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ByteArrayVertexIdEdges 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;
20  
21  import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;
22  import org.apache.giraph.edge.Edge;
23  import org.apache.hadoop.io.Writable;
24  import org.apache.hadoop.io.WritableComparable;
25  
26  import java.io.IOException;
27  
28  /**
29   * Stores vertex id and edge pairs in a single byte array.
30   *
31   * @param <I> Vertex id
32   * @param <E> Edge value
33   */
34  @SuppressWarnings("unchecked")
35  public class ByteArrayVertexIdEdges<I extends WritableComparable,
36      E extends Writable> extends ByteArrayVertexIdData<I, Edge<I,
37      E>> implements VertexIdEdges<I, E> {
38    /**
39     * Cast the {@link ImmutableClassesGiraphConfiguration} so it can be used
40     * to generate edge objects.
41     *
42     * @return Casted configuration
43     */
44    @Override
45    public ImmutableClassesGiraphConfiguration<I, ?, E> getConf() {
46      return (ImmutableClassesGiraphConfiguration<I, ?, E>) super.getConf();
47    }
48  
49    @Override
50    public Edge<I, E> createData() {
51      return getConf().createReusableEdge();
52    }
53  
54    @Override
55    public void writeData(ExtendedDataOutput out, Edge<I, E> edge)
56      throws IOException {
57      WritableUtils.writeEdge(out, edge);
58    }
59  
60    @Override
61    public void readData(ExtendedDataInput in, Edge<I, E> edge)
62      throws IOException {
63      WritableUtils.readEdge(in, edge);
64    }
65  
66    @Override
67    public ByteStructVertexIdEdgeIterator<I, E> getVertexIdEdgeIterator() {
68      return new ByteStructVertexIdEdgeIterator<>(this);
69    }
70  }
71