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 }