my ( $filename, $object_xref_id, $mapped ) = @_;

  ######################################################################
  # Dump for 'object_xref'.                                            #
  ######################################################################

  my $fh = IO::File->new( '>' . $filename )
    or croak( sprintf( "Can not open '%s' for writing", $filename ) );

  log_progress( "Dumping for 'object_xref' to '%s'\n", $filename );

  foreach my $xref ( values( %{$mapped} ) ) {
    foreach my $object_xref ( @{ $xref->{'mapped_to'} } ) {
      # Assign 'object_xref_id' to this Object Xref.
      $object_xref->{'object_xref_id'} = ++$object_xref_id;

      $fh->printf( "%d\t%d\t%s\t%d\t%s\n",
                   $object_xref->{'object_xref_id'},
                   $object_xref->{'ensembl_id'},
                   $object_xref->{'ensembl_object_type'},
                   $xref->{'xref_id'},
                   '\N' );
    }
  }
  $fh->close();

  log_progress("Dumping for 'object_xref' done\n");

} ## end sub dump_objexref

#-----------------------------------------------------------------------

  my ( $filename, $unmapped_object_id, $analysis_id, $unmapped ) = @_;

  ######################################################################
  # Dump for 'unmapped_object'.                                        #
  ######################################################################

  my $fh = IO::File->new( '>' . $filename )
    or croak( sprintf( "Can not open '%s' for writing", $filename ) );

  log_progress( "Dumping for 'unmapped_object' to '%s'\n", $filename );

  foreach my $xref ( values( %{$unmapped} ) ) {
    # Assign 'unmapped_object_id' to this Xref.
    $xref->{'unmapped_object_id'} = ++$unmapped_object_id;

    $fh->printf(
      "%d\t%s\t%s\t%d\t%s\t%d\t%s\t%s\t%s\t%s\t%s\n",
      $xref->{'unmapped_object_id'},
      'xref',
      $analysis_id || '\N',    # '\N' (NULL) means no analysis exists
                               # and uploading this table will fail.
      $xref->{'external_db_id'},
      $xref->{'accession'},
      $xref->{'reason'}->{'unmapped_reason_id'}, (
        defined( $xref->{'score'} )
        ? sprintf( "%.3f", $xref->{'score'} )
        : '\N'
      ),
      '\N',
      $xref->{'ensembl_id'} || '\N',
      ( defined( $xref->{'ensembl_id'} ) ? 'Transcript' : '\N' ),
      '\N' );
  }
  $fh->close();

  log_progress("Dumping for 'unmapped_object' done\n");

} ## end sub dump_unmapped_object

#-----------------------------------------------------------------------

  my ( $filename, $unmapped_reason_id, $unmapped ) = @_;

  ######################################################################
  # Dump for 'unmapped_reason'.                                        #
  ######################################################################

  # Create a list of the unique reasons.
  my %reasons;

  foreach my $xref ( values( %{$unmapped} ) ) {
    if ( !exists( $reasons{ $xref->{'reason_full'} } ) ) {
      $reasons{ $xref->{'reason_full'} } = {
                                        'summary' => $xref->{'reason'},
                                        'full' => $xref->{'reason_full'}
      };
    }
  }

  my $fh = IO::File->new( '>' . $filename )
    or croak( sprintf( "Can not open '%s' for writing", $filename ) );

  log_progress( "Dumping for 'unmapped_reason' to '%s'\n", $filename );

  foreach my $reason (
            sort( { $a->{'full'} cmp $b->{'full'} } values(%reasons) ) )
  {
    # Assign 'unmapped_reason_id' to this reason.
    $reason->{'unmapped_reason_id'} = ++$unmapped_reason_id;

    $fh->printf( "%d\t%s\t%s\n", $reason->{'unmapped_reason_id'},
                 $reason->{'summary'}, $reason->{'full'} );

  }
  $fh->close();

  log_progress("Dumping for 'unmapped_reason' done\n");

