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=head1 NAME |
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ETL::Pipeline::Input::DelimitedText - Input source for CSV, tab, or pipe |
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delimited files |
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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 => ['DelimitedText', matching => qr/\.csv$/i], |
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mapping => {First => 'Header1', Second => 'Header2'}, |
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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::DelimitedText> defines an input source for reading |
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CSV (comma seperated variable), tab delimited, or pipe delimited files. It |
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uses L<Text::CSV> for parsing. |
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=cut |
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package ETL::Pipeline::Input::DelimitedText; |
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use Moose; |
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use 5.014000; |
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use warnings; |
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use Text::CSV; |
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our $VERSION = '2.00'; |
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=head1 METHODS & ATTRIBUTES |
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=head2 Arguments for L<ETL::Pipeline/input> |
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B<ETL::Pipeline::Input::DelimitedText> implements L<ETL::Pipeline::Input::File> |
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and L<ETL::Pipeline::Input::TabularFile>. It supports all of the attributes |
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from these roles. |
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In addition, B<ETL::Pipeline::Input::DelimitedText> makes available all of the |
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options for L<Text::CSV>. See L<Text::CSV> for a list. |
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# Pipe delimited, allowing embedded new lines. |
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$etl->input( 'DelimitedText', |
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matching => qr/\.dat$/i, |
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sep_char => '|', |
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binary => 1 |
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); |
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=cut |
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sub BUILD { |
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my %options; |
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while (my ($key, $value) = each %$arguments) { |
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$options{$key} = $value unless $self->meta->has_attribute( $key ); |
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} |
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$self->csv( Text::CSV->new( \%options ) ); |
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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( 'First' ); |
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$etl->get( qr/\bfirst\b/i ); |
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=cut |
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sub get { |
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my ($self, $index) = @_; |
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return undef unless $index =~ m/^\d+$/; |
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return $self->_get_value( $index ); |
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} |
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=head3 next_record |
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Read one record from the file for processing. B<next_record> returns a boolean. |
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I<True> means success. I<False> means it reached the end of the file. |
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while ($input->next_record) { |
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... |
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} |
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=cut |
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sub next_record { |
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my ($self) = @_; |
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my $fields = $self->csv->getline( $self->handle ); |
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if (defined $fields) { |
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$self->record( $fields ); |
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return 1; |
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} else { |
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return 0 if $self->csv->eof; |
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my ($code, $message, $position) = $self->csv->error_diag; |
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croak "Error $code: $message at character $position"; |
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} |
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} |
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=head3 get_column_names |
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B<get_column_names> reads the field names from the first row in the file. |
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L</get> can match field names using regular expressions. |
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=cut |
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sub get_column_names { |
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my ($self) = @_; |
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$self->next_record; |
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$self->add_column( $_ ) foreach ($self->fields); |
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} |
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=head3 configure |
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B<configure> opens the file for reading. It takes care of loading the column |
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names, if your file has them. |
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=cut |
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sub configure { |
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my ($self) = @_; |
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$self->handle( $self->file->openr() ); |
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die sprintf( 'Unable to open "%s" for reading', $self->file->stringify ) |
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unless defined $self->handle; |
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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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sub finish { close shift->handle; } |
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=head2 Other Methods & Attributes |
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=head3 record |
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162
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B<ETL::Pipeline::Input::DelimitedText> stores each record as a list of fields. |
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The field name corresponds with the file order of the field, starting at zero. |
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This attribute holds the current record. |
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=head3 fields |
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168
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Returns a list of fields from the current record. It dereferences L</record>. |
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=head3 number_of_fields |
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This method returns the number of fields in the current record. |
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=cut |
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has 'record' => ( |
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handles => { |
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fields => 'elements', |
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_get_value => 'get', |
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number_of_fields => 'count', |
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}, |
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is => 'rw', |
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isa => 'ArrayRef[Any]', |
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traits => [qw/Array/], |
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); |
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=head3 csv |
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190
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B<csv> holds a L<Text::CSV> object for reading the file. You can set options |
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for L<Text::CSV> in the L<ETL::Pipeline/input> command. |
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193
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=cut |
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195
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has 'csv' => ( |
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is => 'rw', |
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isa => 'Text::CSV', |
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); |
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200
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201
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=head3 handle |
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203
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The Perl file handle for reading data. L<Text::CSV> operates on a handle. |
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L</next_record> needs the handle. |
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206
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=cut |
207
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208
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has 'handle' => ( |
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is => 'rw', |
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isa => 'Maybe[FileHandle]', |
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); |
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213
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214
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=head1 SEE ALSO |
215
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216
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L<ETL::Pipeline>, L<ETL::Pipeline::Input>, L<ETL::Pipeline::Input::File>, |
217
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L<ETL::Pipeline::Input::Tabular> |
218
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219
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=cut |
220
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221
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with 'ETL::Pipeline::Input::File'; |
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with 'ETL::Pipeline::Input::Tabular'; |
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with 'ETL::Pipeline::Input'; |
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225
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226
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=head1 AUTHOR |
227
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228
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Robert Wohlfarth <robert.j.wohlfarth@vanderbilt.edu> |
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230
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=head1 LICENSE |
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232
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Copyright 2016 (c) Vanderbilt University Medical Center |
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234
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This program is free software; you can redistribute it and/or modify it under |
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the same terms as Perl itself. |
236
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237
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=cut |
238
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|
|
|
|
|
239
|
1
|
|
|
1
|
|
364
|
no Moose; |
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
6
|
|
240
|
|
|
|
|
|
|
__PACKAGE__->meta->make_immutable; |