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=pod |
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=head1 NAME |
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ETL::Pipeline::Input::Excel - Input source for Microsoft Excel spreadsheets |
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=head1 SYNOPSIS |
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use ETL::Pipeline; |
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ETL::Pipeline->new( { |
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input => ['Excel', matching => qr/\.xlsx$/i], |
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mapping => {First => 'A', Second => qr/ID\s*Num/i}, |
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output => ['UnitTest'] |
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} )->process; |
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=head1 DESCRIPTION |
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B<ETL::Pipeline::Input::Excel> defines an input source for reading MS Excel |
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spreadsheets. It uses L<Spreadsheet::XLSX> or L<Spreadsheet::ParseExcel>, |
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depending on the file type (XLSX or XLS). |
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=cut |
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use 5.014000; |
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use warnings; |
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package ETL::Pipeline::Input::Excel; |
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use Moose; |
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use Carp; |
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use Spreadsheet::ParseExcel; |
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our $VERSION = '2.00'; |
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=head1 METHODS & ATTRIBUTES |
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=head2 Arguments for L<ETL::Pipeline/input> |
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B<ETL::Pipeline::Input::DelimitedText> implements L<ETL::Pipeline::Input::File> |
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and L<ETL::Pipeline::Input::TabularFile>. It supports all of the attributes |
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from these roles. |
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=head3 return_blank_rows |
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L<Spreadsheet::XLSX> or L<Spreadsheet::ParseExcel> can't identify merged rows. |
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Merged rows simply appear as blanks. So by default, |
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B<ETL::Pipeline::Input::Excel> skips over blank rows. Merged rows look like one |
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record. When counting headers, do not count empty rows. |
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This boolean attribute overrides the default behaviour. |
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B<ETL::Pipeline::Input::Excel> returns blank rows as an empty record. |
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=cut |
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has 'return_blank_rows' => ( |
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default => 0, |
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is => 'rw', # Allow callbacks to change this flag! |
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isa => 'Bool', |
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); |
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=head3 worksheet |
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B<worksheet> reads data from a specific worksheet. By default, |
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B<ETL::Pipeline::Input::Excel> uses the first worksheet. |
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B<worksheet> accepts a string or regular expression. As a string, B<worksheet> |
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looks for an exact match. As a regular expression, B<worksheet> finds the first |
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worksheet whose name matches the regular expression. Note that B<worksheet> |
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stops looking once it finds the first mach. |
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B<ETL::Pipeline::Input::Excel> throws an error if it cannot find a worksheet |
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with a matching name. |
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=cut |
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has 'worksheet' => ( |
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is => 'ro', |
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isa => 'Maybe[RegexpRef|Str]', |
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); |
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=head3 password |
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B<password> works with encrypted files. B<ETL::Pipeline::Input::Excel> decrypts |
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the file automatically. |
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B<Warning:> B<password> only works with Excel 2003 file (XLS). Encrypted XLSX |
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files always fail. L<Spreadsheet::XLSX> does not support encryption. |
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=cut |
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has 'password' => ( |
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is => 'ro', |
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isa => 'Maybe[Str]', |
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); |
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=head2 Called from L<ETL::Pipeline/process> |
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=head3 get |
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B<get> retrieves one field from the current record. B<get> accepts one |
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parameter. That parameter can be an index number, a column name, or a regular |
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expression to match against column names. |
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$etl->get( 0 ); |
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$etl->get( 'A' ); |
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$etl->get( 'First' ); |
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$etl->get( qr/\bfirst\b/i ); |
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=cut |
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120
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sub get { |
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my ($self, $column) = @_; |
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return undef unless $column =~ m/^\d+$/; |
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my $row = $self->row; |
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my $cell = $self->tab->{Cells}->[$row][$column]; |
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return defined( $cell ) ? $cell->value : undef; |
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} |
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131
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=head3 next_record |
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Read one record from the file for processing. B<next_record> returns a boolean. |
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I<True> means success. I<False> means it reached the end of the file. |
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136
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while ($input->next_record) { |
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... |
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} |
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140
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=cut |
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142
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sub next_record { |
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my ($self) = @_; |
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# If the last read grabbed the last row, then we've reached the end. This |
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# read will fail. |
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my $row = $self->row; |
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my $last_row = $self->tab->{MaxRow}; |
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return 0 if $row == $last_row; |
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151
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# We're still in the data, so retrieve this row. |
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my $empty = 1; |
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my $cells = $self->tab->{Cells}; |
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155
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# Skip blank rows, but don't loop forever. |
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while ($row <= $last_row && $empty) { |
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$row++; |
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if ($self->return_blank_rows) { |
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$empty = 0; |
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} else { |
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$empty = 1; |
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foreach my $column ($self->tab->{MinCol} .. $self->tab->{MaxCol}) { |
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if (hascontent( $cells->[$row][$column]->value )) { |
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$empty = 0; |
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last; |
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} |
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} |
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} |
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} |
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$self->row( $row ); |
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# If it's an emtpy row, then we reached the end of the data. |
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return ($empty ? 0 : 1); |