  # Assign reasons to the unmapped Xrefs from %reasons.
  foreach my $xref ( values( %{$unmapped} ) ) {
    $xref->{'reason'}      = $reasons{ $xref->{'reason_full'} };
    $xref->{'reason_full'} = undef;
  }

} ## end sub dump_unmapped_reason

#-----------------------------------------------------------------------

  my ( $filename, $xref_id, $mapped, $unmapped ) = @_;

  ######################################################################
  # Dump for 'xref'.                                                   #
  ######################################################################

  my $fh = IO::File->new( '>' . $filename )
    or croak( sprintf( "Can not open '%s' for writing", $filename ) );

  log_progress( "Dumping for 'xref' to '%s'\n", $filename );

  foreach my $xref ( values( %{$unmapped} ), values( %{$mapped} ) ) {
    # Assign 'xref_id' to this Xref.
    $xref->{'xref_id'} = ++$xref_id;

    my $accession = $xref->{'accession'};

    my ($version) = ( $accession =~ /\.(\d+)$/ );
    $version ||= 0;

    $fh->printf("%d\t%d\t%s\t%s\t%d\t%s\t%s\t%s\n",
                $xref->{'xref_id'},
                $xref->{'external_db_id'},
                $accession,
                $accession,
                $version,
                '\N',
                'COORDINATE_OVERLAP',
                '\N'                                  # FIXME (possibly)
    );
  }
  $fh->close();

  log_progress("Dumping for 'xref' done\n");

} ## end sub dump_xref

#-----------------------------------------------------------------------

  my ( $fmt, @params ) = @_;
  
  return if (!$verbose);
  printf( STDERR "COORD==> %s", sprintf( $fmt, @params ) );
}

1;

  my ($self, $arg) = @_;

  (defined $arg) &&
    ($self->{_mapper} = $arg );
  return $self->{_mapper};

  my($class, $mapper) = @_;

  my $self ={};
  bless $self,$class;
  $self->core($mapper->core);
  $self->xref($mapper->xref);
  $self->mapper($mapper);
  $verbose = $mapper->verbose();
  return $self;

  my ( $self, $do_upload ) = @_;


  my $sth_stat = $self->xref->dbc->prepare("insert into process_status (status, date) values('coordinate_xrefs_started',now())");
  $sth_stat->execute();
  $sth_stat->finish;

  my $xref_db = $self->xref();
  my $core_db = $self->core();

  my $species = $core_db->species();
  my $species_id = $self->mapper->species_id;
#    XrefMapper::BasicMapper::get_species_id_from_species_name( $xref_db, $species );


  # We only do coordinate mapping for mouse and human for now.
  if ( !( $species eq 'mus_musculus' || $species eq 'homo_sapiens' ) ) {
    my $sth_stat = $self->xref->dbc->prepare("insert into process_status (status, date) values('coordinate_xref_finished',now())");
    $sth_stat->execute();
    $sth_stat->finish;
    return;
  }

  my $output_dir = $core_db->dir();

  my $xref_filename = catfile( $output_dir, 'xref_coord.txt' );
  my $object_xref_filename =
    catfile( $output_dir, 'object_xref_coord.txt' );
  my $unmapped_reason_filename =
    catfile( $output_dir, 'unmapped_reason_coord.txt' );
  my $unmapped_object_filename =
    catfile( $output_dir, 'unmapped_object_coord.txt' );

  my $xref_dbh = $xref_db->dbc()->db_handle();
  my $core_dbh = $core_db->dbc()->db_handle();

