content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.beam.sdk.extensions.euphoria.core.client.util;
  
  import org.apache.beam.sdk.extensions.euphoria.core.annotation.audience.Audience;
  import org.apache.beam.sdk.extensions.euphoria.core.client.functional.BinaryFunction;
  import org.apache.beam.sdk.extensions.euphoria.core.client.operator.ReduceByKey;
  import org.apache.beam.sdk.values.TypeDescriptor;
  import org.apache.beam.sdk.values.TypeDescriptors;
  
  /**
   * Provides commonly used function objects around computing sums.
   *
   * @deprecated Use Java SDK directly, Euphoria is scheduled for removal in a future release.
   */
  @Audience(Audience.Type.CLIENT)
  @Deprecated
  public class Sums {
  
    private static class SumFunction<T> implements ReduceByKey.CombineFunctionWithIdentity<T> {
  
      private final T identity;
      private final TypeDescriptor<T> valueDesc;
      private final BinaryFunction<T, T, T> reduce;
  
      SumFunction(T identity, TypeDescriptor<T> valueDesc, BinaryFunction<T, T, T> reduce) {
        this.identity = identity;
        this.valueDesc = valueDesc;
        this.reduce = reduce;
      }
  
      @Override
      public T identity() {
        return identity;
      }
  
      @Override
      public TypeDescriptor<T> valueDesc() {
        return valueDesc;
      }
  
      @Override
      public T apply(T left, T right) {
        return reduce.apply(left, right);
      }
    }
  
    private static final SumFunction<Long> SUMS_OF_LONG =
        new SumFunction<>(0L, TypeDescriptors.longs(), (a, b) -> a + b);
    private static final SumFunction<Integer> SUMS_OF_INT =
        new SumFunction<>(0, TypeDescriptors.integers(), (a, b) -> a + b);
    private static final SumFunction<Float> SUMS_OF_FLOAT =
        new SumFunction<>(0.0f, TypeDescriptors.floats(), (a, b) -> a + b);
    private static final SumFunction<Double> SUMS_OF_DOUBLE =
        new SumFunction<>(0.0, TypeDescriptors.doubles(), (a, b) -> a + b);
  
    private Sums() {}
  
    public static ReduceByKey.CombineFunctionWithIdentity<Long> ofLongs() {
      return SUMS_OF_LONG;
    }
  
    public static ReduceByKey.CombineFunctionWithIdentity<Integer> ofInts() {
      return SUMS_OF_INT;
    }
  
    public static ReduceByKey.CombineFunctionWithIdentity<Float> ofFloats() {
      return SUMS_OF_FLOAT;
    }
  
    public static ReduceByKey.CombineFunctionWithIdentity<Double> ofDoubles() {
      return SUMS_OF_DOUBLE;
    }
  }
  