@@ -0,0 +1,1639 @@
+/*%0A * Licensed under the Apache License, Version 2.0 (the %22License%22);%0A * you may not use this file except in compliance with the License.%0A * You may obtain a copy of the License at%0A *%0A *     http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A */%0Apackage com.facebook.presto.tpch.util;%0A%0Aimport java.util.Optional;%0Aimport java.util.function.BiFunction;%0Aimport java.util.function.BinaryOperator;%0A%0Aimport static com.google.common.base.Preconditions.checkArgument;%0A%0Apublic class Optionals%0A%7B%0A    private Optionals() %7B%7D%0A%0A    public static %3CT%3E Optional%3CT%3E checkPresent(Optional%3CT%3E optional)%0A    %7B%0A        checkArgument(optional.isPresent(), %22Expected a present optional, got empty()%22);%0A        return optional;%0A    %7D%0A%0A    public static %3CS, T, R%3E Optional%3CR%3E withBoth(Optional%3C? extends S%3E left, Optional%3C? extends T%3E right, BiFunction%3CS, T, R%3E binaryFunction)%0A    %7B%0A        return left.flatMap(l -%3E right.map(r -%3E binaryFunction.apply(l, r)));%0A    %7D%0A%0A    public static %3CT%3E Optional%3CT%3E combine(Optional%3CT%3E left, Optional%3CT%3E right, BinaryOperator%3CT%3E combiner)%0A    %7B%0A        if (left.isPresent() && right.isPresent()) %7B%0A            return Optional.of(combiner.apply(left.get(), right.get()));%0A        %7D%0A        else if (left.isPresent()) %7B%0A            return left;%0A        %7D%0A        else %7B%0A            return right;%0A        %7D%0A    %7D%0A%7D%0A

Add Optionals.{checkPresent,withBoth,combine} util methods