  ######################################################################
  # Figure out the last used 'xref_id', 'object_xref_id',              #
  # 'unmapped_object_id', and 'unmapped_reason_id' from the Core       #
  # database.                                                          #
  ######################################################################

  my $xref_id =
    $core_dbh->selectall_arrayref('SELECT MAX(xref_id) FROM xref')
    ->[0][0];
  my $object_xref_id = $core_dbh->selectall_arrayref(
                 'SELECT MAX(object_xref_id) FROM object_xref')->[0][0];
  my $unmapped_object_id = $core_dbh->selectall_arrayref(
         'SELECT MAX(unmapped_object_id) FROM unmapped_object')->[0][0];
  my $unmapped_reason_id = $core_dbh->selectall_arrayref(
         'SELECT MAX(unmapped_reason_id) FROM unmapped_reason')->[0][0];

  log_progress( "Last used xref_id            is %d\n", $xref_id );
  log_progress( "Last used object_xref_id     is %d\n",
                $object_xref_id );
  log_progress( "Last used unmapped_object_id is %d\n",
                $unmapped_object_id );
  log_progress( "Last used unmapped_reason_id is %d\n",
                $unmapped_reason_id );

  ######################################################################
  # Get an 'analysis_id', or discover that we need to add our analysis #
  # to the 'analyis' table later.                                      #
  ######################################################################

  my $analysis_params =
    sprintf( "weights(coding,ensembl)="
               . "%.2f,%.2f;"
               . "transcript_score_threshold=" . "%.2f",
             $coding_weight, $ens_weight, $transcript_score_threshold );

  my $analysis_sql = qq(
    SELECT  analysis_id
    FROM    analysis
    WHERE   logic_name = 'XrefCoordinateMapping'
    AND     parameters = ?
  );

  my $analysis_sth = $core_dbh->prepare($analysis_sql);
  $analysis_sth->execute($analysis_params);

  my $analysis_id = $analysis_sth->fetchall_arrayref()->[0][0];
  if ( !defined($analysis_id) ) {
    $analysis_id =
      $core_dbh->selectall_arrayref( "SELECT analysis_id FROM analysis "
               . "WHERE logic_name = 'XrefCoordinateMapping'" )->[0][0];

    if ( defined($analysis_id) && $do_upload ) {
      log_progress(   "Will update 'analysis' table "
                    . "with new parameter settings\n" );

      #-----------------------------------------------------------------
      # Update an existing analysis.
      #-----------------------------------------------------------------

      my $sql = qq(
        UPDATE  analysis
        SET     created = now(), parameters = ?
        WHERE   analysis_id = ?
      );

      $core_dbh->do( $sql, undef, $analysis_params, $analysis_id );

    } else {
      log_progress("Can not find analysis ID for this analysis:\n");
      log_progress("  logic_name = 'XrefCoordinateMapping'\n");
      log_progress( "  parameters = '%s'\n", $analysis_params );

      if ($do_upload) {

        #---------------------------------------------------------------
        # Store a new analysis.
        #---------------------------------------------------------------

        log_progress("A new analysis will be added\n");

        $analysis_id = $core_dbh->selectall_arrayref(
                       'SELECT MAX(analysis_id) FROM analysis')->[0][0];
        log_progress( "Last used analysis_id is %d\n", $analysis_id );

        my $sql = 'INSERT INTO analysis '
          . 'VALUES(?, now(), ?,\N ,\N ,\N , ?,\N ,\N , ?, ?,\N ,\N ,\N )';
        my $sth = $core_dbh->prepare($sql);

        $sth->execute( ++$analysis_id,   'XrefCoordinateMapping',
                       'xref_mapper.pl', $analysis_params,
                       'CoordinateMapper.pm' );
      }
    } ## end else [ if ( defined($analysis_id...
  } ## end if ( !defined($analysis_id...

  if ( defined($analysis_id) ) {
    log_progress( "Analysis ID                  is %d\n",
                  $analysis_id );
  }

  ######################################################################
  # Read and store available Xrefs from the Xref database.             #
  ######################################################################

  my %unmapped;
  my %mapped;

  my $xref_sql = qq(
    SELECT  coord_xref_id, source_id, accession
    FROM    coordinate_xref
    WHERE   species_id = ?
  );

  my $xref_sth = $xref_dbh->prepare($xref_sql);
  $xref_sth->execute($species_id);

  my $external_db_id;
  while ( my $xref = $xref_sth->fetchrow_hashref() ) {
    $external_db_id ||=
      $XrefMapper::BasicMapper::source_to_external_db{ $xref->{
        'source_id'} };
    $external_db_id ||= 11000;    # FIXME (11000 is 'UCSC')

