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  }