/*

  * 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.edge;

 import org.apache.giraph.conf.GiraphConstants;

 import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;

 import org.apache.hadoop.io.Writable;

 /**

  * Default implementation of vertex creation decision maker.

  * By default you can either create all vertices or not create

  * implicit vertices at all.

  *

  * @param <I> Vertex id

  */

 public class DefaultCreateSourceVertexCallback<I extends Writable>

     implements CreateSourceVertexCallback<I> {

   /**

    * True if giraph has to create even vertices that only exist

    * in edge input

    */

   private boolean shouldCreateVertices;

   @Override

   public boolean shouldCreateSourceVertex(I vertexId) {

     return shouldCreateVertices;

   }

   @Override

   public void setConf(ImmutableClassesGiraphConfiguration configuration) {

     shouldCreateVertices =

         GiraphConstants.CREATE_EDGE_SOURCE_VERTICES.get(configuration);

   }

 }