File Coverage

blib/lib/Tree/Persist/Base.pm

Criterion	Covered	Total	%
statement	67	76	88.1
branch	11	20	55.0
condition	4	8	50.0
subroutine	17	18	94.4
pod	5	5	100.0
total	104	127	81.8

package Tree::Persist::Base;

use strict;
use warnings;

use Scalar::Util qw( blessed );

our $VERSION = '1.12';

# ----------------------------------------------

sub new
{
	my($class) = shift;
	my($self)  = bless {}, $class;

	$self -> _init( @_ );

	return $self;

} # End of new.

# ----------------------------------------------

sub _init
{
	my($self) = shift;
	my($opts) = @_;

	$self->{_tree}       = undef;
	$self->{_autocommit} = (exists $opts->{autocommit} ? $opts->{autocommit} : 1);
	$self->{_changes}    = [];

	if ( exists $opts->{class} )
	{
		$self->{_class} = $opts->{class};
	}
	else
	{
		$self->{_class} = 'Tree';
	}

	if ( exists $opts->{tree} )
	{
		$self -> _set_tree( $opts->{tree} );
	}

	return $self;

} # End of _init.

# ----------------------------------------------

sub autocommit
{
	my($self) = shift;

	if ( @_ )
	{
		(my $old, $self->{_autocommit}) = ($self->{_autocommit}, (shift && 1) );

		return $old;
	}
	else
	{
		return $self->{_autocommit};
	}

} # End of autocommit.

# ----------------------------------------------

sub rollback
{
	my($self) = shift;

	if ( @{$self->{_changes} } )
	{
		$self -> _reload;

		$self->{_changes} = [];
	}

	return $self;

} # End of rollback.

# ----------------------------------------------

sub commit
{
	my($self) = shift;

	if ( @{$self->{_changes} } )
	{
		$self -> _commit;

		$self->{_changes} = [];
	}

	return $self;

} # End of commit.

# ----------------------------------------------

sub tree
{
	my($self) = shift;

	return $self->{_tree};

} # End of tree.

# ----------------------------------------------

sub _set_tree
{
	my($self)  = shift;
	my($value) = @_;

	$self->{_tree} = $value;

	$self->_install_handlers;

	return $self;

} # End of _set_tree.

# ----------------------------------------------

sub _install_handlers
{
	my($self) = shift;

	$self->{_tree} -> add_event_handler
	({
		add_child	 => $self -> _add_child_handler,
		remove_child => $self -> _remove_child_handler,
		value		 => $self -> _value_handler,
	});

	return $self;

} # End of _install_handlers.

# ----------------------------------------------

sub _strip_options
{
	my($self)   = shift;
	my($params) = @_;

	if ( @$params && ! blessed($params->[0]) && ref($params->[0]) eq 'HASH' )
	{
		return shift @$params;
	}
	else
	{
		return {};
	}

} # End of _strip_options.

# ----------------------------------------------

sub _add_child_handler
{
	my($self) = shift;

	return sub
	{
		my($parent, @children) = @_;
		my($options)           = $self -> _strip_options( \@children );

		push @{$self->{_changes} },
		{
			action   => 'add_child',
			children => [ @children ],
			options  => $options,
			parent   => $parent,
		};

		$self -> commit if ($self -> autocommit);
	};

} # End of _add_child_handler.

# ----------------------------------------------

sub _remove_child_handler
{
	my($self) = shift;

	return sub
	{
		my($parent, @children) = @_;
		my($options)           = $self -> _strip_options( \@children );

		push @{$self->{_changes} },
		{
			action   => 'remove_child',
			children => [ @children ],
			options  => $options,
			parent   => $parent,
		};

		$self -> commit if ($self -> autocommit);
	};

} # End of _remove_child_handler.

# ----------------------------------------------

sub _value_handler
{
	my($self) = shift;

	return sub
	{
		my($node, $old, $new) = @_;

		push @{$self->{_changes} },
		{
			action    => 'change_value',
			new_value => $node->value,
			node      => $node,
			old_value => $old,
		};

		$self -> commit if ($self -> autocommit);
	};

} # End of _value_handler.

# ----------------------------------------------

1;

__END__