BaseDeserializer.java

/*
 * Copyright (c) 2007-2010 Concurrent, Inc. All Rights Reserved.
 *
 * Project and contact information: http://www.cascading.org/
 *
 * This file is part of the Cascading project.
 *
 * Cascading is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Cascading is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Cascading.  If not, see <http://www.gnu.org/licenses/>.
 */

package cascading.tuple.hadoop;

import java.io.IOException;
import java.io.InputStream;

import cascading.tuple.TupleInputStream;
import org.apache.hadoop.io.serializer.Deserializer;

abstract class BaseDeserializer<T> implements Deserializer<T>
  {
  TupleInputStream inputStream;
  private SerializationElementReader elementReader;

  protected BaseDeserializer( SerializationElementReader elementReader )
    {
    this.elementReader = elementReader;
    }

  public void open( InputStream in )
    {
    if( in instanceof TupleInputStream )
      inputStream = (TupleInputStream) in;
    else
      inputStream = new TupleInputStream( in, elementReader );
    }

  public void close() throws IOException
    {
    try
      {
      if( inputStream != null )
        inputStream.close();
      }
    finally
      {
      inputStream = null;
      }
    }
  }