17f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael// Copyright 2017 The Bazel Authors. All rights reserved. 27f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael// 37f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael// Licensed under the Apache License, Version 2.0 (the "License"); 47f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael// you may not use this file except in compliance with the License. 57f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael// You may obtain a copy of the License at 67f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael// 77f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael// http://www.apache.org/licenses/LICENSE-2.0 87f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael// 97f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael// Unless required by applicable law or agreed to in writing, software 107f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael// distributed under the License is distributed on an "AS IS" BASIS, 117f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 127f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael// See the License for the specific language governing permissions and 137f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael// limitations under the License. 147f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichaelpackage com.google.devtools.build.android.desugar.testdata.java8; 157f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael 167f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichaelimport java.util.List; 177f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichaelimport java.util.function.Function; 187f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichaelimport java.util.stream.Collectors; 197f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael 207f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael/** Desugaring test input interface that includes a default method and a static method. */ 217f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichaelpublic interface FunctionWithDefaultMethod<T extends Number> extends Function<T, T> { 227f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael 237f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael @Override 247f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael T apply(T input); 257f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael 267f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael static <T extends Number> Function<T, Long> toLong() { 277f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael return input -> input.longValue(); 287f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael } 297f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael 307f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael default T twice(T input) { 317f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael return apply(apply(input)); 327f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael } 337f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael 347f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael /** Don't call this method from tests, it won't work since Desugar moves it! */ 357f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael static FunctionWithDefaultMethod<Integer> inc(int add) { 367f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael return input -> input + add; 377f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael } 387f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael 397f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael /** 407f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael * Implementation of {@link FunctionWithDefaultMethod} that overrides the default method. 417f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael * Also declares static methods the test uses to exercise the code in this file. 427f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael */ 437f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael public static class DoubleInts implements FunctionWithDefaultMethod<Integer> { 447f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael @Override 457f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael public Integer apply(Integer input) { 467f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael return 2 * input; 477f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael } 487f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael 497f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael @Override 507f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael public Integer twice(Integer input) { 517f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael return 5 * input; // deliberately wrong :) 527f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael } 537f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael 547f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael public static List<Long> add(List<Integer> ints, int add) { 557f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael return ints.stream().map(inc(add)).map(toLong()).collect(Collectors.toList()); 567f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael } 577f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael 587f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael public static FunctionWithDefaultMethod<Integer> doubleLambda() { 597f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael return input -> 2 * input; 607f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael } 617f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael 627f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael public static FunctionWithDefaultMethod<Integer> incTwice(int add) { 637f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael return inc(add)::twice; 647f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael } 657f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael 667f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael public static FunctionWithDefaultMethod<Integer> times5() { 677f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael return new DoubleInts2()::twice; 687f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael } 697f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael 707f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael public static Function<Integer, FunctionWithDefaultMethod<Integer>> incFactory() { 717f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael return FunctionWithDefaultMethod::inc; 727f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael } 737f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael } 747f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael 757f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael /** Empty subclass that explicitly implements the interface the superclass already implements. */ 767f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael public static class DoubleInts2 extends DoubleInts implements FunctionWithDefaultMethod<Integer> { 777f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael } 787f6f08b9b78fd02cdea4157980a42b576ae3c504ajmichael} 79