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DefaultVertexIdFactory 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.factories;
19  
20  import org.apache.giraph.conf.GiraphConfigurationSettable;
21  import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;
22  import org.apache.giraph.utils.WritableUtils;
23  import org.apache.hadoop.io.WritableComparable;
24  
25  /**
26   * Default {@link VertexIdFactory} that simply uses the default
27   * constructor for the vertex ID class.
28   *
29   * @param <I> Vertex ID
30   */
31  public class DefaultVertexIdFactory<I extends WritableComparable>
32      implements VertexIdFactory<I>, GiraphConfigurationSettable {
33    /** Cached vertex value class. */
34    private Class<I> vertexIdClass;
35    /** Configuration */
36    private ImmutableClassesGiraphConfiguration conf;
37  
38    @Override
39    public void setConf(ImmutableClassesGiraphConfiguration conf) {
40      this.conf = conf;
41      vertexIdClass = conf.getVertexIdClass();
42    }
43  
44    @Override
45    public I newInstance() {
46      return WritableUtils.createWritable(vertexIdClass, conf);
47    }
48  }