1 // Copyright 2017 The Bazel Authors. All rights reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 package com.google.devtools.build.android.desugar.testdata.java8; 15 16 import java.util.List; 17 import java.util.stream.Collectors; 18 import java.util.stream.Stream; 19 20 /** 21 * Desugar test input interface that declares lambdas and method references in default and static 22 * interface methods. 23 */ 24 public interface InterfaceMethod { defaultMethodReference(List<String> names)25 public default List<String> defaultMethodReference(List<String> names) { 26 return names.stream().filter(this::startsWithS).collect(Collectors.toList()); 27 } 28 defaultInvokingBootclasspathMethods(String expectedValue)29 public default String defaultInvokingBootclasspathMethods(String expectedValue) { 30 return Stream.of(expectedValue).findFirst().orElse("unexpected"); 31 } 32 staticMethodReference(List<String> names)33 public default List<String> staticMethodReference(List<String> names) { 34 return names.stream().filter(InterfaceMethod::startsWithA).collect(Collectors.toList()); 35 } 36 lambdaCallsDefaultMethod(List<String> names)37 public default List<String> lambdaCallsDefaultMethod(List<String> names) { 38 return names.stream().filter(s -> startsWithS(s)).collect(Collectors.toList()); 39 } 40 startsWithA(String input)41 public static boolean startsWithA(String input) { 42 return input.startsWith("A"); 43 } 44 startsWithS(String input)45 public default boolean startsWithS(String input) { 46 return input.startsWith("S"); 47 } 48 49 /** 50 * Empty class implementing {@link InterfaceMethod} so the test can instantiate and call default 51 * methods. 52 */ 53 public static class Concrete implements InterfaceMethod {} 54 } 55