File Coverage

blib/lib/Treex/PML/Factory.pm

Criterion	Covered	Total	%
statement	23	42	54.7
branch	0	12	0.0
condition	0	5	0.0
subroutine	9	15	60.0
pod	5	5	100.0
total	37	79	46.8

package Treex::PML::Factory;

use 5.008;
use strict;
use warnings;

use vars qw($VERSION);
BEGIN {
  $VERSION='2.21'; # version template
}
use Carp;
use UNIVERSAL::DOES;

my $default_factory;

sub DOES {
  my ($self,$role)=@_;
  if ($role eq __PACKAGE__) {
    # we don't implement Treex::PML::Factory interface, but anything derived from use is assumed to do so
    return ref($role) eq __PACKAGE__ ? 0 : 1;
  } else {
    return $self->DOES($role);
  }
}

sub new {
  my $class = shift;
  return bless {@_}, $class;
}

sub make_default {
  my $obj = shift;
  my $class = ref($obj) || $obj;

  die __PACKAGE__." is not a proper factory and cannot be made default!\n"
    if $class eq __PACKAGE__;

  my $prev = Treex::PML::Factory->get_default_factory;
  unless ((ref($prev)||'') eq $class) {
    Treex::PML::Factory->set_default_factory(ref($obj) ? $obj : $class->new(@_));
  }
  return $prev;
}

sub set_default_factory {
  my ($self,$factory)=@_;
  die __PACKAGE__."->set_default_factory: argument must implement ".__PACKAGE__."!"
    unless UNIVERSAL::DOES::does($factory,__PACKAGE__);
  $default_factory = $factory;
}

sub get_default_factory {
  return $default_factory;
}

BEGIN {
  no strict 'refs';
  for my $method (qw(
		      createPMLSchema createPMLInstance
		      createDocument createDocumentFromFile
		      createFSFormat
		      createNode createTypedNode createList createSeq
		      createAlt createContainer createStructure
		   )) {
    *$method = sub { shift; $default_factory->$method(@_) }
  }
}

1;
__END__