuse($phids);
			return array_keys($phids);
			}

			}