| // Copyright 2017 The Bazel Authors. All rights reserved. |
| // |
| // 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. |
| package com.google.devtools.build.android.desugar.testdata.java8; |
| |
| import java.util.List; |
| import java.util.function.Function; |
| import java.util.stream.Collectors; |
| |
| /** Desugaring test input interface that includes a default method and a static method. */ |
| public interface FunctionWithDefaultMethod<T extends Number> extends Function<T, T> { |
| |
| @Override |
| T apply(T input); |
| |
| static <T extends Number> Function<T, Long> toLong() { |
| return input -> input.longValue(); |
| } |
| |
| default T twice(T input) { |
| return apply(apply(input)); |
| } |
| |
| /** Don't call this method from tests, it won't work since Desugar moves it! */ |
| static FunctionWithDefaultMethod<Integer> inc(int add) { |
| return input -> input + add; |
| } |
| |
| /** |
| * Implementation of {@link FunctionWithDefaultMethod} that overrides the default method. Also |
| * declares static methods the test uses to exercise the code in this file. |
| */ |
| public static class DoubleInts implements FunctionWithDefaultMethod<Integer> { |
| @Override |
| public Integer apply(Integer input) { |
| return 2 * input; |
| } |
| |
| @Override |
| public Integer twice(Integer input) { |
| return 5 * input; // deliberately wrong :) |
| } |
| |
| public static List<Long> add(List<Integer> ints, int add) { |
| return ints.stream().map(inc(add)).map(toLong()).collect(Collectors.toList()); |
| } |
| |
| public static FunctionWithDefaultMethod<Integer> doubleLambda() { |
| return input -> 2 * input; |
| } |
| |
| public static FunctionWithDefaultMethod<Integer> incTwice(int add) { |
| return inc(add)::twice; |
| } |
| |
| public static FunctionWithDefaultMethod<Integer> times5() { |
| return new DoubleInts2()::twice; |
| } |
| |
| public static Function<Integer, FunctionWithDefaultMethod<Integer>> incFactory() { |
| return FunctionWithDefaultMethod::inc; |
| } |
| } |
| |
| /** Empty subclass that explicitly implements the interface the superclass already implements. */ |
| public static class DoubleInts2 extends DoubleInts |
| implements FunctionWithDefaultMethod<Integer> {} |
| } |