    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
    023import java.io.IOException;
    024import java.util.Comparator;
    025
    026import cascading.CascadingException;
    027import cascading.tuple.io.TuplePair;
    028import org.apache.hadoop.conf.Configuration;
    029
    030/** Class TuplePairComparator is an implementation of {@link org.apache.hadoop.io.RawComparator}. */
    031public class GroupingSortingComparator extends DeserializerComparator<TuplePair>
    032  {
    033  Class[] sortTypes;
    034  Comparator[] sortComparators;
    035
    036  @Override
    037  public void setConf( Configuration conf )
    038    {
    039    super.setConf( conf );
    040
    041    if( conf == null )
    042      return;
    043
    044    sortTypes = tupleSerialization.getSortTypes();
    045
    046    sortComparators = deserializeComparatorsFor( "cascading.sort.comparator" );
    047    sortComparators = delegatingComparatorsFor( sortTypes, sortComparators );
    048    }
    049
    050  public int compare( byte[] b1, int s1, int l1, byte[] b2, int s2, int l2 )
    051    {
    052    try
    053      {
    054      lhsBuffer.reset( b1, s1, l1 );
    055      rhsBuffer.reset( b2, s2, l2 );
    056
    057      int c = compareTuples( keyTypes, groupComparators );
    058
    059      if( c != 0 )
    060        return c;
    061
    062      return compareTuples( sortTypes, sortComparators );
    063      }
    064    catch( IOException exception )
    065      {
    066      throw new CascadingException( exception );
    067      }
    068    finally
    069      {
    070      lhsBuffer.clear();
    071      rhsBuffer.clear();
    072      }
    073    }
    074
    075  public int compare( TuplePair lhs, TuplePair rhs )
    076    {
    077    int c = compareTuples( groupComparators, lhs.getLhs(), rhs.getLhs() );
    078
    079    if( c != 0 )
    080      return c;
    081
    082    return compareTuples( sortComparators, lhs.getRhs(), rhs.getRhs() );
    083    }
    084  }