    $unmapped{ $xref->{'coord_xref_id'} } = {
                   'external_db_id' => $external_db_id,
                   'accession'      => $xref->{'accession'},
                   'reason'         => 'No overlap',
                   'reason_full' =>
                     'No coordinate overlap with any Ensembl transcript'
    };
  }
  $xref_sth->finish();

  ######################################################################
  # Do coordinate matching.                                            #
  ######################################################################

  my $core_db_adaptor =
    Bio::EnsEMBL::DBSQL::DBAdaptor->new(
                                   -host => $core_db->dbc()->host(),
                                   -port => $core_db->dbc()->port(),
                                   -user => $core_db->dbc()->username(),
                                   -pass => $core_db->dbc()->password(),
                                   -dbname => $core_db->dbc()->dbname(),
    );

  my $slice_adaptor = $core_db_adaptor->get_SliceAdaptor();
  my @chromosomes   = @{ $slice_adaptor->fetch_all('Chromosome') };

  my $sql = qq(
    SELECT    coord_xref_id, accession,
              txStart, txEnd,
              cdsStart, cdsEnd,
              exonStarts, exonEnds
    FROM      coordinate_xref
    WHERE     species_id = ?
    AND       chromosome = ? AND strand   = ?
    AND       ((txStart >= ? AND txStart <= ?)    -- txStart in region
    OR         (txEnd   >= ? AND txEnd   <= ?)    -- txEnd in region
    OR         (txStart <= ? AND txEnd   >= ?))   -- region is contained
    ORDER BY  accession
  );

  foreach my $chromosome (@chromosomes) {
    my $chr_name = $chromosome->seq_region_name();

    log_progress( "Processing chromsome '%s'\n", $chr_name );

    my @genes = @{ $chromosome->get_all_Genes( undef, undef, 1 ) };

    log_progress( "There are %4d genes on chromosome '%s'\n",
                  scalar(@genes), $chr_name );

    while ( my $gene = shift(@genes) ) {
      my @transcripts = @{ $gene->get_all_Transcripts() };

      my %gene_result;

      foreach my $transcript ( sort { $a->start() <=> $b->start() }
                               @transcripts )
      {

        ################################################################
        # For each Ensembl transcript:                                 #
        #   1. Register all Ensembl exons in a RangeRegistry.          #
        #                                                              #
        #   2. Find all transcripts in the external database that are  #
        #      within the range of this Ensembl transcript.            #
        #                                                              #
        # For each of those external transcripts:                      #
        #   3. Calculate the overlap of the exons of the external      #
        #      transcript with the Ensembl exons using the             #
        #      overlap_size() method in the RangeRegistry.             #
        #                                                              #
        #   4. Register the external exons in their own RangeRegistry. #
        #                                                              #
        #   5. Calculate the overlap of the Ensembl exons with the     #
        #      external exons as in step 3.                            #
        #                                                              #
        #   6. Calculate the match score.                              #
        #                                                              #
        #   7. Decide whether or not to keep the match.                #
        ################################################################

        my @exons = @{ $transcript->get_all_Exons() };

        my %transcript_result;

        # '$rr1' is the RangeRegistry holding Ensembl exons for one
        # transcript at a time.
        my $rr1 = Bio::EnsEMBL::Mapper::RangeRegistry->new();

        my $coding_transcript;
        if ( defined( $transcript->translation() ) ) {
          $coding_transcript = 1;
        } else {
          $coding_transcript = 0;
        }

        foreach my $exon (@exons) {

          #-------------------------------------------------------------
          # Register each exon in the RangeRegistry.  Register both the
          # total length of the exon and the coding range of the exon.
          #-------------------------------------------------------------

          $rr1->check_and_register( 'exon', $exon->start(),
                                    $exon->end() );

          if (    $coding_transcript
               && defined( $exon->coding_region_start($transcript) )
               && defined( $exon->coding_region_end($transcript) ) )
          {
            $rr1->check_and_register(
                                'coding',
                                $exon->coding_region_start($transcript),
                                $exon->coding_region_end($transcript) );
          }
        }

