1^/\*$ 2^ \* Copyright \d\d\d\d(-\d\d)?, OpenCensus Authors$ 3^ \*$ 4^ \* Licensed under the Apache License, Version 2.0 \(the "License"\);$ 5^ \* you may not use this file except in compliance with the License\.$ 6^ \* You may obtain a copy of the License at$ 7^ \*$ 8^ \* http://www.apache.org/licenses/LICENSE-2\.0$ 9^ \*$ 10^ \* Unless required by applicable law or agreed to in writing, software$ 11^ \* distributed under the License is distributed on an "AS IS" BASIS,$ 12^ \* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied\.$ 13^ \* See the License for the specific language governing permissions and$ 14^ \* limitations under the License\.$ 15^ \*/$