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DefaultEdgeValueFactory 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.Writable;
24  
25  /**
26   * Factory class to create default edge values.
27   * A user can extend this class in order to customize the creation of new
28   * edge values when an edge is created by the infrastructure.
29   *
30   * @param <E> Edge Value
31   */
32  public class DefaultEdgeValueFactory<E extends Writable>
33      implements EdgeValueFactory<E>, GiraphConfigurationSettable {
34    /** Cached edge value class. */
35    private Class<E> edgeValueClass;
36    /** Configuration */
37    private ImmutableClassesGiraphConfiguration conf;
38  
39    @Override
40    public void setConf(ImmutableClassesGiraphConfiguration conf) {
41      this.conf = conf;
42      edgeValueClass = conf.getEdgeValueClass();
43    }
44  
45    @Override public E newInstance() {
46      return WritableUtils.createWritable(edgeValueClass, conf);
47    }
48  }