        #---------------------------------------------------------------
        # Get hold of all transcripts from the external database that
        # overlaps with this Ensembl transcript.
        #---------------------------------------------------------------

        my $sth = $xref_dbh->prepare_cached($sql);
        $sth->execute( $species_id,        $chr_name,
                       $gene->strand(),    $transcript->start(),
                       $transcript->end(), $transcript->start(),
                       $transcript->end(), $transcript->start(),
                       $transcript->end() );

        my ( $coord_xref_id, $accession, $txStart, $txEnd, $cdsStart,
             $cdsEnd, $exonStarts, $exonEnds );

        $sth->bind_columns(\(
                         $coord_xref_id, $accession, $txStart, $txEnd,
                           $cdsStart, $cdsEnd, $exonStarts, $exonEnds
                        ) );

        while ( $sth->fetch() ) {
          my @exonStarts = split( /,\s*/, $exonStarts );
          my @exonEnds   = split( /,\s*/, $exonEnds );
          my $exonCount = scalar(@exonStarts);

          # '$rr2' is the RangeRegistry holding exons from the external
          # transcript, for one transcript at a time.
          my $rr2 = Bio::EnsEMBL::Mapper::RangeRegistry->new();

          my $exon_match   = 0;
          my $coding_match = 0;

          my $coding_count = 0;

          for ( my $i = 0 ; $i < $exonCount ; ++$i ) {

            #-----------------------------------------------------------
            # Register the exons from the external database in the same
            # was as with the Ensembl exons, and calculate the overlap
            # of the external exons with the previously registered
            # Ensembl exons.
            #-----------------------------------------------------------

            my $overlap =
              $rr1->overlap_size( 'exon', $exonStarts[$i],
                                  $exonEnds[$i] );

            $exon_match +=
              $overlap/( $exonEnds[$i] - $exonStarts[$i] + 1 );

            $rr2->check_and_register( 'exon', $exonStarts[$i],
                                      $exonEnds[$i] );

            if ( !defined($cdsStart) || !defined($cdsEnd) ) {
              # Non-coding transcript.
            } else {
              my $codingStart = (   $exonStarts[$i] > $cdsStart
                                  ? $exonStarts[$i]
                                  : $cdsStart );
              my $codingEnd =
                ( $exonEnds[$i] < $cdsEnd ? $exonEnds[$i] : $cdsEnd );

              if ( $codingStart < $codingEnd ) {
                my $coding_overlap =
                  $rr1->overlap_size( 'coding', $codingStart,
                                      $codingEnd );

                $coding_match +=
                  $coding_overlap/( $codingEnd - $codingStart + 1 );

                $rr2->check_and_register( 'coding', $codingStart,
                                          $codingEnd );

                ++$coding_count;
              }
            }
          } ## end for ( my $i = 0 ; $i < ...

          my $rexon_match   = 0;
          my $rcoding_match = 0;

          my $rcoding_count = 0;

          foreach my $exon (@exons) {

            #-----------------------------------------------------------
            # Calculate the overlap of the Ensembl exons with the
            # external exons.
            #-----------------------------------------------------------

            my $overlap =
              $rr2->overlap_size( 'exon', $exon->start(),
                                  $exon->end() );

            $rexon_match +=
              $overlap/( $exon->end() - $exon->start() + 1 );

            if (    $coding_transcript
                 && defined( $exon->coding_region_start($transcript) )
                 && defined( $exon->coding_region_end($transcript) ) )
            {
              my $coding_overlap =
                $rr2->overlap_size( 'coding',
                                    $exon->coding_region_start(
                                                           $transcript),
                                    $exon->coding_region_end(
                                                            $transcript)
                );

              $rcoding_match +=
                $coding_overlap/
                ( $exon->coding_region_end($transcript) -
                  $exon->coding_region_start($transcript) +
                  1 );

