PhabricatorObjectGraph.php
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	<?php

	/*
	* Copyright 2011 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.
	*/

	final class PhabricatorObjectGraph extends AbstractDirectedGraph {

	private $edgeType;

	public function setEdgeType($edge_type) {
	$this->edgeType = $edge_type;
	return $this;
	}

	protected function loadEdges(array $nodes) {
	if (!$this->edgeType) {
	throw new Exception("Set edge type before loading graph!");
	}

	$handle_data = new PhabricatorObjectHandleData($nodes);
	$objects = $handle_data->loadObjects();

	$result = array();
	foreach ($nodes as $phid) {
	$object = idx($objects, $phid);
	if ($object) {
	$result[$phid] = $object->getAttachedPHIDs($this->edgeType);
	} else {
	$result[$phid] = array();
	}
	}

	return $result;
	}

	}