/*

  * 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 static org.apache.giraph.conf.GiraphConstants.EDGE_VALUE_FACTORY_CLASS;

 import static org.apache.giraph.conf.GiraphConstants.VERTEX_ID_FACTORY_CLASS;

 import static org.apache.giraph.conf.GiraphConstants.VERTEX_VALUE_FACTORY_CLASS;

 import org.apache.hadoop.conf.Configuration;

 import org.apache.hadoop.io.Writable;

 import org.apache.hadoop.io.WritableComparable;

 /**

  * Holder for factories to create user types.

  *

  * Note that we don't store the {@link MessageValueFactory} here because they

  * reference types which may change at a given superstep. Instead we create them

  * as necessary so that they get the latest information.

  *

  * @param <I> Vertex id

  * @param <V> Vertex data

  * @param <E> Edge data

  */

 public class ValueFactories<I extends WritableComparable,

     V extends Writable, E extends Writable> {

   /** Vertex ID factory. */

   private final VertexIdFactory<I> vertexIdFactory;

   /** Vertex value factory. */

   private final VertexValueFactory<V> vertexValueFactory;

   /** Edge value factory. */

   private final EdgeValueFactory<E> edgeValueFactory;

   /**

    * Constructor reading from Configuration

    *

    * @param conf Configuration to read from

    */

   public ValueFactories(Configuration conf) {

     vertexIdFactory = VERTEX_ID_FACTORY_CLASS.newInstance(conf);

     vertexValueFactory = VERTEX_VALUE_FACTORY_CLASS.newInstance(conf);

     edgeValueFactory = EDGE_VALUE_FACTORY_CLASS.newInstance(conf);

   }

   public EdgeValueFactory<E> getEdgeValueFactory() {

     return edgeValueFactory;

   }

   public VertexIdFactory<I> getVertexIdFactory() {

     return vertexIdFactory;

   }

   public VertexValueFactory<V> getVertexValueFactory() {

     return vertexValueFactory;

   }

 }