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 }