              ++$rcoding_count;
            }
          } ## end foreach my $exon (@exons)

          #-------------------------------------------------------------
          # Calculate the match score.
          #-------------------------------------------------------------

          my $score = ( ( $exon_match + $ens_weight*$rexon_match ) +
                          $coding_weight*(
                              $coding_match + $ens_weight*$rcoding_match
                          )
            )/( ( $exonCount + $ens_weight*scalar(@exons) ) +
                  $coding_weight*(
                              $coding_count + $ens_weight*$rcoding_count
                  ) );

          if ( !defined( $transcript_result{$coord_xref_id} )
               || $transcript_result{$coord_xref_id} < $score )
          {
            $transcript_result{$coord_xref_id} = $score;
          }

        } ## end while ( $sth->fetch() )
        $sth->finish();

        #---------------------------------------------------------------
        # Apply transcript threshold and pick the best match(es) for
        # this transcript.
        #---------------------------------------------------------------

        my $best_score;
        foreach my $coord_xref_id (
             sort( { $transcript_result{$b} <=> $transcript_result{$a} }
                   keys(%transcript_result) ) )
        {
          my $score = $transcript_result{$coord_xref_id};

          if ( $score > $transcript_score_threshold ) {
            $best_score ||= $score;

            if ( sprintf( "%.3f", $score ) eq
                 sprintf( "%.3f", $best_score ) )
            {
              if ( exists( $unmapped{$coord_xref_id} ) ) {
                $mapped{$coord_xref_id} = $unmapped{$coord_xref_id};
                delete( $unmapped{$coord_xref_id} );
                $mapped{$coord_xref_id}{'reason'}      = undef;
                $mapped{$coord_xref_id}{'reason_full'} = undef;
              }

              push( @{ $mapped{$coord_xref_id}{'mapped_to'} }, {
                      'ensembl_id'          => $transcript->dbID(),
                      'ensembl_object_type' => 'Transcript'
                    } );

              # This is now a candidate Xref for the gene.
              if ( !defined( $gene_result{$coord_xref_id} )
                   || $gene_result{$coord_xref_id} < $score )
              {
                $gene_result{$coord_xref_id} = $score;
              }

            } elsif ( exists( $unmapped{$coord_xref_id} ) ) {
              $unmapped{$coord_xref_id}{'reason'} =
                'Was not best match';
              $unmapped{$coord_xref_id}{'reason_full'} =
                sprintf(
                       "Did not top best transcript match score (%.2f)",
                       $best_score );
              if ( !defined( $unmapped{$coord_xref_id}{'score'} )
                   || $score > $unmapped{$coord_xref_id}{'score'} )
              {
                $unmapped{$coord_xref_id}{'score'} = $score;
                $unmapped{$coord_xref_id}{'ensembl_id'} =
                  $transcript->dbID();
              }
            }

          } elsif ( exists( $unmapped{$coord_xref_id} )
                    && $unmapped{$coord_xref_id}{'reason'} ne
                    'Was not best match' )
          {
            $unmapped{$coord_xref_id}{'reason'} =
              'Did not meet threshold';
            $unmapped{$coord_xref_id}{'reason_full'} =
              sprintf( "Match score for transcript "
                         . "lower than threshold (%.2f)",
                       $transcript_score_threshold );
            if ( !defined( $unmapped{$coord_xref_id}{'score'} )
                 || $score > $unmapped{$coord_xref_id}{'score'} )
            {
              $unmapped{$coord_xref_id}{'score'} = $score;
              $unmapped{$coord_xref_id}{'ensembl_id'} =
                $transcript->dbID();
            }
          }
        } ## end foreach my $coord_xref_id (...

      } ## end foreach my $transcript ( sort...

