File Coverage

blib/lib/Tree/Binary/Search/Node.pm

Criterion	Covered	Total	%
statement	32	32	100.0
branch	8	8	100.0
condition	2	3	66.6
subroutine	8	8	100.0
pod	4	4	100.0
total	54	55	98.1

package Tree::Binary::Search::Node;

use strict;
use warnings;

use Tree::Binary;

our $VERSION = '1.07';

our @ISA = qw(Tree::Binary);

## ----------------------------------------------------------------------------
## Tree::Binary::Search
## ----------------------------------------------------------------------------

### constructor

sub new {
	my ($_class, $node_key, $node_value) = @_;
	my $class = ref($_class) || $_class;
	my $binary_search_tree = {};
	bless($binary_search_tree, $class);
	$binary_search_tree->_init($node_key, $node_value);
	return $binary_search_tree;
}

### ---------------------------------------------------------------------------
### methods
### ---------------------------------------------------------------------------

## ----------------------------------------------------------------------------
## private methods

sub _init {
	my ($self, $node_key, $node_value) = @_;
    (defined($node_key)) || die "Insufficient Arguments : you must provide a node key";
	# set the value of the node key
    $self->{_node_key} = $node_key;
    $self->SUPER::_init($node_value);
}

## ----------------------------------------------------------------------------
## accessors

# this value is read-only, to change it
# would compromise the entire data-structure
sub getNodeKey {
	my ($self) = @_;
	return $self->{_node_key};
}

## ----------------------------------------------------------------------------
## mutator

sub makeRoot {
    my ($self) = @_;
    $self->{_parent} = undef;
    unless ($self->isLeaf()) {
        $self->fixDepth();
    }
    else {
        $self->{_depth} = 0;
    }
}

## ----------------------------------------------------------------------------
## cloning

sub clone {
    my ($self) = @_;
    # first clone the value in the node
    my $cloned_node = Tree::Binary::_cloneNode($self->getNodeValue());
    # create a new Tree::Simple object
    # here with the cloned node, however
    # we do not assign the parent node
    # since it really does not make a lot
    # of sense. To properly clone it would
    # be to clone back up the tree as well,
    # which IMO is not intuitive. So in essence
    # when you clone a tree, you detach it from
    # any parentage it might have
    my $clone = $self->new($self->{_node_key} => $cloned_node);
    # however, because it is a recursive thing
    # when you clone all the children, and then
    # add them to the clone, you end up setting
    # the parent of the children to be that of
    # the clone (which is correct)
    $clone->setLeft($self->{_left}->clone()) if $self->hasLeft();
    $clone->setRight($self->{_right}->clone()) if $self->hasRight();
    # return the clone
    return $clone;
}

# NOTE:
# cloneShallow will copy _node_key by default
# because it just copies the internal hash by
# deferencing it.

1;

__END__