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=head1 NAME

Lucy::Index::DataReader - Abstract base class for reading index data.

=head1 SYNOPSIS

    # Abstract base class.



=head1 DESCRIPTION

DataReader is the companion class to
L<DataWriter|Lucy::Index::DataWriter>.  Every index component will
implement one of each.

=head1 CONSTRUCTORS

=head2 new( I<[labeled params]> )

    my $reader = MyDataReader->new(
        schema   => $seg_reader->get_schema,      # default undef
        folder   => $seg_reader->get_folder,      # default undef
        snapshot => $seg_reader->get_snapshot,    # default undef
        segments => $seg_reader->get_segments,    # default undef
        seg_tick => $seg_reader->get_seg_tick,    # default -1
    );

=over

=item *

B<schema> - A Schema.

=item *

B<folder> - A Folder.

=item *

B<snapshot> - A Snapshot.

=item *

B<segments> - An array of Segments.

=item *

B<seg_tick> - The array index of the Segment object within the
C<< segments >> array that this particular DataReader is assigned
to, if any.  A value of -1 indicates that no Segment should be
assigned.

=back



=head1 ABSTRACT METHODS

=head2 aggregator( I<[labeled params]> )

Create a reader which aggregates the output of several lower level
readers.  Return undef if such a reader is not valid.

=over

=item *

B<readers> - An array of DataReaders.

=item *

B<offsets> - Doc id start offsets for each reader.

=back



=head1 METHODS

=head2 get_schema()

Accessor for "schema" member var.

=head2 get_folder()

Accessor for "folder" member var.

=head2 get_snapshot()

Accessor for "snapshot" member var.

=head2 get_segments()

Accessor for "segments" member var.

=head2 get_segment()

Accessor for "segment" member var.

=head2 get_seg_tick()

Accessor for "seg_tick" member var.



=head1 INHERITANCE

Lucy::Index::DataReader isa L<Lucy::Object::Obj>.


=cut