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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.mapping;
20  
21  import org.apache.hadoop.io.LongWritable;
22  
23  /**
24   * MappingStoreOps implementation which reads partition information from map
25   */
26  @SuppressWarnings("unchecked, rawtypes")
27  public class DefaultLongByteOps extends AbstractLongByteOps {
28  
29    /**
30     * Default constructor (do not use)
31     */
32    public DefaultLongByteOps() {
33    }
34  
35    @Override
36    public boolean hasEmbedding() {
37      return false;
38    }
39  
40    @Override
41    public void embedTargetInfo(LongWritable id) {
42      throw new UnsupportedOperationException();
43    }
44  
45    @Override
46    public void removeTargetInfo(LongWritable id) {
47      throw new UnsupportedOperationException();
48    }
49  
50    @Override
51    public int getPartition(LongWritable id, int partitionCount,
52      int workerCount) {
53      byte target = mappingStore.getByteTarget(id);
54      return computePartition(id, partitionCount, workerCount, target);
55    }
56  }
57