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DefaultOutEdgesFactory 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.edge.OutEdges;
23  import org.apache.giraph.utils.ReflectionUtils;
24  import org.apache.hadoop.io.Writable;
25  import org.apache.hadoop.io.WritableComparable;
26  
27  /**
28   * Default factory class for creating {@link OutEdges} instances to be used
29   * during computation. This factory simply creates an instance of the
30   * {@link OutEdges} class set in the configuration.
31   *
32   * @param <I> Vertex ID type.
33   * @param <E> Edge value type.
34   */
35  public class DefaultOutEdgesFactory<I extends WritableComparable,
36    E extends Writable> implements OutEdgesFactory<I, E>,
37    GiraphConfigurationSettable {
38    /** Configuration */
39    private ImmutableClassesGiraphConfiguration<I, ?, E> conf;
40  
41    @Override
42    public void setConf(ImmutableClassesGiraphConfiguration conf) {
43      this.conf = conf;
44    }
45  
46    @Override
47    public OutEdges<I, E> newInstance() {
48      return ReflectionUtils.newInstance(conf.getOutEdgesClass(), conf);
49    }
50  }