      #-----------------------------------------------------------------
      # Pick the best match(es) for this gene.
      #-----------------------------------------------------------------

      my $best_score;
      foreach my $coord_xref_id (
                         sort( { $gene_result{$b} <=> $gene_result{$a} }
                               keys(%gene_result) ) )
      {
        my $score = $gene_result{$coord_xref_id};

        $best_score ||= $score;

        if (
           sprintf( "%.3f", $score ) eq sprintf( "%.3f", $best_score ) )
        {
          push( @{ $mapped{$coord_xref_id}{'mapped_to'} }, {
                  'ensembl_id'          => $gene->dbID(),
                  'ensembl_object_type' => 'Gene'
                } );
        }
      }

    } ## end while ( my $gene = shift(...
  } ## end foreach my $chromosome (@chromosomes)

  # Make all dumps.  Order is important.
  dump_xref( $xref_filename, $xref_id,\% mapped,\% unmapped );
  dump_object_xref( $object_xref_filename, $object_xref_id,\% mapped );
  dump_unmapped_reason( $unmapped_reason_filename, $unmapped_reason_id,\%
                        unmapped );
  dump_unmapped_object( $unmapped_object_filename, $unmapped_object_id,
                        $analysis_id,\% unmapped );

  if ($do_upload) {
    # Order is important!
    upload_data( 'unmapped_reason', $unmapped_reason_filename,
                 $external_db_id, $core_dbh );
    upload_data( 'unmapped_object', $unmapped_object_filename,
                 $external_db_id, $core_dbh );
    upload_data( 'object_xref', $object_xref_filename, $external_db_id,
                 $core_dbh );
    upload_data( 'xref', $xref_filename, $external_db_id, $core_dbh );
  }

  $sth_stat = $self->xref->dbc->prepare("insert into process_status (status, date) values('coordinate_xref_finished',now())");
  $sth_stat->execute();
  $sth_stat->finish;
  
} ## end sub run_coordinatemapping

#-----------------------------------------------------------------------

  my ( $table_name, $filename, $external_db_id, $dbh ) = @_;

  ######################################################################
  # Upload data from a file to a table.                                #
  ######################################################################

  if ( !-r $filename ) {
    croak( sprintf( "Can not open '%s' for reading", $filename ) );
  }

  my $cleanup_sql = '';
  if ( $table_name eq 'unmapped_reason' ) {
    $cleanup_sql = qq(
    DELETE  ur
    FROM    unmapped_object uo,
            unmapped_reason ur
    WHERE   uo.external_db_id       = ?
    AND     ur.unmapped_reason_id   = uo.unmapped_reason_id);
  } elsif ( $table_name eq 'unmapped_object' ) {
    $cleanup_sql = qq(
    DELETE  uo
    FROM    unmapped_object uo
    WHERE   uo.external_db_id = ?);
  } elsif ( $table_name eq 'object_xref' ) {
    $cleanup_sql = qq(
    DELETE  ox
    FROM    xref x,
            object_xref ox
    WHERE   x.external_db_id    = ?
    AND     ox.xref_id          = x.xref_id);
  } elsif ( $table_name eq 'xref' ) {
    $cleanup_sql = qq(
    DELETE  x
    FROM    xref x
    WHERE   x.external_db_id    = ?);
  } else {
    croak( sprintf( "Table '%s' is unknown\n", $table_name ) );
  }

  my $load_sql =
    sprintf( "LOAD DATA LOCAL INFILE ? REPLACE INTO TABLE %s",
             $table_name );

  log_progress(
          "Removing old data (external_db_id = '%d') from table '%s'\n",
          $external_db_id, $table_name );

  my $rows = $dbh->do( $cleanup_sql, undef, $external_db_id )
    or croak( $dbh->strerr() );

  log_progress( "Removed %d rows\n", $rows );

  log_progress( "Uploading for '%s' from '%s'\n",
                $table_name, $filename );

  $rows = $dbh->do( $load_sql, undef, $filename )
    or croak( $dbh->errstr() );

  $dbh->do("OPTIMIZE TABLE $table_name") or croak( $dbh->errstr() );

  log_progress( "Uploading for '%s' done (%d rows)\n",
                $table_name, $rows );

} ## end sub upload_data

#-----------------------------------------------------------------------