    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 cascading.tuple.hadoop.TupleSerialization;
    024import cascading.tuple.io.KeyIndexTuple;
    025
    026public class KeyIndexTupleDeserializer extends IndexTupleDeserializer<KeyIndexTuple>
    027  {
    028  public KeyIndexTupleDeserializer( TupleSerialization.SerializationElementReader elementReader )
    029    {
    030    super( elementReader );
    031
    032    typeMap = elementReader.getTupleSerialization().getKeyTypeMap();
    033
    034    if( elementReader.getTupleSerialization().areTypesRequired() )
    035      {
    036      if( typeMap == null || typeMap.isEmpty() )
    037        throw new IllegalStateException( "types are required to perform serialization, fields: " + elementReader.getTupleSerialization().getKeyFieldsMap() );
    038      }
    039    }
    040
    041  @Override
    042  protected KeyIndexTuple createTuple()
    043    {
    044    return new KeyIndexTuple();
    045    }
    046
    047  @Override
    048  protected Class[] getTypesFor( int ordinal )
    049    {
    050    return typeMap.get( ordinal );
    051    }
    052  }