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=head1 NAME
Lucy::Search::PolyQuery - Base class for composite Query objects.
=head1 SYNOPSIS
sub walk {
my $query = shift;
if ( $query->isa("Lucy::Search::PolyQuery") ) {
if ( $query->isa("Lucy::Search::ORQuery") ) { ... }
elsif ( $query->isa("Lucy::Search::ANDQuery") ) { ... }
elsif ( $query->isa("Lucy::Search::RequiredOptionalQuery") ) {
...
}
elsif ( $query->isa("Lucy::Search::NOTQuery") ) { ... }
}
else { ... }
}
=head1 DESCRIPTION
PolyQuery serves as a shared base class for
L<ANDQuery|Lucy::Search::ANDQuery>,
L<ORQuery|Lucy::Search::ORQuery>,
L<NOTQuery|Lucy::Search::NOTQuery>, and
L<RequiredOptionalQuery|Lucy::Search::RequiredOptionalQuery>. All of
these classes may serve as nodes in composite Query with a tree structure
which may be walked.
=head1 INHERITANCE
Lucy::Search::PolyQuery isa L<Lucy::Search::Query> isa L<Lucy::Object::Obj>.
=cut
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