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LongWritableFunnel xref
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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  }