1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * 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 and 16 * limitations under the License. 17 */ 18 19 package org.apache.giraph.utils.hashing; 20 21 import com.google.common.hash.Funnel; 22 import com.google.common.hash.PrimitiveSink; 23 import org.apache.hadoop.io.LongWritable; 24 25 /** 26 * Hashing strategy for LongWritable. Implemented via an enum per advice 27 * in Funnel. 28 * 29 * @see Funnel 30 */ 31 public enum LongWritableFunnel implements Funnel<LongWritable> { 32 /** singleton */ 33 INSTANCE; 34 35 @Override public void funnel(LongWritable w, PrimitiveSink into) { 36 into.putLong(w.get()); 37 } 38 }