/*

  * 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 com.google.common.base.MoreObjects;

 import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;

 import org.apache.giraph.utils.WritableUtils;

 import org.apache.hadoop.io.Writable;

 /**

  * Factory class to create default message values.

  *

  * @param <M> Message Value

  */

 public class DefaultMessageValueFactory<M extends Writable>

     implements MessageValueFactory<M> {

   /** Message value class */

   private final Class<M> messageValueClass;

   /** Configuration */

   private final ImmutableClassesGiraphConfiguration conf;

   /**

    * Constructor

    * @param messageValueClass message value class

    * @param conf configuration

    */

   public DefaultMessageValueFactory(Class<M> messageValueClass,

       ImmutableClassesGiraphConfiguration conf) {

     this.messageValueClass = messageValueClass;

     this.conf = conf;

   }

   @Override public M newInstance() {

     return WritableUtils.createWritable(messageValueClass, conf);

   }

   @Override public String toString() {

     return MoreObjects.toStringHelper(this)

         .add("messageValueClass", messageValueClass)

         .toString();

   }

 }