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=encoding utf8

=head1 NAME

Lucy::Index::PostingListReader - Read postings data.

=head1 SYNOPSIS

    my $posting_list_reader 
        = $seg_reader->obtain("Lucy::Index::PostingListReader");
    my $posting_list = $posting_list_reader->posting_list(
        field => 'title', 
        term  => 'foo',
    );

=head1 DESCRIPTION

PostingListReaders produce L<PostingList|Lucy::Index::PostingList>
objects which convey document matching information.

=head1 ABSTRACT METHODS

=head2 posting_list

    my $posting_list = $posting_list_reader->posting_list(
        field => $field,  # default: undef
        term  => $term,   # default: undef
    );

Returns a PostingList, or undef if either C<field> is
undef or C<field> is not present in any documents.

=over

=item *

B<field> - A field name.

=item *

B<term> - If supplied, the PostingList will be pre-located to this
term using L<seek()|Lucy::Index::PostingList/seek>.

=back

=head1 METHODS

=head2 aggregator

    my $result = $posting_list_reader->aggregator(
        readers => $readers,  # required
        offsets => $offsets,  # required
    );

Returns undef since PostingLists may only be iterated at the
segment level.

=head1 INHERITANCE

Lucy::Index::PostingListReader isa L<Lucy::Index::DataReader> isa Clownfish::Obj.

=cut