    001/*
    002 * Copyright (c) 2007-2016 Concurrent, Inc. All Rights Reserved.
    003 *
    004 * Project and contact information: http://www.cascading.org/
    005 *
    006 * This file is part of the Cascading project.
    007 *
    008 * Licensed under the Apache License, Version 2.0 (the "License");
    009 * you may not use this file except in compliance with the License.
    010 * You may obtain a copy of the License at
    011 *
    012 *     http://www.apache.org/licenses/LICENSE-2.0
    013 *
    014 * Unless required by applicable law or agreed to in writing, software
    015 * distributed under the License is distributed on an "AS IS" BASIS,
    016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    017 * See the License for the specific language governing permissions and
    018 * limitations under the License.
    019 */
    020
    021package cascading.tuple.hadoop.io;
    022
    023import java.io.IOException;
    024
    025import cascading.tuple.hadoop.TupleSerialization;
    026import cascading.tuple.io.TupleOutputStream;
    027import cascading.tuple.io.TuplePair;
    028
    029public class TuplePairSerializer extends BaseSerializer<TuplePair>
    030  {
    031  private final TupleOutputStream.TupleElementWriter[] keyWriters;
    032  private final TupleOutputStream.TupleElementWriter[] sortWriters;
    033
    034  public TuplePairSerializer( TupleSerialization.SerializationElementWriter elementWriter )
    035    {
    036    super( elementWriter );
    037
    038    Class[] keyClasses = elementWriter.getTupleSerialization().getKeyTypes();
    039    Class[] sortClasses = elementWriter.getTupleSerialization().getSortTypes();
    040
    041    if( elementWriter.getTupleSerialization().areTypesRequired() )
    042      {
    043      if( keyClasses == null )
    044        throw new IllegalStateException( "types are required to perform serialization, grouping declared fields: " + elementWriter.getTupleSerialization().getKeyFields() );
    045
    046      if( sortClasses == null )
    047        throw new IllegalStateException( "types are required to perform serialization, sorting declared fields: " + elementWriter.getTupleSerialization().getSortFields() );
    048      }
    049
    050    keyWriters = HadoopTupleOutputStream.getWritersFor( elementWriter, keyClasses );
    051    sortWriters = HadoopTupleOutputStream.getWritersFor( elementWriter, sortClasses );
    052    }
    053
    054  public void serialize( TuplePair tuple ) throws IOException
    055    {
    056    if( keyWriters == null )
    057      outputStream.writeUnTyped( tuple.getLhs() );
    058    else
    059      outputStream.writeWith( keyWriters, tuple.getLhs() );
    060
    061    if( sortWriters == null )
    062      outputStream.writeUnTyped( tuple.getRhs() );
    063    else
    064      outputStream.writeWith( sortWriters, tuple.getRhs() );
    065    }
    066  }