1/*2 * Licensed to the Apache Software Foundation (ASF) under one3 * or more contributor license agreements. See the NOTICE file4 * distributed with this work for additional information5 * regarding copyright ownership. The ASF licenses this file6 * to you under the Apache License, Version 2.0 (the7 * "License"); you may not use this file except in compliance8 * with the License. You may obtain a copy of the License at9 *10 * http://www.apache.org/licenses/LICENSE-2.011 *12 * Unless required by applicable law or agreed to in writing, software13 * distributed under the License is distributed on an "AS IS" BASIS,14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.15 * See the License for the specific language governing permissions and16 * limitations under the License.17 */1819package org.apache.giraph.reducers.impl;
2021import java.io.DataInput;
22import java.io.DataOutput;
23import java.io.IOException;
24import org.apache.giraph.reducers.ReduceSameTypeOperation;
25import org.apache.hadoop.io.LongWritable;
2627/**28 * ReduceOperation that XORs (^) values together.29 */30publicclassLongXorReduceextends ReduceSameTypeOperation<LongWritable> {
31/**32 * Long XOR, equivalent to l1 ^ l233 */34publicstaticfinalLongXorReduce INSTANCE = newLongXorReduce();
3536/** Constructor used for deserialization only */37publicLongXorReduce() {
38 }
3940 @Override public LongWritable createInitialValue() {
41returnnew LongWritable(0L);
42 }
4344 @Override public LongWritable reduce(LongWritable curValue,
45 LongWritable valueToReduce) {
46 curValue.set(curValue.get() ^ valueToReduce.get());
47return curValue;
48 }
4950 @Override publicvoid write(DataOutput out) throws IOException {
51 }
5253 @Override publicvoid readFields(DataInput in) throws IOException {
54 }
55 }