/*
    * 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 org.apache.giraph.conf.GiraphConfigurationSettable;
  import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;
  import org.apache.giraph.edge.OutEdges;
  import org.apache.giraph.utils.ReflectionUtils;
  import org.apache.hadoop.io.Writable;
  import org.apache.hadoop.io.WritableComparable;
  
  /**
   * Default factory class for creating {@link OutEdges} instances to be used
   * during input. This factory simply creates an instance of the
   * {@link OutEdges} class set in the configuration.
   *
   * @param <I> Vertex ID type.
   * @param <E> Edge value type.
   */
  public class DefaultInputOutEdgesFactory<I extends WritableComparable,
    E extends Writable> implements OutEdgesFactory<I, E>,
    GiraphConfigurationSettable {
    /** Configuration */
    private ImmutableClassesGiraphConfiguration<I, ?, E> conf;
  
    @Override
    public void setConf(ImmutableClassesGiraphConfiguration conf) {
      this.conf = conf;
    }
  
    @Override
    public OutEdges<I, E> newInstance() {
      return ReflectionUtils.newInstance(conf.getInputOutEdgesClass(), conf);
    }
  }