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} |
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177
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=head3 get_column_names |
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179
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B<get_column_names> reads the field names from the first row in the file. |
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L</get> can match field names using regular expressions. |
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182
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=cut |
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184
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sub get_column_names { |
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2
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my ($self) = @_; |
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187
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$self->next_record; |
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$self->add_column( $self->get( $_ ), $_ ) |
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foreach ($self->tab->{MinCol} .. $self->tab->{MaxCol}); |
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} |
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192
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193
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=head3 configure |
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195
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B<configure> opens the MS Excel spread sheet for reading. It creates the |
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correct worksheet object for XLS versus XLSX. XLS and XLSX files are different |
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formats. B<ETL::Pipeline::Input::Excel> uses the correct module for this |
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specific file. |
199
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200
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Both Excel parsers use coulmn numbers, starting with zero. B<configure> |
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automatically creates aliases for the column letters. |
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203
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=cut |
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205
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sub configure { |
206
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my ($self) = @_; |
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208
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# Create the correct worksheet objects based on the file format. |
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my $path = $self->file->stringify; |
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my $workbook; |
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212
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if ($path =~ m/\.xls$/i) { |
213
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my $excel = Spreadsheet::ParseExcel->new( Password => $self->password ); |
214
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$workbook = $excel->parse( $path ); |
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croak "Unable to open the Excel file $path" unless defined $workbook; |
216
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} else { |
217
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$workbook = Spreadsheet::XLSX->new( $path ); |
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croak "Unable to open the Excel file $path" unless defined $workbook; |
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} |
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221
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# Find the worksheet with data... |
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my $name = $self->worksheet; |
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my $worksheet; |
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if (hascontent( $name )) { |
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if (ref( $name ) eq 'Regexp') { |
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$worksheet = first { $_->get_name() =~ m/$name/ } $workbook->worksheets(); |
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} else { |
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$worksheet = $workbook->worksheet( $name ); |
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} |
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croak "No workseets match '$name'" unless defined $worksheet; |
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} else { |
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$worksheet = $workbook->worksheet( 0 ); |
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croak "'$path' has no worksheets" unless defined $worksheet; |
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} |
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$self->tab( $worksheet ); |
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# Convert the column numbers into their letter designations. Do this here |
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# instead of in getl_column_names. The letters apply to every spread sheet |
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# - even if no_column_names = 1, which bypasses get_column_names. |
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$self->add_column( int2col( $_ ), $_ ) |
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foreach ($worksheet->{MinCol} .. $worksheet->{MaxCol}); |
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# Start on the first row as defined by the spread sheet. |
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$self->row( $worksheet->{MinRow} - 1 ); |
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} |
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=head3 finish |
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B<finish> closes the file. |
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=cut |
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6
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sub finish {} |
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=head2 Other Methods & Attributes |
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=head3 row |
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261
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B<row> is the next row in the spreadsheet for reading. Because |
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B<ETL::Pipeline::Input::Excel> skips blank rows, the L</record_number> may not |
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match the row number. |
264
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265
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=cut |
266
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267
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has 'row' => ( |
268
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is => 'rw', |
269
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isa => 'Int', |
270
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); |
271
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272
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273
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=head3 tab |
274
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275
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B<tab> holds the current worksheet object. The Excel parsers return an object |
276
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for the tab (worksheet) with the data. It is set by L</find_worksheet>. |
277
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278
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=cut |
279
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280
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has 'tab' => ( |
281
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is => 'rw', |
282
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isa => 'Maybe[Spreadsheet::ParseExcel::Worksheet]', |
283
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); |
284
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285
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286
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|
=head1 SEE ALSO |
287
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288
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|
|
L<ETL::Pipeline>, L<ETL::Pipeline::Input>, L<ETL::Pipeline::Input::File>, |
289
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|
L<ETL::Pipeline::Input::Tabular> |
290
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291
|
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|
=cut |
292
|
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293
|
|
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|
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|
|
with 'ETL::Pipeline::Input::File'; |
294
|
|
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|
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|
|
with 'ETL::Pipeline::Input::Tabular'; |
295
|
|
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|
|
with 'ETL::Pipeline::Input'; |
296
|
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297
|
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298
|
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|
|
=head1 AUTHOR |
299
|
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|
300
|
|
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|
|
|
|
Robert Wohlfarth <robert.j.wohlfarth@vanderbilt.edu> |
301
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302
|
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|
|
=head1 LICENSE |
303
|
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|
304
|
|
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|
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|
|
Copyright 2016 (c) Vanderbilt University Medical Center |
305
|
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|
|
306
|
|
|
|
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|
|
This program is free software; you can redistribute it and/or modify it under |
307
|
|
|
|
|
|
|
the same terms as Perl itself. |
308
|
|
|
|
|
|
|
|
309
|
|
|
|
|
|
|
=cut |
310
|
|
|
|
|
|
|
|
311
|
1
|
|
|
1
|
|
52
|
no Moose; |
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
9
|
|
312
|
|
|
|
|
|
|
__PACKAGE__->meta->make_immutable; |