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 19 package org.apache.giraph.edge; 20 21 import org.apache.giraph.conf.GiraphConstants; 22 import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration; 23 import org.apache.hadoop.io.Writable; 24 25 /** 26 * Default implementation of vertex creation decision maker. 27 * By default you can either create all vertices or not create 28 * implicit vertices at all. 29 * 30 * @param <I> Vertex id 31 */ 32 public class DefaultCreateSourceVertexCallback<I extends Writable> 33 implements CreateSourceVertexCallback<I> { 34 /** 35 * True if giraph has to create even vertices that only exist 36 * in edge input 37 */ 38 private boolean shouldCreateVertices; 39 40 @Override 41 public boolean shouldCreateSourceVertex(I vertexId) { 42 return shouldCreateVertices; 43 } 44 45 @Override 46 public void setConf(ImmutableClassesGiraphConfiguration configuration) { 47 shouldCreateVertices = 48 GiraphConstants.CREATE_EDGE_SOURCE_VERTICES.get(configuration); 49 } 50 }