/*

  * 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.utils.io;

 import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;

 import org.apache.giraph.utils.ExtendedDataInput;

 import org.apache.giraph.utils.ExtendedDataOutput;

 import org.apache.giraph.utils.WritableUtils;

 import java.io.DataInput;

 import java.io.DataOutput;

 import java.io.IOException;

 /**

  * Wraps {@link ExtendedDataOutput} and {@link ExtendedDataOutput} to be able

  * to write data and later read data from the same place

  */

 public class ExtendedDataInputOutput extends DataInputOutput {

   /** Configuration */

   private final ImmutableClassesGiraphConfiguration conf;

   /** DataOutput which we write to */

   private ExtendedDataOutput dataOutput;

   /**

    * Constructor

    *

    * @param conf Configuration

    */

   public ExtendedDataInputOutput(ImmutableClassesGiraphConfiguration conf) {

     this.conf = conf;

     dataOutput = conf.createExtendedDataOutput();

   }

   @Override

   public DataOutput getDataOutput() {

     return dataOutput;

   }

   @Override

   public ExtendedDataInput createDataInput() {

     return conf.createExtendedDataInput(dataOutput.getByteArray(), 0,

         dataOutput.getPos());

   }

   @Override

   public void write(DataOutput out) throws IOException {

     WritableUtils.writeExtendedDataOutput(dataOutput, out);

   }

   @Override

   public void readFields(DataInput in) throws IOException {

     dataOutput = WritableUtils.readExtendedDataOutput(in, conf);

   }

 }