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=head1 NAME

Lucy::Search::Collector - Process hits.

=head1 SYNOPSIS

    # Abstract base class.



=head1 DESCRIPTION

A Collector decides what to do with the hits that a
L<Matcher|Lucy::Search::Matcher> iterates through, based on how the
abstract collect() method is implemented.

Collectors operate on individual segments, but must operate within the
context of a larger collection.  Each time the collector moves to a new
segment, set_reader(), set_base() and set_matcher() will be called, and the
collector must take the updated information into account.

=head1 CONSTRUCTORS

=head2 new()

    package MyCollector;
    use base qw( Lucy::Search::Collector );
    our %foo;
    sub new {
        my $self = shift->SUPER::new;
        my %args = @_;
        $foo{$$self} = $args{foo};
        return $self;
    }

Abstract constructor.  Takes no arguments.



=head1 ABSTRACT METHODS

=head2 collect(doc_id)

Do something with a doc id.  (For instance, keep track of the docs
with the ten highest scores.)

=over

=item *

B<doc_id> - A segment document id.

=back



=head1 INHERITANCE

Lucy::Search::Collector isa Clownfish::Obj.


=cut