/*

  * 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.io.internal;

 import org.apache.giraph.io.MappingInputFormat;

 import org.apache.giraph.io.MappingReader;

 import org.apache.giraph.job.HadoopUtils;

 import org.apache.hadoop.conf.Configuration;

 import org.apache.hadoop.io.Writable;

 import org.apache.hadoop.io.WritableComparable;

 import org.apache.hadoop.mapreduce.InputSplit;

 import org.apache.hadoop.mapreduce.JobContext;

 import org.apache.hadoop.mapreduce.TaskAttemptContext;

 import java.io.DataInput;

 import java.io.DataOutput;

 import java.io.IOException;

 import java.util.List;

 /**

  * For internal use only.

  *

  * Wraps user set {@link org.apache.giraph.io.VertexInputFormat} to make

  * sure proper configuration parameters are passed around, that user can set

  * parameters in configuration and they will be available in other methods

  * related to this format.

  *

  * @param <I> vertexId type

  * @param <V> vertexValue type

  * @param <E> edgeValue type

  * @param <B> mappingTarget type

  */

 public class WrappedMappingInputFormat<I extends WritableComparable,

   V extends Writable, E extends Writable, B extends Writable>

   extends MappingInputFormat<I, V, E, B> {

   /** originalInputFormat to wrap over */

   private MappingInputFormat<I, V, E, B> originalInputFormat;

   /**

    * Constructor

    *

    * @param mappingInputFormat original mappingInputFormat

    */

   public WrappedMappingInputFormat(

       MappingInputFormat<I, V, E, B> mappingInputFormat) {

     originalInputFormat = mappingInputFormat;

   }

   @Override

   public void checkInputSpecs(Configuration conf) {

     originalInputFormat.checkInputSpecs(conf);

   }

   @Override

   public List<InputSplit> getSplits(JobContext context, int minSplitCountHint)

     throws IOException, InterruptedException {

     return originalInputFormat.getSplits(

         HadoopUtils.makeJobContext(getConf(), context),

         minSplitCountHint);

   }

   @Override

   public MappingReader<I, V, E, B> createMappingReader(InputSplit split,

     TaskAttemptContext context) throws IOException {

     final MappingReader<I, V, E, B> mappingReader = originalInputFormat

         .createMappingReader(split,

             HadoopUtils.makeTaskAttemptContext(getConf(), context));

     return new WrappedMappingReader<>(mappingReader, getConf());

   }

   @Override

   public void writeInputSplit(InputSplit inputSplit,

     DataOutput dataOutput) throws IOException {

     originalInputFormat.writeInputSplit(inputSplit, dataOutput);

   }

   @Override

   public InputSplit readInputSplit(

     DataInput dataInput) throws IOException, ClassNotFoundException {

     return originalInputFormat.readInputSplit(dataInput);

   }

 }