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.util; 022 023import java.io.IOException; 024 025import cascading.CascadingException; 026import cascading.tuple.io.IndexTuple; 027import org.apache.hadoop.conf.Configurable; 028 029public class IndexTupleCoGroupingComparator extends DeserializerComparator<IndexTuple> implements Configurable 030 { 031 public int compare( byte[] b1, int s1, int l1, byte[] b2, int s2, int l2 ) 032 { 033 try 034 { 035 lhsBuffer.reset( b1, s1, l1 ); 036 rhsBuffer.reset( b2, s2, l2 ); 037 038 int lhsIndex = lhsStream.readVInt(); 039 int rhsIndex = rhsStream.readVInt(); 040 041 int c = compareTuples( keyTypes, groupComparators ); 042 043 if( c != 0 ) 044 return c; 045 046 return rhsIndex - lhsIndex; 047 } 048 catch( IOException exception ) 049 { 050 throw new CascadingException( exception ); 051 } 052 finally 053 { 054 lhsBuffer.clear(); 055 rhsBuffer.clear(); 056 } 057 } 058 059 public int compare( IndexTuple lhs, IndexTuple rhs ) 060 { 061 int c = compareTuples( groupComparators, lhs.getTuple(), rhs.getTuple() ); 062 063 if( c != 0 ) 064 return c; 065 066 // intentionally sort in reverse 067 return rhs.getIndex() - lhs.getIndex(); 068 } 069 }