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.util; 022 023public class TupleComparator extends BaseTupleComparator 024 { 025 static RawComparison BYTE_COMPARISON = new ByteComparison(); 026 027 @Override 028 protected RawComparison getByteComparison() 029 { 030 return BYTE_COMPARISON; 031 } 032 033 static class ByteComparison implements RawComparison 034 { 035 @Override 036 public int compare( byte[] buffer1, int offset1, int length1, byte[] buffer2, int offset2, int length2 ) 037 { 038 if( buffer1 == buffer2 && offset1 == offset2 && length1 == length2 ) 039 return 0; 040 041 int end1 = offset1 + length1; 042 int end2 = offset2 + length2; 043 044 for( int i = offset1, j = offset2; i < end1 && j < end2; i++, j++ ) 045 { 046 int a = ( buffer1[ i ] & 0xff ); 047 int b = ( buffer2[ j ] & 0xff ); 048 049 if( a != b ) 050 return a - b; 051 } 052 053 return length1 - length2; 054 } 055 } 056 }