-# $Id: Node.pm,v 1.1 2004-12-17 15:29:00 mike Exp $
+# $Id: Node.pm,v 1.3 2004-12-20 09:46:58 mike Exp $
package Net::Z3950::PQF::Node;
=head1 SYNOPSIS
- $node = new Net::Z3950::PQF::Term('unix');
+ $node = new Net::Z3950::PQF::TermNode('unix');
$node->isa("Net::Z3950::PQF::Node") or die "oops";
=head1 DESCRIPTION
I<value>
which may be either an integer or a string.
+=item C<RsetNode>
+
+Represents a result-set node, a reference to the name of a prior
+result set. The result-set name is accompanied by zero or more
+attributes as above.
+
=item C<AndNode>
Represents an AND node with two sub-nodes.
-package Net::Z3950::PQF::TermNode;
+# PRIVATE base class, used as base by TermNode and RsetNode
+package Net::Z3950::PQF::LeafNode;
+our @ISA = qw(Net::Z3950::PQF::Node);
sub new {
my $class = shift();
- my($term, @attrs) = @_;
+ my($value, @attrs) = @_;
return bless {
- term => $term,
+ value => $value,
attrs => [ @attrs ],
}, $class;
}
my($level) = @_;
die "render() called with no level" if !defined $level;
- my $text = ("\t" x $level) . "term: " . $this->{term} . "\n";
+ my $text = ("\t" x $level) . $this->_name() . ": " . $this->{value} . "\n";
foreach my $attr (@{ $this->{attrs} }) {
my($set, $type, $val) = @$attr;
$text .= ("\t" x ($level+1)) . "attr: $set $type=$val\n";
+package Net::Z3950::PQF::TermNode;
+our @ISA = qw(Net::Z3950::PQF::LeafNode);
+
+sub _name { "term" }
+
+
+
+package Net::Z3950::PQF::RsetNode;
+our @ISA = qw(Net::Z3950::PQF::LeafNode);
+
+sub _name { "rset" }
+
+
+
# PRIVATE class, used as base by AndNode, OrNode and NotNode
package Net::Z3950::PQF::BooleanNode;
+our @ISA = qw(Net::Z3950::PQF::Node);
sub new {
my $class = shift();
package Net::Z3950::PQF::AndNode;
-use vars qw(@ISA);
-@ISA = qw(Net::Z3950::PQF::BooleanNode);
+our @ISA = qw(Net::Z3950::PQF::BooleanNode);
sub _op { "and" }
package Net::Z3950::PQF::OrNode;
-use vars qw(@ISA);
-@ISA = qw(Net::Z3950::PQF::BooleanNode);
+our @ISA = qw(Net::Z3950::PQF::BooleanNode);
sub _op { "or" }
package Net::Z3950::PQF::NotNode;
-use vars qw(@ISA);
-@ISA = qw(Net::Z3950::PQF::BooleanNode);
+our @ISA = qw(Net::Z3950::PQF::BooleanNode);
sub _op { "not" }