/*
    * 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.giraph.block_app.framework.piece.global_comm;
  
  import org.apache.hadoop.io.DoubleWritable;
  import org.apache.hadoop.io.FloatWritable;
  import org.apache.hadoop.io.IntWritable;
  import org.apache.hadoop.io.LongWritable;
  
  /**
   * Utility object with common primitive reduce operations,
   * without need to create reusable objects within the piece.
   */
  public class ReduceUtilsObject {
    private final DoubleWritable reusableDouble = new DoubleWritable();
    private final FloatWritable reusableFloat = new FloatWritable();
    private final LongWritable reusableLong = new LongWritable();
    private final IntWritable reusableInt = new IntWritable();
  
    // utility functions:
    public void reduceDouble(
        ReducerHandle<DoubleWritable, ?> reduceHandle, double value) {
      DoubleWritable tmp = reusableDouble;
      tmp.set(value);
      reduceHandle.reduce(tmp);
    }
  
    public void reduceFloat(
        ReducerHandle<FloatWritable, ?> reduceHandle, float value) {
      FloatWritable tmp = reusableFloat;
      tmp.set(value);
      reduceHandle.reduce(tmp);
    }
  
    public void reduceLong(
        ReducerHandle<LongWritable, ?> reduceHandle, long value) {
      LongWritable tmp = reusableLong;
      tmp.set(value);
      reduceHandle.reduce(tmp);
    }
  
    public void reduceInt(ReducerHandle<IntWritable, ?> reduceHandle, int value) {
      IntWritable tmp = reusableInt;
      tmp.set(value);
      reduceHandle.reduce(tmp);
    }
  }