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DefaultCreateSourceVertexCallback 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.edge;
20  
21  import org.apache.giraph.conf.GiraphConstants;
22  import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;
23  import org.apache.hadoop.io.Writable;
24  
25  /**
26   * Default implementation of vertex creation decision maker.
27   * By default you can either create all vertices or not create
28   * implicit vertices at all.
29   *
30   * @param <I> Vertex id
31   */
32  public class DefaultCreateSourceVertexCallback<I extends Writable>
33      implements CreateSourceVertexCallback<I> {
34    /**
35     * True if giraph has to create even vertices that only exist
36     * in edge input
37     */
38    private boolean shouldCreateVertices;
39  
40    @Override
41    public boolean shouldCreateSourceVertex(I vertexId) {
42      return shouldCreateVertices;
43    }
44  
45    @Override
46    public void setConf(ImmutableClassesGiraphConfiguration configuration) {
47      shouldCreateVertices =
48          GiraphConstants.CREATE_EDGE_SOURCE_VERTICES.get(configuration);
49    }
50  }