    001/*
    002 * Copyright (c) 2007-2017 Xplenty, 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;
    024import java.util.Map;
    025
    026import cascading.tuple.Tuple;
    027import cascading.tuple.hadoop.TupleSerialization;
    028import cascading.tuple.io.IndexTuple;
    029
    030public class IndexTupleDeserializer<T extends IndexTuple> extends BaseDeserializer<T>
    031  {
    032  protected Map<Integer, Class[]> typeMap;
    033
    034  public IndexTupleDeserializer( TupleSerialization.SerializationElementReader elementReader )
    035    {
    036    super( elementReader );
    037    }
    038
    039  public T deserialize( IndexTuple tuple ) throws IOException
    040    {
    041    if( tuple == null )
    042      tuple = createTuple();
    043
    044    int ordinal = inputStream.readVInt();
    045    tuple.setIndex( ordinal );
    046
    047    Class[] types = getTypesFor( ordinal );
    048
    049    // in both cases, we need to fill a new Tuple instance
    050    if( types == null )
    051      tuple.setTuple( inputStream.readUnTyped( new Tuple() ) );
    052    else
    053      tuple.setTuple( inputStream.readTyped( types, new Tuple() ) );
    054
    055    return (T) tuple;
    056    }
    057
    058  @Override
    059  protected T createTuple()
    060    {
    061    return (T) new IndexTuple();
    062    }
    063
    064  protected Class[] getTypesFor( int ordinal )
    065    {
    066    return null;
    067    }
    068  }