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  }