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ByteStructVertexIdEdgeIterator 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.edge.Edge;
22  import org.apache.hadoop.io.Writable;
23  import org.apache.hadoop.io.WritableComparable;
24  
25  /**
26   * Special iterator that reuses vertex ids and edge objects so that the
27   * lifetime of the object is only until next() is called.
28   *
29   * @param <I> vertexId type parameter
30   * @param <E> edge type parameter
31   */
32  public class ByteStructVertexIdEdgeIterator<I extends WritableComparable,
33    E extends Writable> extends ByteStructVertexIdDataIterator<I, Edge<I, E>>
34    implements VertexIdEdgeIterator<I, E> {
35  
36    /**
37     * Constructor
38     *
39     * @param vertexIdData vertexIdData
40     */
41    public ByteStructVertexIdEdgeIterator(
42        AbstractVertexIdData<I, Edge<I, E>> vertexIdData) {
43      super(vertexIdData);
44    }
45  
46    @Override
47    public Edge<I, E> getCurrentEdge() {
48      return getCurrentData();
49    }
50  
51  
52    @Override
53    public Edge<I, E> releaseCurrentEdge() {
54      return releaseCurrentData();
55    }
56  }