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Small2GraphInit 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  package org.apache.giraph.block_app.test_setup.graphs;
19  
20  import org.apache.giraph.block_app.test_setup.NumericTestGraph;
21  import org.apache.giraph.block_app.test_setup.TestGraphModifier;
22  import org.apache.giraph.function.Supplier;
23  import org.apache.hadoop.io.Writable;
24  import org.apache.hadoop.io.WritableComparable;
25  
26  
27  /**
28   * Create a network that looks like:
29   *   1      5
30   *  / \    / \    6
31   * 0---2  3---4
32   *
33   * where 6 is disconnected from the rest of the network.
34   *
35   * @param <I> Vertex id type
36   * @param <V> Vertex value type
37   * @param <E> Edge value type
38   */
39  public class Small2GraphInit<I extends WritableComparable,
40      V extends Writable, E extends Writable>
41      implements TestGraphModifier<I, V, E> {
42    private final Supplier<E> edgeSupplier;
43  
44    public Small2GraphInit() {
45      this(null);
46    }
47  
48    public Small2GraphInit(Supplier<E> edgeSupplier) {
49      this.edgeSupplier = edgeSupplier;
50    }
51  
52    @Override
53    public void modifyGraph(NumericTestGraph<I, V, E> graph) {
54      graph.addSymmetricEdge(0, 1, createEdgeValue());
55      graph.addSymmetricEdge(0, 2, createEdgeValue());
56      graph.addSymmetricEdge(1, 2, createEdgeValue());
57      graph.addSymmetricEdge(3, 4, createEdgeValue());
58      graph.addSymmetricEdge(3, 5, createEdgeValue());
59      graph.addSymmetricEdge(4, 5, createEdgeValue());
60  
61      graph.addVertex(6);
62    }
63  
64    private E createEdgeValue() {
65      return edgeSupplier != null ? edgeSupplier.get() : null;
66    }
67  }
68