| /* |
| * 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.examples; |
| |
| import org.apache.hadoop.io.LongWritable; |
| |
| import org.apache.giraph.graph.Aggregator; |
| |
| /** |
| * Aggregator for summing up values. |
| */ |
| public class LongSumAggregator implements Aggregator<LongWritable> { |
| /** Internal sum */ |
| private long sum = 0; |
| |
| public void aggregate(long value) { |
| sum += value; |
| } |
| |
| @Override |
| public void aggregate(LongWritable value) { |
| sum += value.get(); |
| } |
| |
| @Override |
| public void setAggregatedValue(LongWritable value) { |
| sum = value.get(); |
| } |
| |
| @Override |
| public LongWritable getAggregatedValue() { |
| return new LongWritable(sum); |
| } |
| |
| @Override |
| public LongWritable createAggregatedValue() { |
| return new LongWritable(); |
| } |
| } |