testing

DifferentialFieldSelector.php
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			<?php

			/*
			* Copyright 2012 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.
			*/

			abstract class DifferentialFieldSelector {

			final public function __construct() {
			// <empty>
			}

			final public static function newSelector() {
			return PhabricatorEnv::newObjectFromConfig('differential.field-selector');
			}

			abstract public function getFieldSpecifications();

			public function sortFieldsForRevisionList(array $fields) {
			assert_instances_of($fields, 'DifferentialFieldSpecification');
			return $fields;
			}

			public function sortFieldsForMail(array $fields) {
			assert_instances_of($fields, 'DifferentialFieldSpecification');
			return $fields;
			}

			}