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package Data::Pipeline::Action; |
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use Moose::Role; |
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use MooseX::Types::Moose qw( ArrayRef ); |
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use Data::Pipeline::Types qw( Iterator ); |
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sub to { |
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Carp::croak "Action called expecting an output adapter"; |
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} |
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sub make_iterator { |
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my($self, $iterator) = @_; |
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Carp::confess "deprecated call to make_iterator"; |
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} |
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sub transform { |
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my($self, $iterator) = @_; |
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my $source; |
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$iterator = to_Iterator($iterator); |
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if( $self -> can('reduce_iterator') ) { |
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$source = Data::Pipeline::Iterator::Source -> new( |
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has_next => sub { 1 }, |
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get_next => sub { |
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my $r = $self -> reduce_iterator($iterator); |
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if( is_Iterator($r) ) { |
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$source -> has_next( $r -> has_next ); |
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$source -> get_next( $r -> get_next ); |
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return $r -> get_next -> (); |
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} |
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else { |
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$source -> has_next(sub{ 0 }); |
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return $r; |
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} |
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}, |
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); |
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} |
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elsif( $self -> can('map_item') ) { |
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$source = Data::Pipeline::Iterator::Source -> new( |
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has_next => sub { !$iterator -> finished }, |
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get_next => sub { $self -> map_item($iterator -> next) }, |
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); |
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} |
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else { |
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$source = inner; |
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} |
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my $it = Data::Pipeline::Iterator -> new( |
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source => $source, |
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); |
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return $it; |
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} |
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no Moose; |
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1; |
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__END__ |