    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
    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  }