DoubleSumAggregator.java

/*
 * 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.openflamingo.mapreduce.aggregator;


import org.apache.hadoop.io.DoubleWritable;

/**
 * Aggregator for summing up double values.
 */
public class DoubleSumAggregator implements Aggregator<DoubleWritable> {
	/**
	 * Aggregated sum
	 */
	private double sum = 0;

	/**
	 * Aggregate a primitive double.
	 *
	 * @param value Double value to aggregate.
	 */
	public void aggregate(double value) {
		sum += value;
	}

	@Override
	public void aggregate(DoubleWritable value) {
		sum += value.get();
	}

	/**
	 * Set aggregated value using a primitive double.
	 *
	 * @param value Double value to set.
	 */
	public void setAggregatedValue(double value) {
		sum = value;
	}

	@Override
	public void setAggregatedValue(DoubleWritable value) {
		sum = value.get();
	}

	@Override
	public DoubleWritable getAggregatedValue() {
		return new DoubleWritable(sum);
	}

	@Override
	public DoubleWritable createAggregatedValue() {
		return new DoubleWritable();
	}

}