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package Data::Pipeline::Aggregator::Union; |
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use Moose; |
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extends 'Data::Pipeline::Aggregator'; |
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use Data::Pipeline::Types qw( Iterator ); |
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has actions => ( |
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isa => 'ArrayRef', |
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is => 'rw', |
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predicate => 'has_actions', |
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default => sub { [ ] }, |
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lazy => 1 |
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); |
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sub transform { |
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my($self, @iterators) = @_; |
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$_ = to_Iterator($_) for @iterators; |
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my $n = scalar(@{$self -> actions}); |
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$n = scalar(@iterators) if scalar(@iterators) < $n; |
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while( $n > 0 ) { |
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$n--; |
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$iterators[$n] = $self -> actions -> [$n] -> transform( $iterators[$n] ); |
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} |
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# we want to round-robin between them |
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return Data::Pipeline::Iterator -> new( |
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source => Data::Pipeline::Source::Iterator -> new( |
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has_next => sub { |
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@iterators = grep { !$_ -> finished } @iterators; |
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return 1 if @iterators; |
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return 0; |
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}, |
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get_next => sub { |
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my $i; |
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$i = shift @iterators while $i && $i -> finished; |
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return unless defined $i; |
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push @iterators, $i; |
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return $i -> next; |
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} |
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) |
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); |
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} |
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1; |
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__END__ |