/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache License, Version 2.0 (the

  * "License"); you may not use this file except in compliance

  * with the License.  You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.apache.giraph.factories;

 import org.apache.giraph.conf.GiraphConfigurationSettable;

 import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;

 import org.apache.giraph.utils.WritableUtils;

 import org.apache.hadoop.io.Writable;

 /**

  * Factory class to create default edge values.

  * A user can extend this class in order to customize the creation of new

  * edge values when an edge is created by the infrastructure.

  *

  * @param <E> Edge Value

  */

 public class DefaultEdgeValueFactory<E extends Writable>

     implements EdgeValueFactory<E>, GiraphConfigurationSettable {

   /** Cached edge value class. */

   private Class<E> edgeValueClass;

   /** Configuration */

   private ImmutableClassesGiraphConfiguration conf;

   @Override

   public void setConf(ImmutableClassesGiraphConfiguration conf) {

     this.conf = conf;

     edgeValueClass = conf.getEdgeValueClass();

   }

   @Override public E newInstance() {

     return WritableUtils.createWritable(edgeValueClass, conf);

   }

 }