InferLambdaType.java example

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error-prone-master
/*
 * Copyright 2016 Google Inc. 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.errorprone.refaster.testdata.template;

import com.google.errorprone.refaster.annotation.AfterTemplate;
import com.google.errorprone.refaster.annotation.BeforeTemplate;
import java.util.Optional;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class InferLambdaType<T> {
  @BeforeTemplate
  Optional<T> last(Stream<T> stream) {
    return stream.collect(Collectors.reducing((a, b) -> b));
  }

  @AfterTemplate
  Optional<T> reduce(Stream<T> stream) {
    return stream.reduce((T a, T b) -> b);
  }
}