1 files changed, 78 insertions, 0 deletions
diff --git a/src/test/java/com/google/devtools/build/android/desugar/testdata/java8/FunctionWithDefaultMethod.java b/src/test/java/com/google/devtools/build/android/desugar/testdata/java8/FunctionWithDefaultMethod.java
new file mode 100644
index 0000000000..176eacece0
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/android/desugar/testdata/java8/FunctionWithDefaultMethod.java
@@ -0,0 +1,78 @@
+// 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> {
+  }
+}